| Names | |
|---|---|
| Preferred IUPAC name | 1-methyl-4-oxo-1,4-dihydro-3H-pyrazol-3-yl]benzenesulfonic acid |
| Other names | Metol 4-Methyl-1-phenyl-3-pyrazolidone 4-Methyl-1-phenyl-3-pyrazolone Elon |
| Pronunciation | /wan-θri-sʌl.foʊˈfiːnɪl-θri-mɛθ.əl-faɪ-pɪˈræz.əˌloʊn/ |
| Identifiers | |
| CAS Number | 89-25-8 |
| 3D model (JSmol) | `/9j/1HYI6OvwEAAIAAAAJAAAABAAAAAEAAAAXAAAAMAAAACAAAAwAAAP...` |
| Beilstein Reference | 120926 |
| ChEBI | CHEBI:86478 |
| ChEMBL | CHEMBL332644 |
| ChemSpider | 5464247 |
| DrugBank | DB09439 |
| ECHA InfoCard | 03c1e668-01cf-4d90-b595-87d4e7c2c181 |
| EC Number | 4.1.3.48 |
| Gmelin Reference | 145158 |
| KEGG | C05614 |
| MeSH | D019473 |
| PubChem CID | 72215 |
| RTECS number | DJ1050000 |
| UNII | X4WEAM939T |
| UN number | UN2811 |
| CompTox Dashboard (EPA) | DTXSID8020705 |
| Properties | |
| Chemical formula | C10H9N2O4S |
| Molar mass | 273.28 g/mol |
| Appearance | Yellow powder |
| Odor | Odorless |
| Density | 1.347 g/cm³ |
| Solubility in water | soluble |
| log P | -0.45 |
| Acidity (pKa) | 9.97 |
| Basicity (pKb) | 11.95 |
| Magnetic susceptibility (χ) | -66.9 × 10⁻⁶ cm³/mol |
| Refractive index (nD) | 1.637 |
| Dipole moment | 6.49 Debye |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 274.0 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | -556.8 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -1405.8 kJ/mol |
| Pharmacology | |
| ATC code | N02BB72 |
| Hazards | |
| Main hazards | H315, H319, H335 |
| GHS labelling | GHS07, GHS09 |
| Pictograms | GHS07 |
| Signal word | Warning |
| Hazard statements | H302, H319 |
| Precautionary statements | P261, P264, P271, P272, P280, P302+P352, P333+P313, P363, P501 |
| Autoignition temperature | 400°C |
| Lethal dose or concentration | LD50 Rat oral: > 2000 mg/kg |
| LD50 (median dose) | LD50 (median dose): Rat oral 1,800 mg/kg |
| NIOSH | RN 118-47-8 |
| PEL (Permissible) | Not established |
| REL (Recommended) | 0.2 mg/m³ |
| IDLH (Immediate danger) | Not established |
| Related compounds | |
| Related compounds | 5-Methylphenazone Edaravone Morniflumate |
| Property | Details | Manufacturer Commentary |
|---|---|---|
| Product Name & IUPAC Name | 1-(3-sulfophenyl)-3-methyl-5-pyrazolone IUPAC: 1-(3-sulfophenyl)-3-methyl-2,4-dioxopyrazolidine-5 |
Naming reflects the functional groups that matter for manufacturing and technical handling. The position of the sulfo group on the phenyl ring determines water solubility and suitability for downstream dye, pigment, or analytical reagent synthesis. Naming jargon aligns internally with order entry and batch tracking, and typically matches CAS documentation for regulatory and customs records. |
| Chemical Formula | C10H10N2O4S | The empirical formula supports mass balance calculations for synthesis and in-process controls. Tracking elemental composition is essential during quality assurance for batch verification and raw material reconciliation. Formula checks against spectral analysis, confirming the completion of sulfonation and methylation steps in route selection. |
| Synonyms & Trade Names | Metol Sulfone; 3-Methyl-1-(3-sulfophenyl)-5-pyrazolone; MSPP | Synonyms reflect commercial practice and differences in international naming conventions. Shipping documentation and procurement contracts often cite both systematic and trade names. Internal lot labelling prefers systematized terms while MSDS and customs filings rely on officially recognized synonyms. |
| HS Code & Customs Classification | 2933.19 | The customs code depends on structural motifs recognized by international harmonized systems. Regulatory and logistics teams classify this product as a nitrogen heterocyclic compound with sulfonic acid substitutions. Specific HS classification ensures compliance with export regulations and is confirmed for each production batch to support customs clearance and import/export declarations. |
1-(3-sulfophenyl)-3-methyl-5-pyrazolone is supplied as a crystalline solid with a tendency to cake at higher humidity, especially in technical grades lacking anti-caking agents. Color ranges from off-white to yellowish, strongly influenced by both grade purity and trace colored by-products from synthesis. Minimal odor expected; any significant smell often points to degradation or improper drying.
