Molecular Structure:

Product description: executive standard: European food grade
molecular weight and molecular formula: K₂S₂O₃=158.25  
CAS number：10117-38-1

Technical index

Test item	Unit	Specification	Test method
K2S2O3	g/100g	96	ISO 5990-1996(E)
K2S2O3	g/100g	≦0.01	spectrophotometry
pH value(diluted with water to 10%)		9.0-10.0	ISO 5990-1996(E)
heavy metal(measured by Pb)	mg/kg	≦ 20	AES
Fe	mg/kg	≦10	AAS
KCl	g/100g	≦ 0.6	IC
sulphate(measured by K2SO4)	g/100g	≦ 0.5	IC

Product usage
The products could be used as dechlorination agent in the production of potassium hydroxide ion-exchange membrane and developing protective agent in photographic industry. It could also be used in the textile fabrics for bleaching, calcium removing reagent in tanning industry and as the preservative for food industry.  

Product package:
25 kg per bag, composite bag lined with plastic bag, or by user's request.