Application :
◎Pharmaceutical industry: For the production of chloroform, phenylpropanone and benzaldehyde. Rubber industry as a coagulant.
◎Printing and dyeing industry: used as dechlorination agent after cotton bleaching, cotton cooking agent.
◎Leather industry: Used for leather processing, can make leather soft, full, tough, waterproof, anti-folding, wear and other properties.
◎Chemical industry: Used for the production of hydroxyvanillin, hydroxyamine hydrochloride, etc.
◎Photosensitive industry: used as developer, etc.
◎Food industry: used as preservative, antioxidant, flour improver.
◎Sodium meatabisulfite is used in the process of reducing gold from chlorauric acid (gold dissolved in nitrohydrochloric acid).
Physical and chemical properties:
Appearance | white crystalline powder, odor of sulfur dioxide. |
Odour | It smells of sulfur dioxide |
Solubility | Soluble in water, aqueous solution is acidic. Soluble in glycerol, slightly soluble in ethanol. |
Density | 1.48g/cm3 |
Melting point | 150℃, easily decomposed by moisture |
Oxidation | Oxidation is readily oxidized to sodium sulfate in air. |
Reactivity | It reacts with strong acids and produces sulfur dioxide and its corresponding salts. |
Quality Index:
Food grade sodium metabisulfite
Item | National Standard GB1886.7-2015 | Test value |
Main content ( calculated as Na2S2O5),% | ≥96.5 | ≥97.5 |
Iron content (calculated as Fe),% | ≤0.003 | ≤0.0015 |
Clarity | pass experiments | clarify |
Heavy metal content (calculated as Pb),% | ≤0.0005 | ≤0.0002 |
Arsenic content (calculated as As content),% | ≤0.0001 | ≤0.0001 |
Industrial grade sodium metabisulfite
Item | National Standard HG/T2826-2008 | Test value | |
Top grade | First grade | ||
Main content ( calculated as Na2S2O5),% | ≥96.5 | ≥95.0 | ≥97.0 |
Iron content (calculated as Fe),% | ≤0.005 | ≤0.010 | ≤0.002 |
Water insoluble matter content,% | ≤0.05 | ≤0.05 | ≤0.02 |
Arsenic (as As) content,% | ≤0.0001 | — | ≤0.0001 |
High purity grade sodium metabisulfite
Item | Index |
Main content ( calculated as Na2S2O5),% | ≥98.5 |
Iron content (calculated as Fe),% | ≤0.0008 |
Clarity | clarify |
Water insoluble matter content,% | ≤0.002 |
Heavy metal content (calculated as Pb),% | ≤0.0005 |
Arsenic content (calculated as As),% | ≤0.0001 |
PH value | 4.0~4.6 |
Refined grade sodium metabisulfite
Item | Index |
Main content ( calculated as Na2S2O5),% | ≥98.5 |
NaCl content,% | ≤0.001 |
Iron content (calculated as Fe),% | ≤0.0005 |
Water insoluble matter content,% | ≤0.003 |
Clarity | clarify |
Arsenic (as As) content,% | ≤0.00005 |
Heavy metal content (calculated as Pb),% | ≤0.0005 |
Application :
◎Pharmaceutical industry: For the production of chloroform, phenylpropanone and benzaldehyde. Rubber industry as a coagulant.
◎Printing and dyeing industry: used as dechlorination agent after cotton bleaching, cotton cooking agent.
◎Leather industry: Used for leather processing, can make leather soft, full, tough, waterproof, anti-folding, wear and other properties.
◎Chemical industry: Used for the production of hydroxyvanillin, hydroxyamine hydrochloride, etc.
◎Photosensitive industry: used as developer, etc.
◎Food industry: used as preservative, antioxidant, flour improver.
◎Sodium meatabisulfite is used in the process of reducing gold from chlorauric acid (gold dissolved in nitrohydrochloric acid).
Physical and chemical properties:
Appearance | white crystalline powder, odor of sulfur dioxide. |
Odour | It smells of sulfur dioxide |
Solubility | Soluble in water, aqueous solution is acidic. Soluble in glycerol, slightly soluble in ethanol. |
Density | 1.48g/cm3 |
Melting point | 150℃, easily decomposed by moisture |
Oxidation | Oxidation is readily oxidized to sodium sulfate in air. |
Reactivity | It reacts with strong acids and produces sulfur dioxide and its corresponding salts. |
Quality Index:
Food grade sodium metabisulfite
Item | National Standard GB1886.7-2015 | Test value |
Main content ( calculated as Na2S2O5),% | ≥96.5 | ≥97.5 |
Iron content (calculated as Fe),% | ≤0.003 | ≤0.0015 |
Clarity | pass experiments | clarify |
Heavy metal content (calculated as Pb),% | ≤0.0005 | ≤0.0002 |
Arsenic content (calculated as As content),% | ≤0.0001 | ≤0.0001 |
Industrial grade sodium metabisulfite
Item | National Standard HG/T2826-2008 | Test value | |
Top grade | First grade | ||
Main content ( calculated as Na2S2O5),% | ≥96.5 | ≥95.0 | ≥97.0 |
Iron content (calculated as Fe),% | ≤0.005 | ≤0.010 | ≤0.002 |
Water insoluble matter content,% | ≤0.05 | ≤0.05 | ≤0.02 |
Arsenic (as As) content,% | ≤0.0001 | — | ≤0.0001 |
High purity grade sodium metabisulfite
Item | Index |
Main content ( calculated as Na2S2O5),% | ≥98.5 |
Iron content (calculated as Fe),% | ≤0.0008 |
Clarity | clarify |
Water insoluble matter content,% | ≤0.002 |
Heavy metal content (calculated as Pb),% | ≤0.0005 |
Arsenic content (calculated as As),% | ≤0.0001 |
PH value | 4.0~4.6 |
Refined grade sodium metabisulfite
Item | Index |
Main content ( calculated as Na2S2O5),% | ≥98.5 |
NaCl content,% | ≤0.001 |
Iron content (calculated as Fe),% | ≤0.0005 |
Water insoluble matter content,% | ≤0.003 |
Clarity | clarify |
Arsenic (as As) content,% | ≤0.00005 |
Heavy metal content (calculated as Pb),% | ≤0.0005 |