Melting point varies by residual salt and hydration level—typical product supplied for industrial dye synthesis undergoes testing for melting range as a basic quality screen, but close temperature control is required during downstream melting or redissolution. Boiling point does not define handling as it decomposes before boiling under atmospheric conditions. Density measurements are grade-dependent, with higher-purity samples presenting slightly greater bulk density owing to lower residual inorganic content.
Material remains chemically stable within the neutral-to-acidic pH window, but sulfonic acid groups promote hygroscopicity. Contact with strong oxidizers, alkaline substances, or prolonged UV exposure can trigger color changes and decomposition, generating colored impurities and lowering performance in downstream dye reactions.
Solubility depends on both sodium salt content and hydration status—pure samples dissolve readily in water; partial neutralization or contaminated batches result in cloudy or gel-forming solutions, impairing reproducibility in analytical or synthesis uses. For highly controlled applications, pre-filtration of solutions removes undissolved particulates linked to batch-to-batch process variables and transportation humidity.
| Property | High Purity Grade | Technical Grade |
|---|---|---|
| Assay (HPLC or Titration) | Defined per customer or standard requirements | Typical minimums, lower than high-purity |
| Colorimetric Purity | Lower color value (less coloration) | May allow higher coloration |
| Sulfonate Content | Closer to theoretical | May be below theoretical due to incomplete sulfonation |
| Moisture | Typically lower, after controlled final drying | Higher tolerance for retained moisture |
| Inorganic Impurities | Well controlled and lower | Can include higher levels of sodium sulfate/chloride |
Profile varies across processes and feedstocks. Main impurities stem from incomplete sulfonation, over-oxidation residues, and unreacted aromatic precursors. Residual salts originate from neutralizing agents. Higher specification products require additional purification to limit colored by-products and iron contamination, as needed for analytical uses or intermediates for further synthesis.
Release testing uses HPLC, titration, UV/Vis colorimetry, and gravimetric analysis for moisture and sulfonate determination. Internal standards are based on customer contract or sector norms rather than a single universal guideline—routine use of validated in-house or reference laboratory procedures ensures consistency.
Core inputs include sulfanilic acid or equivalent aromatic sulfonic acid for the aromatic component, methylhydrazine or methylhydrazone source, and the appropriate pyrazolone structural precursor. Raw material evaluation focuses on low levels of colored organic impurities and minimal trace metal contamination. Sourcing favors regional suppliers capable of consistent bulk tonnage delivery within agreed impurity windows.
Process employs condensation and sulfonation, with strict control of acid strength and temperature. Sulfonation can use fuming sulfuric acid or chlorosulfonic acid, each producing slightly different impurity spectra. Reaction kinetics require adjustment of agitation and addition rates to limit local hot spots or runaway reactions—early process steps maximize conversion before purification and isolation.
In-line pH and temperature monitoring frame the main control strategy. Crude product receives hot filtration or re-crystallization for high-purity grades, while technical material passes through simpler solid-liquid separation. Iron-scavenging and fine filtration minimize risk of discoloration in finished goods. Final drying regime sets moisture within allowed range, specialty drying applies for low-moisture specifications.
Every batch—regardless of grade—faces comprehensive release based on internal criteria. Sampling for mixing homogeneity, color, moisture, and key inorganics occurs prior to final packaging. Deviations trigger batch review or targeted remediation. Reference standards are recalibrated at regular intervals based on customer feedback and performance reports.
Core molecule participates in azo coupling, oxidative transformation, and further sulfonation. Reaction with diazonium salts forms azo dyes; conditions shift product profile by controlling pH, reactant ratios, and catalyst presence. Other downstream chemical functionalization forms intermediates for specialty colorants or pharmaceutical intermediates.
Reaction design often selects sodium acetate or similar buffers, uses aqueous or biphasic organic solvents, and maintains moderate temperatures. Catalysts influence isomer distribution, while lower temperatures favor purer, less colored product formation. Higher yields require careful exclusion of oxygen and minimization of side reactions, especially for pharmaceutical applications.
Downstream users apply the pyrazolone core toward high-performance azo pigments, metal chelates, and specialty dyes. Modifications target selectivity for different chromophores or introduce solubilizing groups specific to end-use markets such as textile, inkjet, or food dye intermediates.
