CAS No.: | 7775-14-6/7631-94-9 |
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Formula: | Na2s2o4 |
EINECS: | 231-890-0 |
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Sodium Hydrosulfite
Other name: Sodium Hydrosulphite, Sodium Dithionite,SHS
Chemical Formula:Na2S2O4
CAS No.:7775-14-6
EINECS: 231-890-0
UN No.:1384
Dangerous Class:4.2
HS Code:28311000
Appearance: Free-flowing white crystalline powder
Odor: Odorless or with a slight odor of sulfur dioxide
2.Simple introduction
The powder is a white sand crystal or light yellow powder. The infusible powder is insoluble in ethanol, soluble in sodium hydroxide solution, reacts violently with water and burns.
The aqueous solution of the insurance powder is unstable in nature and has a strong reducing property, belonging to a strong reducing agent. It is easily exposed to oxygen in the air and oxidizes. At the same time, it easily absorbs moisture and degenerates, and it can seize oxygen in the air and give off a pungent sour taste.
3.Specifications
Index | Technical Grade | Food Additive | ||
Na2S2O4 | ≥ 90% | ≥ 88% | ≥ 85% | ≥ 88% |
Iron (Fe) | ≤20ppm | ≤ 20ppm | ≤ 20ppm | ≤ 20ppm |
Zinc (Zn) | ≤ 1ppm | ≤ 1ppm | ≤ 1ppm | ≤ 1ppm |
solution appearance | clear | clear | clear | clear |
EDTA | / | / | / | qualified |
Arsenic(As) | / | / | / | ≤ 1ppm |
Other heavy metal( As Pb) | ≤ 1ppm | ≤ 1ppm | ≤ 1ppm | ≤ 1ppm |
Formate (As HCHO) | / | / | / | ≤ 0.05% |
water insolubles | ≤ 0.05% | ≤ 0.05% | ≤ 0.05% | / |
Cadmium (Cd) | / | / | / | ≤ 2ppm |
Plumbum (Pb) | / | / | / | ≤ 5ppm |
4.Applications
a.Widely used in printing and dyeing industry,such as cotton fabrics dyeing auxiliary, silk fabric bleaching.
b.Used as bleaching agent in paper industry.
c.Used as bleaching agent,antiseptic agent and antioxidant agent in food industry.
d.Used as bleaching agent for soap,oil esters,pulp in light industry.
e.Used for producing rongalite,sodium thiosulfate,thiourea,sulfur,benzoic acid,six O(medical),synthetic dyes,also used copperplate printing,analytical reagent in the chemical industry,etc.
f.Used as reducing agent in printing and dyeing industry.
5.Package & Loading
(1) Packing: 50kg net / Drum.
(2) Loading quantity :21MT/20'container.