Specification      industry grade HG/T 2074-1991 JIS K 1476-1995
food grade GB 2682-1995
 
Item
 90%
 88%
 85%
 food grade
 
Na2S2 O4
 min 90%
 min 88%
 min85%
 min85%
 
(Fe)
 max 20ppm
 max20ppm
 max20ppm
 max 20ppm
 
(Zn)
 max1ppm
 max 1ppm
 max1ppm
 max1ppm
 
Clarity
 Clarify
 Clarify
 Clarify
 Clarify
 
EDTA
 -
 -
 -
 Qualified
 
(As)
 -
 -
 -
 max 1ppm
 
Other heavy metals(pb)
 -
 -
 -
 max 1ppm
 
HCHO
 -
 -
 -
 max 0.05%
 
water insoluble matter
 max 0.05%
 max0.05%
 max 0.05%
 -
 
 
Uses
1, It is for vat dyes staining the reducing agent, reducing hair bleaching agents, vat dyes printing auxiliaries, silk scouring and bleaching agent, dyeing agents and objects of the peel color dye vat cleaning agent in the textile industry.
2, It is used as a mechanical pulp, mechanical pulp mill hot and deinking pulp bleaching agent in pulp and paper industry.
3, It is used as sugar, candy, candied fruit, caramel, cookies, fans, etc. bleach and food preservation agent in the food industry.
4, As a bleaching agent is widely used to restore the kaolin bleaching; fur whitening bleaching and restore; bamboo products and straw products such as bleach.
5, It is used as a reducing agent in chemical industry.
6, Packing   Barrels sealed packaging, polyethylene film bag lined with double-layer 15KG/20KG/25KG/50KG/100KG/200KG