Long-term storage uses sealed polyethylene or lined fiber drums, with desiccants for low-moisture grades. Controlled temperature avoids melting or caking; elevated humidity or condensation causes lumping and may degrade color quality. Direct sunlight or excessive UV accelerates yellowing; shipments use opaque packaging to minimize light exposure.
Material avoids contact with unlined steel or reactive metals—plastic or glass preferred. Shelf life depends on grade and packaging; high-purity, low-moisture batches in protective packaging last several years under recommended conditions. Clumping, increased odor, or development of brown tints indicate degradation or partial hydrolysis.
Safety documentation reflects the sulfonated aromatic class. Harmful if ingested in significant quantities or exposed in dust form; eye and skin irritant, especially for technical grade containing residual acids or salts. Dust generation controlled in production through local extraction.
Available toxicology indicates limited acute toxicity via oral and dermal routes; product does not meet criteria for severe hazard but should be treated with usual industrial hygiene safeguards. Handling requires eye protection, gloves, and dust masks for bulk material; washing after use prevents dermal irritation. No established occupational exposure limit—limit exposure through engineering controls rather than reliance on PPE alone. Spills cleaned with water and collected for controlled disposal; avoid direct discharge to surface waters due to potential aquatic toxicity.
Production scales for 1-(3-sulfophenyl)-3-methyl-5-pyrazolone depend strongly on order frequency, plant shift utilization, and grade designation. High-purity grades for pharmaceutical or diagnostic markets get scheduled differently than standard industrial or intermediate grades. Continuous process lines prioritize batch consistency, but campaign-based schedules ensure contamination control between grades. Downtime between material changeovers must be factored into availability commitments. In normal plant conditions, disruptions most often stem from upstream sulfonation capacity or specialty pyrazolone ring precursor supply. Unplanned maintenance and raw material allocation across different product lines may impact short-term capacity.
Standard production lead time for regularly scheduled grades falls within an eight to twelve week window after order confirmation, subject to precursor availability and current production queue. Specialty purities or unique particle size distributions demand longer lead times due to specialized work-up or additional analytical verification. Minimum order quantities are determined based on reactor fill volume, demand for grade-specific certification, and economic batch size. For bulk industrial grades, MOQs reflect continuous reactor output, while for high-purity grades, the limiting factor is campaign size and compliance with contamination control protocols.
Packaging selections cover fiber drums, PE-lined steel drums, or multi-layer bags for bulk grades, while sensitive or customer-specified purities may require double-sealed inner liners, nitrogen-blanketed units, or traceable packaging lots. All packaging operations apply in-process checks for seal integrity and contamination. Some export markets enforce compliance with specific transportation or food-contact regulations; custom packaging is quoted upon request based on regional compliance.
Standard shipping terms include FCA production facility, with most customers arranging their own logistics. For regulated markets, overland ADR/RID-compliant carriers handle bulk lots. Payment terms reflect purchaser’s credit rating, order history, and third-party audit status. Advance payment terms apply for first orders or for markets with high currency risk. Letters of credit are mandatory for certain economies, particularly where currency controls or regulatory uncertainties exist.
Core cost drivers include specific sulfonation reagents, methylpyrazolone intermediates, and energy demand for isolation/purification. Market volatility for benzene or sulfonating reagents transmits directly to finished product cost. Utility costs—especially steam, electricity, and water for work-up—shift seasonally. Labor and regulatory overheads for batch documentation or high-purity lots further differentiate price bands.
Rapid changes often track with disruptions in global aromatic feedstock supply, policy updates on hazardous reagents, or new safety/environmental mandates affecting by-product containment. Temporary price spikes follow upstream shortages or capacity constraints in the main aromatic intermediates market. Long-term movements depend on shifts in large regional users shifting processes (Western vs. Asian demand), and energy/oil market developments that impact all downstream aromatics chemistry.
Grade, purity, and packaging certification dictate price differences. High-purity grades for pharma/diagnostic processing require additional purification and analytical validation, translating to higher unit costs. Packaging certified for food/pharma, or export, involves incremental costs for labeling, traceability, and compliance. Industrial grades fill large containers; specialty applications utilize small, validated lots with stringent traceability, pulling prices higher on a per kilogram basis.
Steady long-term growth characterizes demand for 1-(3-sulfophenyl)-3-methyl-5-pyrazolone, driven by established consumption in colorant, diagnostic, and specialty chemical routes. The supplier base concentrates in East Asia and selected EU facilities with long-standing process know-how. Regional overcapacity exists in basic grades, but specialty and pharma-validated material remain tight, especially during regulatory audit cycles or precursor shortages. Seasonal demand spikes follow procurement cycles of large buyers in diagnostic reagents and pigment intermediates.
