Frequently Asked Questions

Common questions about sourcing, compliance and documentation across our product range.

What is the difference between C5/C9 and C9 petroleum resin?+

C5/C9 copolymer petroleum resins combine aliphatic and aromatic feedstocks and are selected for a balance of colour, compatibility, adhesion and softening point. C9 aromatic petroleum resins generally offer stronger aromatic compatibility and may have different colour and thermal characteristics. Performance varies significantly by grade, hydrogenation level and application, so supplier data and formulation trials should be compared.

What PA grades does SUNCHEM supply?+

SUNCHEM can source selected PA6 and PA66 grades for injection moulding, extrusion, fibre and other applications. Available viscosity, additive package, reinforcement, colour and packaging depend on the manufacturer and grade. Buyers should provide the processing method and target properties before grade selection.

Are your food additives suitable for EU and US market use?+

Suitability must be confirmed for the exact ingredient, grade, manufacturer, intended use and destination market. SUNCHEM can provide available specifications and supporting documents and can check whether a product is supplied against relevant EU, US FDA, FEMA, FCC or other requirements. Final regulatory approval and permitted use level remain the responsibility of the finished-product manufacturer and importer.

What is Zinc Pyrithione used for?+

Zinc pyrithione is an antimicrobial ingredient used in certain industrial and formulated-product applications. Permitted uses vary significantly by country and product category, and some former cosmetic uses are restricted in certain markets. Buyers must confirm the intended application, local regulatory status and required grade before sourcing.

How long does delivery take for paint and pigment chemicals from China?+

Lead time depends on production availability, quality approval, packaging, dangerous-goods booking, destination and shipping method. SUNCHEM confirms an estimated production and transit schedule for each quotation rather than applying one standard delivery time to all products.

What organic solvents does SUNCHEM supply from China?+

SUNCHEM supplies selected solvents and fine-chemical intermediates, including products used in coatings, adhesives, cleaning, extraction and chemical synthesis. Because the current category includes both true solvents and specialty intermediates, buyers should search by product name or CAS number and confirm specification, hazard class and application requirements.

Are paint and pigment chemicals REACH or RoHS compliant?+

Compliance must be checked for the exact substance, manufacturer, tonnage band, use and destination market. SUNCHEM can request available REACH, RoHS or other regulatory documentation from the selected source, but no category-wide compliance statement should be assumed.

Can you provide COA, SDS and TDS for paint and pigment chemicals?+

COA and SDS are generally available for suitable products, while TDS and additional analytical documents depend on the exact grade and manufacturer. Documentation should be confirmed before order placement, especially where impurity, colour strength, regulatory or application-specific data are critical.

What is HEDP used for in water treatment?+

HEDP is a phosphonate used as a scale and corrosion inhibitor in industrial water systems. It can help control deposits involving calcium salts and metal ions and is used in applications such as cooling-water treatment, boilers and certain cleaning formulations. Performance depends on water chemistry, pH, temperature and the complete treatment program.

Are your hair dye intermediates compliant with EU cosmetics requirements?+

Compliance depends on the exact substance, impurity profile, permitted use, concentration and current destination-market rules. SUNCHEM can provide available specifications and analytical information for evaluation, but the formulator and responsible person must confirm that the finished cosmetic product meets applicable regulations.

What water treatment chemicals does SUNCHEM supply?+

SUNCHEM can supply selected scale and corrosion inhibitors, biocides, disinfectants, coagulants and other water-treatment chemicals, including phosphonates, isocyanurates and selected brominated or non-oxidizing biocides. Availability and permitted use depend on the exact product, application and destination-market regulations.

Are your amino acids food grade or pharmaceutical grade?+

Selected amino acids may be available in food, feed, nutraceutical or pharmaceutical grades. The applicable monograph, assay, microbiological limits, endotoxin requirements and supporting certificates depend on the exact product and manufacturer. Buyers should specify the intended use and required FCC, USP, EP, JP or other standard before quotation.

