Description

Phthalic anhydride Phthalic anhydride is an important organic chemical raw material which is mainly used to make plasticizer in plastic, alkyd resin, dye, unsaturated resin and some medicines or farm chemicals. molecular formula :C8H4O3 molecular weight :**8.*2 Quality standards of phthalic anhydride GB/T *********6 Item Index Top grade First grade Qualified product Appearance white scaly or crystalline powder white scaly or crystalline powder with slight colors molten Chroma(Chroma no. )≤ *0 *0 **0 thermostable Chroma(Chroma no. )≤ *0 **0 - Chroma of vitriol(Chroma no. )≤ *0 **0 **0 crystallization point°C≥ **0.5 **0.3 **0.0 Purity(mass fraction)%≥ *9.*0 *9.*0 *9.*0 Free acid(mass fraction)≤ % 0.*0 0.*0 0.*0 Ash(mass fraction)%≤ 0.*5