THPA/Tetrahydrophthalic Anhydride/935-79-5/85-43-8/Curing agent Molecular formula C8H8O3 Molecular weight 152.16 CAS NO. 935-79-5or85-43-8 UN NO. 2698 EINECS. 213-308-7 Chemical name Tetrahydrophthalic Anhydride Brief Introduction THPA is White flakes and Specific gravity 1.20. A new type of environmentally friendly construction materials of the main raw material, used as curing agent of light color or gas-drying alkyd resin, optical stable unsaturated polyester. Specification Test Item Limit Assay 99% Package and Storage 25kg in plastic bag lined PP woven bag. Avoid fire, moisture, and water. Kept in cool, dry and ventilating place, far away from fire