US/EU: Stringent regulatory frameworks and compliance drive higher demand for documented grades, with accredited supply chain traceability. Spot shortages occur during major plant audits or regulatory enforcement waves. Intermediate and technical grades face price pressure from imports, while high-grade/validated material is still procured locally wherever possible.
JP: Consistent quality and long-term supplier relationships determine market share. Japanese clients prioritize documented impurity profiles and batch-to-batch reproducibility.
IN/CN: Major capacity additions in these geographies allow cost-competitive basic/intermediate grades. Increasing focus on compliance and traceability in India and China is observable in larger-volume clients; however, grey market/off-spec issues persist for buyers prioritizing only price.
Data from the past 36 months indicates continued volatility in global aromatic intermediates. For 2026, steady demand for compliant, high-purity grades will sustain or lift prices moderately, especially if environmental or export policy triggers cost inflation in East Asia. Market consensus expects no significant new capacity except for one planned expansion in southern China; if realized, this could relieve price pressure for technical grades but not impact high-purity grade pricing. Exchange rate shifts, especially for RMB and INR, could translate to 5–10% swings in landed cost across major markets.
Analysis synthesizes internal production cost data, raw material market reports, industry association bulletins, and live customer order flow. Price trend predictions derive from contracts in place, historical production campaign yields, and regional energy pricing benchmarks. Spot market observations are confirmed with internal sales order audits and recent supplier peer feedback.
Notable recent developments include tightening of process effluent limits for sulfonation in Eastern China, resulting in selective process modification and temporary shutdowns. Recovery from supply chain shocks attributed to upstream aromatic feedstock interruptions remains incomplete in some sectors, increasing dependence on multi-region sourcing for key grades.
Regular updates to EU REACH and comparable US/EPA guidelines dictate continued auditing and re-submission of impurity and packaging documentation. Suppliers aligning with new requirements adopted enhanced in-line process monitoring, revised release criteria, and additional QA personnel training—directly impacting lead time and compliance costs. For export to Japan, current guidelines raise expectations for analytical documentation and on-site audit compatibility, demanding uninterrupted electronic batch records and impurity profiling.
From a production and technical standpoint, flexible batch planning and dual-source approval for core precursors have improved supply security against short-term disruptions. Process teams introduced PAC (process analytical control) units to flag early deviations in sulfonation or ring closure steps, reducing risk of batch rejection. Cross-referencing supplier audit feedback and internal tracking of legal changes allowed rapid adaptation in documentation and packaging compliance, minimizing customer impact during regulatory transitions.
1-(3-sulfophenyl)-3-methyl-5-pyrazolone plays a crucial role in several sectors where chelation, coupling, or chromogenic properties align with technical product needs. Main applications include:
| Grade | Typical End-Use | Key Considerations |
|---|---|---|
| Analytical Reagent Grade | Laboratory assays, clinical testing, trace metal analysis | Prioritized for lowest background contaminants, high batch reproducibility, certified impurity levels upon request |
| Industrial/Technical Grade | Bulk manufacturing of pigments, routine chemical synthesis | Purity and impurity tolerances adjusted to process demands, cost-managed for high volume, stability for storage |
| Custom/Pharma Grade | API intermediate, R&D synthesis for pharmaceuticals | Requires tailored process route, controlled trace and organic impurity profile, supplied with accompanying documentation upon client specification |
In production, the degree of purity, trace metal background, and organic impurity content typically define grade selection. Analytical reagent users often request additional documentation for trace element certification. In pigment synthesis, color stability, solubility, and ease of integration with other reactants drive demand for technical grades with enhanced flow and handling characteristics. For pharmaceutical or high-value synthesis, batchability, repeatability, and documented absence of specified organics/metals weigh heaviest, sometimes requiring adaptations to the purification train or raw material sourcing.
Selection starts with a clear understanding of the final application. The required technical characteristics, such as color development or sensitivity to trace metals, guide the initial filtering of suitable grades before considering secondary parameters like physical form or flowability.
Check for sector-specific standards, especially for health, diagnostics, and export-regulated industries. Regulatory compliance often extends beyond the main certificate of analysis to include documentation of origin, process traceability, and guarantees concerning banned/controlled substances.
Purity and impurity requirements do not remain consistent across all applications. Analytical grades often demand detailed trace metal screening and background signal verification upon customer request. Technical grades may accept broader contaminant windows if justified by process engineering or economics. Pharmaceutical and R&D uses trigger the strictest internal release procedures, including multi-stage post-synthesis purification and deeper archival of batch records.
