Today is:
Trimellitic anhydride (TMA)
Molecular formula:

C9H4O5

Structural formula:
Property:
Appearance: white or light yellow flake.
Solubility: soluble in hot water, acetone, ethyl acetate, cyclohexanone, soluble in absolute ethyl alcohol and react with it.
Applications:
It is used to produce polyester resin, polyamide resin, plasticizer(TOTM), sizing agent, smoke suppressor etc.
Package:
25kg net weight in line model compound bags, or packed in line model comound bags at 500/1000kg net weight.
Specification:
Item
Specification
Appearance white or light yellow flake
Acid number, mgKOH/g ≥ 873.00
Anhydride content, % ≥ 98.00
Melting Point, °C ≥ 164.0
Fuse chroma,  Pt-Co ≤ 120#
PA content,  ppm ≤ 300(Superior grade ≤100)
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