What types of paint and pigment chemicals does SUNCHEM supply?+

SUNCHEM supplies selected dye and pigment intermediates, aromatic amines, aminophenols, resorcinol derivatives and other specialty chemicals used in coatings, inks, textile dyes and colourant manufacturing. Buyers should provide the exact product or CAS number because end-use suitability and regulatory requirements vary widely.

What documentation is provided with pharmaceutical intermediates?+

Available documentation may include a specification, recent COA, SDS, TDS and selected analytical or impurity information for the exact product and manufacturer. Additional items such as residual-solvent data, elemental-impurity information, REACH status or regulatory support must be confirmed case by case according to the intermediate, manufacturing site and destination market.

Which carbapenem antibiotics are available?+

Carbapenem API availability must be confirmed individually because manufacturing authorization, sterile-processing requirements, patent or market restrictions and regulatory documentation vary by product and destination. Please provide the exact API, grade, quantity and target market for a source review.

Are your APIs sourced from GMP-certified manufacturers?+

GMP status must be verified for the exact API, manufacturing site and destination market. For suitable projects, SUNCHEM can screen manufacturers and provide available GMP certificates, regulatory documents and audit-related information subject to confidentiality and supplier approval. Buyers should complete their own regulatory and quality qualification before commercial use.

What antiretroviral APIs can SUNCHEM source?+

Availability of antiretroviral APIs depends on the product, manufacturing authorization, destination market, regulatory status and current supply conditions. Buyers should provide the INN, required pharmacopoeial standard, quantity, market and dossier requirements so that SUNCHEM can confirm whether an appropriate source is available.

Frequently Asked Questions


SUNCHEM · KNOWLEDGE HUB

Insights for Chemical Sourcing from China

Practical guides, market updates and sourcing strategies for chemical buyers working with Chinese suppliers.

For Chemical Buyers
  • How to evaluate Chinese chemical suppliers
  • Key documents required for chemical import
  • Understanding China price trends and supply cycles
  • Risk control in cross-border chemical procurement

Showing 67 articles

Sourcing Guides

Why Chinese Factory Prices Rise After Your First Order

Low first-order pricing from Chinese chemical factories often hides a pattern. Here's how it works, and why a sourcing partner changes the...

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Silicone Materials for Polymer Modification and Specialty Applications

A practical buyer guide to specifying silanes, siloxanes and silicone oils for polymer modification, from performance properties to sourcing from China.

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Why the Cheapest Chemical Offer Can Create Export Risk

The lowest chemical quote isn't always the cheapest order. See how price-only sourcing can hide documentation gaps, quality issues and export compliance...

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How to Compare Chinese Silane Suppliers Before Placing an Order

How to compare Chinese silane suppliers before placing an order: production capability, specification consistency, testing, export experience and sample strategy.

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AI Data Centers and Chemical Materials: From Cooling to Flame Retardancy

How AI data center growth is driving demand for flame retardants, silicone materials and specialty polymers, and what buyers should check when...

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How to Evaluate Compliance Capability of a Chinese Chemical Supplier

A due-diligence guide to evaluating a Chinese chemical supplier's compliance capability: licensing, documentation accuracy, classification and end-use response.

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Silane Packaging, Storage and Export: What International Buyers Should Know

What international buyers should know about silane packaging, storage and export from China: moisture sensitivity, drum options, DG classification and documentation.

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Importing Organic Solvents from China: Compliance, Packaging and Documentation

A practical guide to importing organic solvents from China: DG classification, packaging formats, SDS/COA documentation and destination checks buyers should confirm.

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Dimethicone Supply from China: Industrial, Cosmetic and Pharmaceutical Considerations

Sourcing dimethicone from China: viscosity grades, key specifications, industrial vs cosmetic vs pharmacopeial documentation, packaging and shipment considerations.

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How to Evaluate Chinese Suppliers for Electronics-Grade Chemicals

A due diligence framework for evaluating Chinese suppliers of electronics-grade chemicals: specialization, batch consistency, COA methods, packaging and red flags.

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Chemical Materials for Advanced Packaging and Electronic Assembly

A buyer-focused map of chemical materials for advanced packaging and electronic assembly: adhesives, solvents, resins, silicones, flame retardants and the documents to...