End use volume and cost implications typically influence the choice of scale, packaging, and the level of quality controls implemented during manufacture. Bulk technical grade often receives more streamlined processing and packaging, while smaller-lot analytical or pharma grades are batch-segregated, handled under tighter environmental controls, and subject to additional qualification.
The final confirmation comes through sample validation. End users with unique performance or regulatory needs customarily undertake their own verification, working with our technical department to review batch history, impurity spectra, and application-specific performance results—aligning supply precisely with market and technical needs.
Quality management systems anchor every batch from raw materials to finished goods. Our manufacturing facility maintains internationally recognized quality certifications verified by third-party audits with regular surveillance cycles. These certifications cover change control, traceability, deviation management, and supplier qualification. Certification documents are updated and available for regulatory and corporate audits on request.
Lot-to-lot consistency and impurity marker control stem from in-house validated methods and customer-specific protocols. Where customer or regulatory bodies mandate, product-specific certificates such as halal, kosher, or compliance with regional chemical regulations can be provided if the synthesis route, raw material origin, and segregation logic support the claim. All documentation supports application in regulated sectors such as food colorants and intermediates only if applicable to the particular grade.
Every shipment comes with batch analytical data, certificate of analysis detailing assay, key impurity thresholds per customer agreement, and, where requested, additional technical data. Change notifications follow any substantial variation in process route or specifications. Regulatory dossiers support restricted applications; dossiers are tailored to the actual process and the specific target market. We maintain an archive of all batch and process records for traceability.
Core production lines are dedicated to this compound, selected based on campaign planning and forecasted commitments. Scheduling allows coverage for regular and urgent orders without risking batch contamination between grades. Customers requiring custom specifications or logistical adjustments discuss directly with production and logistics teams. Options include fixed supply agreements, long-term scheduling, and spot contracts for projects with fluctuating demand.
Production slots and raw material procurement plans are balanced against contracted volumes. Any changes in upstream material quality or availability prompt risk assessments to prevent downstream supply interruptions. Consistency is prioritized by sticking to preferred process routes and supplier pools with proven lot histories. Backup production lines can be activated for validated grades to minimize downtime during maintenance or audits.
Customers initiate sample requests through a documented process, specifying intended use, required documentation, and preferred test quantities. Technical teams assess application fit and allocate from control batches or pilot lots matching the described process route. Analytical support accompanies supplied samples, including method suitability statements where available. Feedback channels ensure customer trials align with anticipated industrial-scale performance.
Cooperation models are built around production realities and customer needs. Options include minimum order quantities for campaign efficiency, consignment stock at customer facilities, VMI (Vendor Managed Inventory) where logistics or regulatory issues require proximate supply control, and split-batch shipments to streamline formulation pipeline integration. Terms are established during onboarding based on open risk and demand communication, with regular performance reviews for process or volume reassessment.
Process engineers in our facility continually test routes that improve conversion efficiency while reducing by-product loads. Focus remains on minimizing sulfonation side reactions and optimizing pyrazolone ring formation. Customer R&D groups have shown growing demand for higher-purity forms, especially grades designed for analytical reagents or dye intermediates. Research teams examine the stability of the sulfonic group under storage and processing, since hydrolysis or oxidative degradation impacts performance in sensitive downstream syntheses. Analytical chemists work on improving impurity profiles, particularly where batch consistency or trace-metal reduction is critical to final application.
Production management has observed increased inquiries from manufacturers of specialty dyes and fine chemical intermediates. In water treatment applications and diagnostics, end-users specify tighter process windows to prevent residue carryover. Demand also appears in electronics and imaging sectors that require modifications to the aromatic sulfonate group for functional material synthesis. For each emerging segment, typical specifications vary by region and customer IP, as downstream reactivity and finished material quality hinge directly on precursor purity and batch reproducibility.
Consistent removal of colored impurities and control of residual inorganic salts present operational challenges, especially across differing raw material sources. The production team finds that choice of sulfonation agent and temperature ramp profiles directly impact product color and downstream filterability. Where specification for heavy metals is a concern, in-line monitoring and dedicated purification sequences are integrated, though actual levels are tailored per customer acceptance criteria. In recent years, plant-side automation and feedback-adjusted pH control during work-up delivered observable gains in yield and decrease in lot-to-lot variation.
