Name: sodium dithionite

Other Name: insurance powder

Chemical formula: Na2S2O4

Molecular weight: 174.108

CAS : 7775-14-6

EINECS : 231-390-0

Safety description: Toxic, flammable or exploded when exposed to water.

Hazard description: spontaneous combustion, explosive, poisonous, instability of aqueous solution

Ignition temperature: 250 ° C

UN number: 1384

Main ingredients: pure product

1. Properties: white sand crystal or light yellow powder

2. Melting point (° C): 52 ~ 55 (decomposed)

3. Boiling point (° C): 130 (decomposition)

4. Relative density (water = 1): 2.1 ~ 2.2

5. Ignition temperature (℃): 250

6. Solubility: soluble in water, insoluble in ethanol.

Usage

1. Low sodium sulfite has stronger reducing ability than general sulfite, and it has the strongest reducing and bleaching properties in sulfite bleach.

2. Widely used in printing and dyeing industry, such as cotton fabric dyeing aid and silk wool fabric bleaching. It is also used in medicine, beneficiation and copperplate printing. The paper industry is used as a bleaching agent. Food-grade products are used as bleaching agents, preservatives and antioxidants.

3. Light industry is used for the bleaching of soap, oil esters and pulp. The chemical industry is used to manufacture carved white powder, sodium thiosulfate, thiourea, thiobenzoic acid, hexaoxane (medicine), synthetic dyes, and also used in copperplate printing and analytical reagents.

4. In the printing and dyeing industry, it is used as reducing agent, bleaching agent for silk and wool.