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30.PYROMELLITIC
ACID
(BENZENE-1.2.3.4.5-TETRA-CARBOXYLIC ACID)(PMA)
CAS No. 89-0-54
| Formula: |
C10H6O8 |
| Molecular
Weight: |
254 |
Quality standard
| Melting
Point ¡æ |
≥
282 |
Purity
wt% |
≥
98.5 |
Ash
Content |
≤400ppm |
Volatile
Fraction wt% |
≤0.5 |
Organic
Impurity wt% |
≤1.5 |
Form |
Powder |
Colour |
White |
|
|
Uses:
1.useful as raus material producing polyimide.
2.useful as raw material producing tetraoctyl ester
of pyromellitic acid.
3.useful as paints.
|
31.PYROMELLITIC
DIANHYDRIDE(PMDA)
CAS No.89-32-7
1. Specification
Appearance white or light yellow
Melting point 282-288 
Neutralization equivalent54.5±0.2
Content ≥99%
2.Chemical and physical specification
Boiling point 397-400
Density 1.68
3.Application
The product is a chief material
for high temperature insulant, used mainly for the producing
of polyimid resin, thin film, and insulating paint. It is
also a high temperature curing agent and plasticizer. Some
kinds of curing agents of powder coating are made from it.
4.Storage
Keep in dry and ventilating place,
away from moisture, fire and rain.
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