Based on regular supply chain demand tracking, steady growth is expected in the Asia-Pacific and North American regions, with downstream users targeting process expansions for intermediates in colorants, water-soluble dyes, and reagent kits. Expansion narratives are closely linked to innovations in fine chemicals and increased regulatory scrutiny on azo intermediates, pushing the call for cleaner, narrow-spec grades. Customers are likely to prioritize reliable access to multi-tonnage lots produced under consistent batch-release protocols and traceable supply chain management.
Newer synthesis pathways gain traction where waste minimization or energy usage reductions matter for cost and compliance. Ongoing improvements in catalyst recovery and solvent recycling matter more as environmental expectations rise. Plant engineering trials different crystallization agents to allow for lower temperature isolation steps, which can affect filter cake morphology and residual solvent traces. Product line extensions focus on customization, allowing adaptation at the level of residual salt profile, particle size, and water content depending on downstream use-case and formulation compatibility.
Full-lifecycle waste tracking and solvent recovery benchmarks influence the adoption of newer process routes. Efforts now align toward using renewable feedstocks where feasible, and investment in closed water systems lessens freshwater burden. Technological trials shift toward sulfonation agents that offer a safer handling profile and generate fewer hazardous residues. Post-process, waste streams undergo separation and neutralization steps, with by-product salt recovery tied into site-level sustainability reporting.
Our technical support group handles queries on raw material compatibility, optimal dissolution protocols, and reactivity in multi-step syntheses. For new customers or novel applications, support chemists interpret analytical data and provide recommendations on grade selection based on end-use performance, with direct feedback from the plant’s analytical lab for clarification.
Process and application engineers coordinate with customer process leads to troubleshoot issues such as unusual color development, filtration hurdles, or crystallization inconsistencies during scale-up. Where customers require application-specific adjustment—such as tighter ash or moisture content—pilot-scale batches can be produced with modified process controls. Feedback loops between our QC and customer analytical teams support ongoing application improvements.
After each delivery, quality documentation includes representative batch data, release criteria, and any custom-agreed specification notes. Technical follow-ups ensure that on-site handling, storage conditions, and formulation integration proceed as per plan, especially where process changeover or alternate origin batches are in use. If deviation issues emerge, our technical team works in real time with customer QC labs to isolate root causes, whether linked to raw material changes, plant-side parameter drift, or external supply chain disruptions.
As a direct producer of 1-(3-sulfophenyl)-3-methyl-5-pyrazolone, our factory maintains strict control over every stage of this compound’s manufacture, from raw material sourcing through final quality checks. Each batch meets defined purity and performance targets, which supports consistent integration into a wide range of industrial processes.
Demand for 1-(3-sulfophenyl)-3-methyl-5-pyrazolone remains steady, driven by its use as a complexing agent and intermediate in the colorant and analytical industries. Dye manufacturers and analytical reagent suppliers rely on this molecule to ensure efficient metal ion detection, formulation of water-soluble dyes, and production of stable pigments. A slight deviation in chemical profile can impact downstream results, reinforcing the importance of consistency in every lot we deliver.
In-house process analytics verify content, appearance, particle size, and sulfonation degree during all critical steps. Regular batch-to-batch comparison, documented through our process control system, ensures each delivery aligns with prior shipments. When customers scale processes or adapt to new regulatory requirements, our technical staff applies years of synthesis and purification experience to resolve deviations quickly.
Bulk buyers often specify robust packaging formats to streamline integration with automated systems. Drum, bag, and custom intermediate bulk container options help match operational needs and storage constraints. Orders range from a single pallet to regular multi-ton shipments. As a manufacturer, our logistics team schedules deliveries on fixed timelines, supporting just-in-time production models without introducing unnecessary handling steps or transfer risk.
Complex industrial processes may pose questions about compatibility or solubility in new applications. Our technical department, located onsite, supports direct engagement with industrial engineers, formulators, and QA leads. By sharing insights from years of hands-on pyrazolone chemistry, we clarify technical questions quickly and recommend practical adjustments if needed. This level of access to process chemists helps partners reduce troubleshooting time and maintain compliance with evolving standards.
Direct sourcing from a primary producer allows business customers to streamline procurement channels and reduce hidden costs. Detailed production records, integrated documentation, and rapid response throughout the supply cycle translate to predictable lead times and lower risk in inventory planning. Manufacturers and distributors leverage secure supply, backed by our ongoing investment in process scaleability, which helps them protect their own downstream production from variability or transport-related disruption.
| Production Control | Application Expertise | Supply Chain Integration |
|---|---|---|
| Onsite synthesis and QA, batch traceability, purity confirmation | Colorant, analytical reagent, and pigment applications backed by technical support | Drum, IBC, and custom packing, scheduled and secure freight procedures |
Over years of manufacturing 1-(3-sulfophenyl)-3-methyl-5-pyrazolone in bulk, small variations show up based on process control, equipment, and raw material consistency. We pay close attention to these details, because even minor changes influence the physical and chemical properties that drive quality and performance in end-use applications.
