Item	GB6009-2003 I type First grade	Result of common product	Result of neutral product	Result of low chlorine product
Na2SO4	≥99.0	99.20	99．30	99．65
Water insoluble matter %	≤0.05	0.02	0．03	0．01
Ca & Mg %(Mg)	≤0.15	0.02	0．02	0．02
Chloride %(Cl)	≤0.35	0.19	0．20	0．04
(Fe)	≤0.002	0.001	0．001	0．001
Moisture %	≤0.20	0.02	0．02	0．02
Whiteness %	≥80	88	85	83
PH	NA	NA	(1% solution )7.5	(5% solution )7.2

sodium sulphate anhydrous

  Molecular formula: Na₂SO₄

  Molecular weight: 142.04

 Property: white granular crystal or powder , Na₂SO₄·7H₂O) is white rhombic crystal .

 Uses: used as filler of detergent, the making of sodium sulphide, water glass, or used in papermaking, glass, dye and used as filler, dyeing auxiliary, laxative, antidote, t also can be used in fiber, lether, metallurgy, enamel and soap.