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Chemical Precursor Sourcing: How Buyers Can Reduce Compliance Risk

How buyers of precursor chemicals can reduce compliance risk: recognizing red flags, preparing end-use documentation and meeting destination import rules.

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Siloxanes and Silicone Intermediates: From Raw Materials to Applications

What siloxanes are, how cyclic intermediates like D4 become silicone polymers such as dimethicone, and quality, regulatory and supplier points for buyers.

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Flame Retardants for Electronics: What Global Buyers Should Know

Flame retardants for electronics explained: phosphorus and brominated types, halogen-free trends, RoHS and REACH points, and sourcing from China.

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Export Compliance for Pharmaceutical Intermediates from China

A compliance-first guide to pharmaceutical intermediates from China: CAS and specs, COA and impurity data, SDS, transport classes and precursor checks.

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Silanes for Rubber and Tire Applications

How silanes work in silica-filled rubber and tire compounds, what to check in TDS and COA, and how to evaluate Chinese silane...

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Specialty Polymers and Additives for Electronics Manufacturing

A buyer guide to specialty polymers and additives for electronics manufacturing: flame retardants, stabilizers, silicone materials and key documentation.

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End-Use Statements for Chemical Sourcing: Why They Matter

What an end-use statement is, why suppliers and authorities request one, what it typically includes, and how to prepare clear information for...

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Silanes for Coatings and Adhesives: Application and Sourcing Notes

How silanes improve adhesion and moisture resistance in coatings and adhesives, with practical notes on specification, sampling and sourcing from China.

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China Semiconductor Materials Supply: Opportunities and Practical Sourcing Risks

An objective look at China semiconductor materials supply: where capability is growing, the practical sourcing risks, and how buyers can validate suppliers.

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Dangerous Goods Chemical Export from China: A Buyer Checklist

A practical buyer checklist for dangerous goods chemical exports from China: DG classification, UN packaging, documentation and freight-mode planning.

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Amino Silanes, Epoxy Silanes and Vinyl Silanes: How to Choose the Right Type

How amino, epoxy and vinyl silanes differ, where each performs best in adhesives, coatings and polymer systems, and what to ask suppliers...

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Wet Electronic Chemicals: What Buyers Should Check Before Importing from China

Importing wet electronic chemicals from China? Check grade definitions, impurity profiles, packaging, labeling and documentation before confirming an order.

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COA, SDS/MSDS and TDS: Essential Documents for Chemical Importers

What COA, SDS/MSDS and TDS documents mean for chemical importers, what to check in each, and when to request sample documents before...

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Silicone Materials Supply from China: What Buyers Should Check

What to check when sourcing silicone oils, siloxanes, intermediates and silanes from China: quality parameters, packaging, storage and supplier qualification.

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Key Electronic Chemicals Used in Semiconductor and PCB Manufacturing

A buyer-focused overview of electronic chemicals for semiconductor and PCB manufacturing: solvents, etchants, photoresist materials, additives and the documents to request.

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How to Source High-Purity Solvents for Electronics Applications from China

A practical guide to sourcing high-purity solvents for electronics use from China, covering key specs, packaging and supplier questions.

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Acetic Anhydride Export from China: What Buyers Should Prepare

Planning to import Acetic Anhydride from China? Understand the documentation, end-use and packaging considerations buyers typically need to prepare.

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How to Source Controlled Chemicals from China Responsibly

A practical, compliance-first guide to sourcing controlled chemicals from China, covering documentation, end-use requirements and supplier screening.

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Silane Coupling Agents from China: A Practical Sourcing Guide

Sourcing silane coupling agents from China? Learn about common silane types, key specifications and what to check before requesting a quotation.

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How AI Infrastructure Is Driving Demand for Electronic Chemicals in China

AI data centers, chips and advanced electronics are increasing demand for specialty chemicals in China. See what global buyers should check before...

Market Intelligence

China Plastic Additives Market 2026: Trends and Supply Outlook

An overview of China's plastic additives market in 2026: antioxidant and UV stabilizer supply conditions, pricing drivers, environmental compliance impact, logistics considerations,...

