Hexahydrophthalic anhydride

Hexahydrophthalic anhydride (HHPA, CAS 85-42-7) is a cycloaliphatic anhydride supplied under trade names including Rikacid HH, Araldite HT 907, and Lekutherm Hardener H. It carries no E-code designation and is registered under EC 201-604-9, with REACH compliance applicable across European markets.

In epoxy resin systems, HHPA functions as a curing agent by reacting with epoxide groups to form ester linkages, producing thermoset networks with good thermal stability and electrical insulation properties. It is also employed in alkyd resin synthesis and as a reactive intermediate in fragrance and personal care formulations where controlled esterification is required.

HHPA is available in solid form and supplied in standard industrial packaging in accordance with REACH regulations. Procurement teams should confirm supplier SDS documentation and purity specifications, as grades vary depending on end-use requirements in coatings, adhesives, or personal care applications.