1,2,4,5-Benzenetetracarboxylic acid CAS NO.89-05-4

1.Structural formula: 2.Physical properties:white,crystal powder, specific weight is 1.79; slightly soluble in water and ether; soluble in ethyl alc…

1.Structural formula: 2.Physical properties:white,crystal powder, specific weight is 1.79; slightly soluble in water and ether; soluble in ethyl alcohol; at above melting point, it would lose water to form pyromellitic dianhydride, it is also capable of subliming and slowly absorbing moisture from atmosphere. 3.Application: organic synthetic intermediate for producing polyesterm polyimide, polyimide resin, and the deluster for powder paints, plasticizer for tetraoctyl pyromellitate etc.. 4.Quality Standard: gb/t19001--2000 idt ISO 9001:2000 STANDARD Appearance White powder Content ≥99% Evaporating content: ≤1% ASH ≤400ppm Acidity ≥870mg/g 5.Packing and storageinternal:plastic, external woven bag ( according to the specific demand of customers); net weight is 25kg/bag,800kg/bag,stored in dry, cool place away from the heat source. 6. Capacity:800t/aPyromellitic acidfor Synthesis of polyimide and Octyl Pyromellitic main material of Extinction curing agent.  Pyromellitic acid   PMA    Usewhite,crystal powder, specific weight is 1.79; slightly soluble in water and ether, it is used for Synthesis of polyimide and Octyl Pyromellitic and it is the main material of Extinction curing agent.         PackingInternal plastic bag, external woven bag; net weight is 25kg per bag, it can be according to the specific demand of customers.