Product Knowledge

UV Absorber 326: Applications, Specifications and Supplier Guide

Complete technical and sourcing guide for UV Absorber 326 (CAS 3896-11-5, Tinuvin 326 equivalent): chemical properties, polymer applications, typical usage levels, comparison...

Product Knowledge

How to Choose HALS Stabilizers for Plastics

Technical selection guide for Hindered Amine Light Stabilizers (HALS): molecular weight classes, NOR-HALS, compatibility with flame retardants and pigments, application dosage, and...

Sourcing Guides

How to Select a Reliable Antioxidant Supplier from China

A practical step-by-step guide for global buyers on evaluating Chinese antioxidant suppliers: quality systems, documentation, regulatory compliance, lead times, and common red...

Product Knowledge

Sulfur Antioxidants vs Phenolic Antioxidants: Key Differences

Compare sulfur-based thioester antioxidants (DSTDP, DLTDP) and phenolic antioxidants (Antioxidant 1010, 1076): mechanism, performance, synergies, and selection guide for polymer formulators.

Product Knowledge

How Antioxidants Improve Polymer Stability

Learn how polymer antioxidants work, the mechanism of oxidative degradation, the difference between primary and secondary antioxidants, and how synergistic systems protect...

Product Knowledge

Antioxidant 1010 vs Antioxidant 168: How to Choose

Compare Antioxidant 1010 (CAS 6683-19-8) and Antioxidant 168 (CAS 31570-04-4): mechanism, applications, synergy, and practical selection guidelines for polymer stabilization systems.

Product Knowledge

What Is Antioxidant 168 Used For? Applications, Specs and Sourcing

Antioxidant 168 (CAS 31570-04-4, generic Irgafos 168) is a phosphite secondary antioxidant essential for polymer melt processing stability. Learn its mechanism, applications,...

Product Knowledge

DSTDP vs DLTDP: Key Differences in Polymer Stabilization

Compare DSTDP (CAS 693-36-7) and DLTDP (CAS 123-28-4): chain length, molecular weight, performance at temperature, cost, and how to select the right...

Product Knowledge

What Is DSTDP? Uses, CAS Number and Supplier Guide

DSTDP (Distearyl Thiodipropionate, CAS 693-36-7) is a sulfur-based secondary antioxidant used extensively in polyolefin plastics. Learn its mechanism, applications, specifications, and sourcing...

Bio-based Solvents: Green Revolution and Industrial Future in the Carbon Neutral Era
Market Intelligence

Bio-based Solvents: Green Revolution and Industrial Future in the Carbon Neutral Era

At the just-concluded CPHI Japan, a phenomenon sparked the attention of the global chemical industry: the explosive growth in demand for bio-based...

What  is the polymer additives
Product Knowledge

What  is the polymer additives

In the context of polymer chemistry, "polymer additions" often refers to various additives mixed into polymer bases to enhance or modify their...

Н-метиланилин: производство и экспорт присадок к бензинам
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Н-метиланилин: производство и экспорт присадок к бензинам

Н-метиланилин

N-methylaniline: gasoline additive production and export
Product Knowledge

N-methylaniline: gasoline additive production and export

N-methylaniline

Why You Should Purchase Chemicals in China through Sunchem
Sourcing Guides

Why You Should Purchase Chemicals in China through Sunchem

China has become a major player in the global chemical market in recent years. With its vast production capacity and lower costs,...

Fluorinated Pharmaceutical Intermediates
Product Knowledge

Fluorinated Pharmaceutical Intermediates

4-fluorocyclohexanone, 2,2-difluoropropanol and 2-amino-3-bromo-5-fluoropyridine are important intermediates for the synthesis of anticancer drugs, anti-leukemia drugs and antibiotic drugs, respectively, with high value...

Suspension Concentrate
Product Knowledge

Suspension Concentrate

Suspension concentrate is a coarse suspension system with water as the dispersing medium, which is evenly dispersed in water through grinding and...

Hindered Amine Light Stabilizers
Product Knowledge

Hindered Amine Light Stabilizers

Hindered amine light stabilizers (HALS) are one of the most important thermal/light stabilizing agents of polymeric materials due to their excellent compatibility...

