Pyromellitic Dianhydride

Name:
Pyromellitic Dianhydride
Detailed information:

M Formula:	C6H2(C2O3)2.
Chemistry structure:
Properties:
White powder. D 1.68, mp 286C, bp 397–400C, 305–310C (30 mm Hg) bulk d 21 lb/cu ft. Soluble in some organic solvents; hydrolyzes to the acid when exposed to moisture.
Derivation:
Oxidation of durene, either in wet process by nitric acid or a dichromate, or as direct air oxidation with catalyst.
Grade:
98+% purity.
Hazard:
Skin irritant.
Use:
Curing agent for epoxy resins used in high-temperature laminates, molds, and coatings; cross-linking agent for epoxy plasticizers in vinyls, alkyd resins; intermediate for pyromellitic acid.