Tetrachlorophthalic anhydride

Tetrachlorophthalic anhydride (CAS 117-08-8, EC 204-171-4) is a chlorinated cyclic anhydride commercially known under trade names including NIATHAL, Niagathal, Tetrathal, and NSC 1484. It carries no assigned E-code and is classified within the flame retardant chemical category under HS code 29173990.

In polymer and resin formulations, tetrachlorophthalic anhydride functions as a reactive flame retardant by incorporating chlorine atoms directly into the polymer backbone, reducing ignitability without relying on additive migration. It also serves as a plasticizer in certain resin systems and as a reactive intermediate in polyester and epoxy polymerization, particularly for applications in building materials, textiles, and printed packaging substrates.

This material is supplied as white flakes or powder and is subject to REACH registration requirements for EU market supply. Procurement teams should confirm SDS compliance and substance registration status prior to ordering. Standard industrial packaging formats apply; contact your supplier for available lot sizes and documentation.