Pyromellitic Dianhydride (PMDA)

Identity and Form

Pyromellitic dianhydride, commonly abbreviated PMDA, is an aromatic dianhydride identified by CAS 89-32-7 and EC 201-898-9. Its formula is C10H2O6 and molecular weight is 218.12 g/mol. ZXCHEM supplies white crystalline, moisture-sensitive powder with assay ≥99.5%.

Grade and Quality Checks

The supply specification controls trimellitic acid, free acid, oil-insoluble matter, colour, residual acetone, halides, particle size and total metals. The melting interval is 286–287.5°C. Particle-size limits specify ≤5% above 500 µm and ≥95% above 80 µm; retain the stated cutoffs when comparing analysis.

Application Selection

PMDA is a monomer for technically controlled polyimide manufacture and can be evaluated in epoxy curing and polymer chain-extension chemistry. Relevant development areas include insulation films, fibres, coatings and adhesives.

Select moisture and impurity limits against reaction control and the intended polymer properties; this listing does not guarantee finished-product electrical or flame-retardant performance.

Packing and Handling

Packing options are 1 kg bags or 20 / 25 kg lined cartons. Preserve closed moisture-protective packaging and use dry transfer equipment. The solid-substance reference is non-dangerous goods for transport, while its eye-damage and respiratory/skin-sensitization hazards require controlled dust handling and appropriate protective equipment.

See related other chemicals in our catalog.