Solubility forms the starting point for most downstream formulations. Our batches dissolve readily in water, giving a clear, stable solution at ambient temperatures. This product does not dissolve well in most organic solvents such as acetone, ether, or chloroform, which limits cross-contamination risks during handling. That water solubility is particularly attractive for textile dyes, diagnostic reagents, and related water-based systems. We take special care to maintain high purity and control residual salts, which help customers avoid solubility problems during processing. All production runs are checked for clarity and complete dissolution in water to support predictable, efficient blending.
It is important to avoid excessive concentrations since highly supersaturated solutions tend to crystallize out under cooler or stagnant storage. Agitation and moderate temperatures keep this process smooth, especially for customers preparing large-scale liquid stock solutions.
Direct experience in large-scale synthesis shows batch quality impacts melting behavior. Our process achieves a consistent crystalline form, which melts at approximately 300°C with decomposition. Such high thermal stability enables its use in high-temperature processing, like pigment preparation or in diagnostic test manufacture where thermal exposure is routine. Keeping strict control of moisture and impurity profiles supports reproducible melting. Customers requiring granulation or milling also benefit from this thermal resilience since it tolerates mechanical shear and localized heat without degradation.
Our technical team has examined stability under a range of storage and usage conditions. 1-(3-sulfophenyl)-3-methyl-5-pyrazolone remains stable under standard ambient warehouse conditions provided it is kept tightly sealed, away from excessive humidity. Exposure to highly acidic or basic media causes degradation, so we advise blending at neutral to slightly acidic pH. Direct sunlight or UV can cause yellowing and reduced activity over time. We store finished product in light-resistant containers and nitrogen-flushed liners for clients with sensitive applications.
Thermal cycling, particularly repeated heating above 100°C, does not normally impact structure unless impurities or high moisture are present. Our packaging standards include sealed drums or foil-lined bags to cut down moisture transfer from ambient air, which can otherwise promote slow hydrolysis in humid storage.
Handling and integration of 1-(3-sulfophenyl)-3-methyl-5-pyrazolone in downstream applications require clear guidelines. Based on factory trials and feedback from long-term partners, we supply detailed technical bulletins and application guidance suited for industrial or laboratory use. Our technical team supports custom solutions for challenging process conditions, such as concentrated liquid handling or compatibility with specific reagents. Where stability, purity, or particle size needs special tailoring, we consult directly with R&D departments to adjust our process or recommend appropriate storage and handling protocols.
Robust process control, traceable batch records, and continuous feedback from users enable our production to meet stringent standards. Customers can count on consistency and transparency from our factory to their facilities, with laboratory validation and direct technical support from our manufacturing site.
Operators on our plant floor fill orders for 1-(3-sulfophenyl)-3-methyl-5-pyrazolone every day, and we see first-hand how packaging requirements have shifted over the years. Most of our customers in colorant manufacturing, testing labs, and related research want multiple options. Practicality and transport safety drive our standard offerings. Small laboratories tend to rely on our 100-gram or 500-gram bottles for controlled applications, while scaled production facilities receive 5-kilogram or 25-kilogram fiber drums for routine consumption. Our shipping department can fill intermediate sizes and double-lined PE or composite drums for larger, safer shipments whenever required by customer intent or regulatory considerations. Production line schedules flex each week to match demand. Large, lined containers eliminate the need for multiple small packages, reducing handling, loss, and labor at the receiving end. We pack only after each batch passes our established QA checks.
Consistency remains central in specialty chemical manufacturing. Every production batch of 1-(3-sulfophenyl)-3-methyl-5-pyrazolone is analyzed in-house on modern chromatographic systems. Our standard purity sits above 98% for most technical and industrial applications. If a project calls for higher levels—for example, a sensitivity-critical analytical process—we routinely reach above 99% by running multiple crystallizations and making extra process control adjustments. Our chemists document every result, and we keep archival samples for all deliveries. We can provide detailed batch data, including GC, HPLC, or UV-vis reports, whenever customers require supporting evidence. Over years of plant operation, we've learned where impurities commonly arise, and we engineer them out at the earliest possible stage rather than dealing with problems post-synthesis. This saves production reruns and unnecessary waste for everyone involved.
