Tetrahydrophthalic anhydride

Tetrahydrophthalic anhydride (CAS 85-43-8), commonly abbreviated as THPA, is a cyclic dicarboxylic anhydride used as a curing agent and reactive intermediate in polymer manufacturing. It functions as a hardener for epoxy systems and a building block for polyester and alkyd resins. This chemical is utilized across the coatings, adhesives, and plastics industries. In epoxy coating formulations, THPA acts as a stoichiometric curing agent, producing crosslinked networks with good mechanical performance and chemical resistance.

These properties make it ideally suited to industrial and protective coatings. Alkyd and unsaturated polyester resin producers use it as a monomer to control flexibility and reactivity in the final resin product. In adhesive and sealant systems, THPA-cured epoxy formulations deliver the bond strength and thermal stability required for structural and assembly applications. This ensures long-term durability in demanding environments.

Printing ink manufacturers incorporate THPA-based resins where controlled cure response and adhesion to packaging substrates are required. This versatility makes it a staple in modern chemical manufacturing and processing. THPA is supplied as a white to off-white crystalline solid or powder. Technical grade is the standard commercial form, with purity specifications typically at 98% or above to meet industrial requirements.

Bulk supply is available in bags or drums, with packaging options scaled to industrial procurement volumes. Our logistics network ensures reliable delivery for large-scale manufacturing operations and specialized chemical facilities.