naphthol as-g

Naphthol AS-G (C.I. Azoic Coupling Component 5) is a critical chemical intermediate. You must verify the purity level (typically ≥98%), melting point (200-205°C), and moisture content (≤0.5%). Ensure the particle size is consistent to prevent clumping during the dyeing process, and request a Certificate of Analysis (COA) for every batch to confirm the alkali-insoluble matter is within acceptable limits.

It is primarily used in the textile industry for dyeing and printing cotton fibers, specifically to produce yellow and orange shades when coupled with various fast bases. It is also a vital raw material in the production of organic pigments (such as Pigment Yellow 12 and 13) used in printing inks, plastics, and coatings. Understanding your specific application helps the supplier adjust the fineness and dispersibility of the product.

As a chemical substance, it must comply with REACH regulations for the European market and TSCA for the US. Suppliers must provide a comprehensive Material Safety Data Sheet (MSDS/SDS). Ensure the product meets OEKO-TEX Standard 100 requirements if the end-use is for apparel, ensuring the absence of restricted aromatic amines.

Request a pre-shipment sample (PSS) to conduct a lab-scale coupling test to check color strength and shade consistency. Evaluate the solubility in caustic soda; a clear solution without residue is a hallmark of high-quality Naphthol AS-G. For large orders, consider third-party inspection services (like SGS or Intertek) to verify weight and packaging integrity.

Naphthol AS-G should be packed in moisture-proof 25kg fiber drums or woven bags with internal plastic liners. It must be stored in a cool, dry, and well-ventilated warehouse away from oxidizing agents. During cross-border transit, ensure the containers are sealed and labeled according to GHS standards to avoid customs delays or safety hazards.

Always use secure payment methods such as Letters of Credit (L/C) or trade assurance services provided by reputable platforms like Made-in-China.com. Conduct a factory audit or verify the supplier's ISO 9001 and ISO 14001 certifications to ensure they have a stable production capacity and environmental compliance, reducing the risk of sudden supply chain disruptions due to regulatory shutdowns.

Check the HS Code (typically 2924.29) for Naphthol AS-G in your country to determine import duties and taxes. Be aware of anti-dumping duties that may apply to chemical products from specific regions. Ensure all documentation, including the Commercial Invoice, Packing List, and COA, accurately reflects the chemical composition to facilitate smooth customs clearance.

Chemical prices are often tied to raw material costs (like acetoacetanilide). Negotiate based on volume tiers; orders exceeding 5 tons usually command a 5-10% discount. Discuss lead times clearly, as production cycles can take 15-30 days depending on the supplier's current stock and environmental inspection schedules in their local region.