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Sodium hydrosulphite
Quality standard: HG2074-2004, JISK1476-1995, HG/T2682-1995
Molecular formula: Na2S2O4
CAS NO.: 7775-14-6
Appearance: White free-flow crystal powders
Packing: In 50kg net iron drum
Application:
1. Widely used in textile industry for vat dyeing, reduction cleaning, printing and stripping, textile textile bleaching.
2. It is also used in bleaching paper pulps, especially mechanical pulps, it's the most fittable bleaching agent in pulps.
3. It is used in bleaching kaolin clay, fur bleaching and reductive whitening, bleaching of bamboo products and straw products,
4. It is used in mineral, the compound of thiourea and other sulphides.
5. It is used as reducing agent in chemical industry.
6. Sodium hydrosulfite food additive grade is used in foodstuffs, as bleaching agent and preservative dried fruits, dried vegetable, vermicelli, glucose, sugar, rock sugar, caramel, candy, liquid glucose, bamboo shoots, mushrooms and canned mushrooms.

Product specifications:
90%min
Na2S2O4: ≥ 90%
Fe: ≤ 20ppm
Zinc(Zn): ≤ 1ppm
Other heavy metal
(calculated as Pb): ≤ 1ppm
Water Insolubles: ≤ 0.05%
Shelf Life(month): 12

88%min
Na2S2O4: ≥ 88%
Fe: ≤ 20ppm
Zinc(Zn): ≤ 1ppm
Other heavy metal
(calculated as Pb): ≤ 1ppm
Water Insolubles: ≤ 0.05%
Shelf Life(month): 12

85%min
Na2S2O4: ≥ 85%
Fe: ≤ 20ppm
Zinc(Zn): ≤ 1ppm
Other heavy metal
(calculated as Pb): ≤ 1ppm
Water Insolubles: ≤ 0.05%
Shelf Life(month): 12