Product Name: Sodium metabisulfite（Tech grade/ food grade）
CAS NO: 7681-57-4
EC NO: 231-673-0
Molecular Formula: Na2S2O5
Molecular weight：190.1
H.S code: 283210 0000
Specifications:

Item	Quality
	Food grade	Tech grade
Purity (Na2S2O5) :%	≥97.5	≥97.0
Sulfur dioxide( SO2):%	≥65.0	≥65.0
Arsenic ( As ):%	≤0.0002	-
Heavy metal (Pb):%	≤0.0005
Iron (Fe) : %	≤0.001	≤0.002
Insol. in water: %	≤0.02	≤0.05
PH-value :	4.0-4.8	4.0-4.8
Note :Meet FCC V and E 223 standard

Appearance: White or light yellow crystal powder
Packing: 25/50/1000/1250kg pp woven bags with pe inner
Uses: Dyeing mordant; Dechlorination agent; Reducing agent and sulfonating agent for chemical industry and medicine; Bamboo, wood and paper fiber bleaching agent, mineral processing agent; Wastewater treatment agent, etc.; Food grade is used as preservative, preservative, bleaching agent, etc.

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