Bulk procurement receives our best technical attention and logistical support. Our commercial policy recognizes the economies of scale built into multi-ton or multi-drum shipments. Raw material procurement, energy load, and labor allocation all benefit from higher-volume runs, which lowers total processed cost per kilogram. Our commercial team can structure progressive pricing for regular, large-scale business partners and project-based bulk deliveries. Discounts grow with quantity on confirmed purchase forecasts, either through standing yearly contracts or on a project-by-project basis. Prompt planning and long-term scheduling with key accounts help us maintain stable production, benefit our supply chain, and provide savings directly back to our customers. You need reliable, continuous material flow—we can lock in capacity as soon as technical and commercial teams finalize volumes and schedules.
We have handled orders for regional customers with unique packaging requests, labeling languages, and export paperwork. Our documentation team matches SDS and COA paperwork to the exact lot, and we ship under the relevant codes required by regulations. If a customer requests a dedicated purity, non-standard pack, or custom labeling, our technical and commercial managers work together to adjust production batches, QA steps, and packing operations to deliver as requested, provided the operational plan remains safe for both plant staff and end users. We deal directly, avoiding unnecessary intermediaries, and share complete, audited batch data with each delivery. Customers gain transparency and build confidence that every container comes from the factory they trust, with quality and support to back it up.
Our facility produces 1-(3-sulfophenyl)-3-methyl-5-pyrazolone in high volumes for demands in the analytical, colorant, and specialty chemical sectors. Experience in international logistics keeps us sharp on compliance, and we take a practical approach to chemical stewardship.
From our end, proper documentation runs parallel with appropriate handling. Customs delays and regulatory barriers become less of a headache when UN numbers, CAS numbers, and all required transport classifications travel with the shipment. This compound, based on our review of the current harmonized international codes and chemicals lists—particularly the UN Recommendations on the Transport of Dangerous Goods—does not belong to the most strictly regulated classes for flammability or acute toxicity. Still, freight companies, port authorities, and air carriers have zero-tolerance for incomplete labeling, and even minor clerical errors can halt a whole container. That’s why we always use international shipping marks and seals that stand up to repeated handling and moisture.
1-(3-sulfophenyl)-3-methyl-5-pyrazolone comes out of our process as a stable, crystalline solid or powder. No tendency to polymerize or decompose at ambient temperatures under normal atmospheric conditions. We never cut corners on packaging materials—PE-lined fiber drums, anti-static liners, and tamper-evident closures all protect against accidental moisture absorption and spillage. For sea freight, we almost always recommend drum liners and weather-resistant pallets.
Laboratory testing and shipment audits verify absence of leaks and container failures, and our standard filling lines deploy both dust extraction and overfill controls. We engineer every drum and bag to handle stacking, forklift contact, and standard vibration during transit.
By industry standards, this molecule does not demonstrate rapid degradation from short-term temperature swings. We see no need for refrigerated containers or dry ice. But prolonged exposure to high humidity can still create handling difficulties—caking in bags, compromised measurement accuracy for customers, and added clean-up work at distribution hubs. Our sites operate below 65% relative humidity to prevent this, and we advise the same for interim storage after shipment. Pallets kept off the warehouse floor using treated timber slats achieve best results.
Direct sunlight never helps any organic intermediate. Fading color or inconsistent particle size usually trace back to sloppy warehouse discipline, so we require covered storage and keep our own stocks away from windows and exterior walls.
We always produce and dispatch with approved workplace controls. From loading dock to lab, our team uses gloves, dust masks, and in some cases eye protection. No evidence from our records suggests that this compound poses acute inhalation or contact hazards on par with many acid chlorides or isocyanates, but industry codes take the “better safe than sorry” approach.
Emergency response instructions always ship with our cargo. Onboard spill kits and absorption pads in containers meet port facility rules, further minimizing the risk of inadvertent release at transfer points.
Chemicals produced at scale cannot afford variable quality or logistics mistakes. We keep tight feedback loops with transportation partners, update our in-house training, and invite external inspection. Customer audits spur us to refine documentation, update MSDS files, and raise quality of packaging materials. All regulatory paperwork stays ready for review at every stage. Any updates in IATA, IMDG, or ADR regimes filter straight into our logistics SOPs.
Modern manufacturing does not tolerate gamble-playing with shipping rules or storage benchmarks. We apply our years of operational evidence and regulatory research with care, so customers receive reliable, compliant shipments with full technical backing from start to finish.
For product inquiries, sample requests, quotations or after-sales support, please feel free to contact me directly via sales7@bouling-chem.com, +8615371019725 or WhatsApp: +8615371019725
