CAS 7681-57-4 Na2S2O5 Powder For Water Purifier

Basic Information
Place of Origin: Hunan, China
Model Number: Sodium Metabisulfite
Minimum Order Quantity: 25 Ton/20'
Price: Negotiable
Packaging Details: in the woven bag lined with plastic, net wt. 25kgs or 1000kgs bags.
Delivery Time: 20 Days
Payment Terms: L/C; D/P; T/T
Supply Ability: 20000 Ton/per year
Detail Information
Molecular Weight: 190.1065 Form: White Powder
Purity: 96.5% Min Smell: Sulphorous
Application: Water Purifier, Gas Purification Agent,mordant,herbicide; Pesticides. PH-Value: (50 G/l) At 20 °C: 3.5-5.0
Formula: Na2S2O5 Sensitivity: Air & Moisture Sensitive
Density: 1.48 Merck : 14,8638
CAS: 7681-57-4 HS Code: 2832.2000.00
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7681-57-4 Powder


Na2S2O5 Powder


CAS 7681-57-4

Product Description

96.5% Min Sodium Metabisulfite Cas Number:7681-57-4 Powder Used For Water Purifier




Formula Na2S2O5
Molecular Weight 190.1065
CAS 7681-57-4
HS Code 2832.1000.00
Appearance White or Light Brown Powder
Smell Sulphorous
pH-value (50 g/l) at 20 °C 3,5-5,0 Change in condition
Melting range >300 °C
Solubility in / Miscibility with Water at 20 °C 650 g/l
Sensitivity Air & Moisture Sensitive
Density 1.48
Merck 14,8638
Purity 96.5% Min



1.Sodium metabisulfite is used as bleaching agent, preservative, anti-oxidant, color protector and preservative in food industry.

2.Sodium metabisulfite is used in industry for printing and dyeing, organic synthesis, printing, leather making, pharmaceutical and other departments. Used as preservative, bleach and loose agent in food processing.




Item Standard Test Result
Na2S2O5 96.5% MIN 96.57%
SO2 65.4% MIN 65.44%
Fe 0.004% MAX 0.0024%
Pb 0.0018% MAX 0.0009%
Insoluble 0.0002% MAX 0.0002%


Food additive
It is used as a preservative and antioxidant in food.

It may cause allergic reactions in those who are sensitive to sulfites, including respiratory reactions in asthmatics, anaphylaxis, and other allergic reactions in sensitive individuals.

Sodium metabisulfite and potassium metabisulfite are the primary ingredients in Campden tablets, used for wine and beer making.

The acceptable daily intake is up to 0.7 milligrams per kilogram of body weight. Sodium metabisulfite oxidizes in the liver to sulfate which is excreted in the urine.

Sanitization and cleaning agent
It is commonly used in homebrewing and winemaking to sanitize equipment. It is used as a cleaning agent for potable water reverse osmosis membranes in desalination systems. It is also used to remove chloramine from drinking water after treatment.



CAS 7681-57-4 Na2S2O5 Powder For Water Purifier 0CAS 7681-57-4 Na2S2O5 Powder For Water Purifier 1

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