Product Introduction

Appearance: White or slightly yellow crystalline powder, with a faint sulfurous odor。

Molecular Formula: Na2S2O5

Molecular Weight: 192.12

CAS No.: 7681-57-4

UN No.: 3260

DG Class: 8 (腐蚀性) / III

Physical/Chemical Properties: Density 1.48; melting point 150°C (decomposition); water solubility 540 g/L (20°C); pH 3.5–5.0。

Main Applications

• Food industry: bleaching agents, preservatives, antioxidants, color protectants, leavening agents  

• Dyeing and printing: dechlorination agents, cotton scouring auxiliaries, leather processing  

• Pharmaceutical production (chloroform, phenylsulfonamide), rubber coagulant  

• Photographic developing, fragrance/organic synthesis reducing agents

Safety Information

Hazard Symbols: Xn

Hazard Statements: H302 H318

Precautionary Statements: P264 P270 P280 P301+P312 P305+P351+P338 P501

Quality Standard: GB 1893-1998（Food grade Na2S2O5≥95.0%）

Storage & Transport: Store in a cool, dry, well-ventilated place away from incompatible materials. Handle with appropriate PPE. Refer to the Safety Data Sheet (MSDS) for detailed handling, first-aid, fire-fighting and accidental release measures.