For procurement professionals and R&D scientists in the pigment industry, understanding the precise specifications of key intermediates like Naphthol AS-KB (CAS 135-63-7) is fundamental to ensuring product quality and process efficiency. As a leading manufacturer and supplier of fine chemical intermediates, we detail the critical parameters that buyers should consider when sourcing this essential compound.

The primary function of Naphthol AS-KB lies in its role as a coupling component for organic pigments, particularly reds. Its chemical name is 3-hydroxy-N-(5-chloro-2-methylphenyl)-2-naphthoformamide, with the molecular formula C18H14ClNO2 and a molecular weight of 311.76. When evaluating Naphthol AS-KB from a supplier, key specifications to scrutinize include:

  • Appearance: Typically, Naphthol AS-KB is a light beige powder. Deviations from this might indicate impurities or incorrect processing.
  • Assay/Purity: A high assay, such as ≥98.5% or even higher (e.g., 99.17% as provided by some manufacturers), is crucial for optimal reaction yields and pigment performance. HPLC methods are often used for verification.
  • Melting Point: A melting point of ≥240℃ is a critical indicator of purity and structural integrity.
  • Insoluble in Alkali: This value, often specified as ≤0.50% or lower (e.g., 0.15%-0.18%), indicates the absence of alkali-soluble impurities that could interfere with pigment synthesis or applications.
  • Acid Content: Parameters like '2:3 acid content' or similar specifications, usually kept very low (e.g., ≤0.20%), are important for ensuring consistent chemical behavior.
  • Sieve Residue: The amount of material retained on a specific mesh sieve (e.g., 60M or 80M) should be minimal (e.g., ≤5.0%), ensuring a fine, easily dispersible powder.

When you decide to purchase Naphthol AS-KB, particularly from China-based manufacturers and suppliers, it's essential to request detailed technical data sheets (TDS) and certificates of analysis (COA) that confirm these specifications. Understanding these technical details will help you make an informed decision and ensure that the Naphthol AS-KB you buy meets your exact requirements for pigment manufacturing.

We are committed to transparency and quality. If you are looking to buy Naphthol AS-KB or need a reliable supplier for your organic pigment intermediate needs, please contact us for detailed product specifications, current Naphthol AS-KB price, and quotation.