CAS No. 7775-14-6
EINECS No. 231-890-0
Molecular Formula: Na2O4S2 (Sodium Dithionite)
Mol wt. 174.10
HS Code 2831.10

Physical state: White crystalline powder
Scent: No scent or slight scent of SO2

Quality standard:
Technical grade: HG/T 2074-1991 JIS K 1476-1995
Food grade: GB2682-1995
Warranty period: 12 months after production date
 

Application:
1. Vat dyeing, printing and stripping, reduction cleaning
2. Textile materials(silk, wool, nylon and other fibers)bleaching
3. Pulp and paper brightening
4. Pulp deinking
5. Kaolin clay bleaching
6. Foodstuffs ( sugar, honey, gelatin, etc)bleaching
7. Chemical synthesizing
 

Specification	90%	88%	85%	Food grade
Na2S2O4	≥ 90%	≥ 88%	≥ 85%	≥ 85%
Fe	≤ 20ppm	≤ 20ppm	≤ 20ppm	≤ 20ppm
Zn	≤ 1ppm	≤ 1 ppm	≤ 1ppm	≤ 1ppm
Solution Appearance	Clear	Clear	Clear	Clear
Other heavy metal (as pb)	—	—	—	—
HCHO	—	—	—	≤ 0.05%
Water insoluble matter	≤ 0.05%	≤ 0.05%	≤ 0.05%	—
Reserve period (months)	12	12	12	12