Hexahydrophthalic anhydride (HHPA) is widely used for electronics applications, e.g. HHPA cured epoxy resins have excellent dielectric properties, high-temperature stability, and high glass transition temperatures. HHPA is used as a curing agent in adhesive coatings and sealant materials, e.g. for the second-generation two-part epoxy adhesive synthesis. Hexahydrophthalic anhydride is also used in the manufacture of alkyd and polyester resins, insecticides, and rust preventives.
It has been obtained by heating the trans-acid or anhydride at 200o. Crystallise it from *C6H6/Et2O or distil it. [Kohler & Jansen J Am Chem Soc 60 2145
1938, Abell J Org Chem 22 769 1957, Beilstein 17 II 452, 17 III/IV 5931.]
White crystalline powder
 Guy Rabilloud, High Performance Polymers. Vol. 1 Conductive Adhesives, 1997
 John Burke Sullivan and Gary R. Krieger, Clinical Environmental Health and Toxic Exposures, 2001
 B. A. G. Jönsson, H. Welinder, C. Hansson and B. Ståhlbom, Occupational exposure to hexahydrophthalic anhydride: air analysis, percutaneous absorption, and biological monitoring, International Archives of Occupational and Environmental Health 1993, vol. 65, 43-47
ChEBI: A cyclic dicarboxylic anhydride that is the cyclic anhydride of hexahydrophthalic acid.