Name 1, 2, 4, 5-Benzenetetracarboxylic anhydride (PMDA) Cas 89-32-7 Structure form Physical and chemical properties pmda is white to light yellow powder or block crystal. Its specific gravity is 1.68.It can be sissolved in organic solvents such as acetone and dimethylacetamide. Quality standard item Standard Appearance: White to light yellow powder or block crystal Content: 99.5% Melting point: 284-287 Neutralization equivalent: 54.50.2 Expatiate the larger scale pmda production lines in china with advanced technology and continuous catalytic gas-phase oxidation process.Complete measures of test and analysis guarantee the stable and reliable product quality.Pmda is produced in several grades to meet specific market requirements and is sold worldwide. Applications the main applications of pmda if to produce polyimide resin and bi-oriented polyimide sheets, gloss retaining and curing agent for powder coating, high temperature-resistant electrical insulating enamel, solid lubricant, solidifying agent fo epoxy resin, plasticizer and crosslinking agents for polyester resins.Etc. Packaging & storage double packed in paper fibre drums lined with plastic bage, net weight:25kgs to 200kgs according to customers'requirment.Keep in dry and well ventilated place, protected from moisture.