Rubber Vulcanization Accelerator
Product Knowledge

Rubber Vulcanization Accelerator

Vulcanization, as the key step in rubber process,directly affects the processing and performance of rubber products. Compared with sulfur alone, the presence of...

Amino Acid-based Surfactants
Product Knowledge

Amino Acid-based Surfactants

Amino acid-based surfactants consist of amino acid moiety as the polar headgroup attached to one or more alkyl chains. Since they are...

Optimization of Addition Scheme of PMMA Resin Synthesis Additive
Product Knowledge

Optimization of Addition Scheme of PMMA Resin Synthesis Additive

Polymethyl methacrylate was prepared by free radical polymerization of methyl methacrylate. The polymerization process includes solution, suspension polymerization, bulk polymerization, etc., and...

New Domestic Materials
Market Intelligence

New Domestic Materials

new materials industry is in the transition stage from self-sufficiency of low-end products to independent research and development of mid- and high-end...

China's API Industry Faces Hidden Worries under the Opportunities
Market Intelligence

China's API Industry Faces Hidden Worries under the Opportunities

Since 2020, there has been an outbreak of the New Crown epidemic. After more than 3 months of strict prevention and control...

Bio-based Coatings Market: Bright Future Ahead
Market Intelligence

Bio-based Coatings Market: Bright Future Ahead

Industry experts such as ChemQuest and Orr & Boss estimate that bio-based systems account for about 5% of the overall coatings market...

Development of New Varieties of Fungicides
Product Knowledge

Development of New Varieties of Fungicides

The development of triazole fungicides has been particularly notable since 1973 when Bayer introduced the first commercialized fungicide triadimefon with chiral carbon....

Polyimide Hollow Fiber
Product Knowledge

Polyimide Hollow Fiber

Polyimide hollow fiber is widely used in gas separation and alcohol dehydration due to its high specific surface area and loading density.

Polyurethane Modified Waterborne Alkyd Resin Coatings
Product Knowledge

Polyurethane Modified Waterborne Alkyd Resin Coatings

Polyurethane modified waterborne alkyd resin PUA-1642 was chosen as a film-forming substance and a waterborne alkyd resin coating was prepared.

Water-based Alkyd Resin Coatings
Product Knowledge

Water-based Alkyd Resin Coatings

Due to the easy availability and low price of raw materials for alkyd resin coatings, and the excellent gloss, flexibility, and adhesion...

Food Additives Research in China
Market Intelligence

Food Additives Research in China

The food additives industry plays an important role in the modern food industry as a pillar industry. The development of its research...

Organic Pigments for Powder Coatings
Product Knowledge

Organic Pigments for Powder Coatings

The food additives industry plays an important role in the modern food industry as a pillar industry. The development of its research...

Multi-functional Natural Polymer-based Water Treatment Agents
Product Knowledge

Multi-functional Natural Polymer-based Water Treatment Agents

Water treatment agents,including coagulants / flocculants,bactericidal agents,and scale inhibitors,play important roles in the field of water treatment.

China's API Industry Enters a Big Era of Growth
Market Intelligence

China's API Industry Enters a Big Era of Growth

The Indian epidemic could create a large supply gap in the global specialty API segment. Currently, China and India already represent a...

Domestic Rise of Functional Silanes
Market Intelligence

Domestic Rise of Functional Silanes

Functional silanes are one of the four major classes of silicone materials and are widely used for their excellent performance.

Technological Innovation of Glufosinate Enterprises
Product Knowledge

Technological Innovation of Glufosinate Enterprises

Glufosinate still has room for growth, with a focus on seed promotion beyond GM oilseed rape and short-term mutational growth from paraquat...

The Amino Acid Industry Ushers in a New Round of Boom
Market Intelligence

The Amino Acid Industry Ushers in a New Round of Boom

The amino acid industry is expected to usher in a new round of boom due to cost support on the raw material...

The Development Trend of Intermediates Industry
Market Intelligence

The Development Trend of Intermediates Industry

This report mainly provides an in-depth analysis of the intermediates industry. As an important field of fine chemical industry, intermediates industry has...


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