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Detailed Introduction
1、CAS No.: 7757-83-7
2、Molecular Formula: Na2SO3
3、Molecular Weight: 126.04
White crystal or powder; no foul. Soluble in water, very slightly soluble in ethanol, almost insoluble in ether. White hexagonal prismatic crystals,soluble in water (when 0°C 12.54g/100ml water; When 80°C 283g/100ml water), in 33.4°C The maximum solubility of about 28% when the aqueous solution is alkaline. Slightly soluble in alcohol, insoluble in liquid chlorine, ammonia. Easily oxidized in air sodium, when the temperature is decomposed into sodium sulfide. To strengthen the reducing agent, reacts with sulfur dioxide,sodium bisulfite, reacted with the acid salt.
4、Usage:
4.1 : Bleaching agents, preservatives, leavening agents, antioxidants and food preservation in the food industry. Also used in pharmaceutical synthesis. As a reducing agent in the production of dehydrated vegetables.
4.2;As a preservative and a cosmetic antioxidant for hair dyes and cosmetics. Used to block the oxidation of dyes in hair dyes. It is also used in other cosmetics and food industries.
5、Specification
| Quality Standard(GB1886.8-2015) | |
| Items | High Standard |
| Sodium Sulfite(Na2SO3)w/% ≥ | 96.0 |
| Fe w/% ≤ | 0.01 |
| Water insoluble material(Na2SO3)w/%≤ | 0.60 |
| Heavy metal(Pb)(mg/kg) ≤ | 10.0 |
| As(mg/kg)≤ | 2.0 |
| Clarity | clear |
Packing: External packing is PP woven bag, Internal packing is PE bag, the thickness≥0.05mm. There are "Sodium sulfite" printed on the external packing,with the sign of "Avoid moisture and heat". The trademark is "Sanxiang".
Storage & defence: Stored in cool and dry place, avoid moisture and heat. No breakage, No mixed with oxidant and toxic matter. The storage period is 6 month since the production date. It should be transported by clean car, with covering matter, avoid raining.
