Molecular weight:  118.09

Property:  White crystal. Melting point 185 °C; Boiling point 235 °C(decomposed into anhydride); density:  1.572; soluble in water, slightly soluble in ethanol. Used in the preparation of heterocyclic compounds

Index name

Index request

First grade

Qualified

Content, % ≥

99.0-100.5

99.0-100.5

Melting point, °C

184-188

183-188

Ease oxide, % ≤

0.07

0.1

Sulphate(SO₄), % ≤

0.02

0.07

Water, % ≤

0.5

0.5

Ferric, % ≤

0.0008

0.001

Chloride(Cl), % ≤

0.005

0.007

Arsenic(As) , % ≤

0.0002

No request

Heavy metal(Pb), % ≤

0.001

No request

Residue of roasting, % ≤

0.02

0.05

Water insoluble, % ≤

0.01

0.02

Use: Used in the production of dyes, alkyd、glass fiber reinforced plastic、ion exchange resin and pesticides; in the synthesis of narcotic, prophylactic etc.; also used in edible spice and analytic agents.

Packing and storage:  Packed in woven bag lined with plastic film, net wt. 25kg/bag.

Note: Irritant to skin,eye and respiratory system.