Sodium dichromate (Sodium bichromate):

Molecular formular:Na₂Cr₂O₇.2H₂O
Specific gravity:2.52(13)
Usage:It is used as the raw material forproducing chromic salts(chromic anhydride,chromic oxide and potassium dichromate etc),oxidizer for producing alkaline light greendyestuff,saccharin,synthetic camphor andsynthetic fidre etc.

Sodium dichromate is used as oxidizerwhen byeing with aniline,ageng atter dyeingwith acid mordant dyes in printing and dyeingindustry.

It is used for purity treatmen afterzinkplating so as to increase brightness ingalvanizing industry.
It is used to tan hides etc.in hide-treating industry.
Quality standard:

item	specification
	high-class products	first-class products	qualifiec products
(Na2Cr2O7.2H2O)%	99.3	98.3	98.0
SO4%	0.20	0.30	0.40
Cl%	0.10	0.10	0.20