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Products Center >> Sodium metabisulfite
Detail
  • Name: Sodium metabisulfite
  • Molecular Weight: 190.10
  • Synonyms: Dinatriumdisulfit; Disulfito de disodio; Disulfite de disodium; Disodium disulfite; Disodium Salt Py
  • CAS No: 7681-57-4
  • Pakage: 25kg P.P Woven bags, 20MT in the 20’FCL

Molecular Formula: Na2S2O5
Melting Point: 150 C (Decomposes)
Specific Gravity: 1.48
Solubility in Water: Freely soluble (470g/l)
pH: 3.5-5.0
HS Code: 2832100000
Standard Executed: GB1893-1998
 

Item

Specification

 

Food Grade

Tech Grade

Appearance

White To Slightly Yellowish Crystalline Powder

Content

98.0% Min

98.0% Min

SO2

65.0% Min

65.0% Min

Na2S2O4

2.0% Max

2.0% Max

Insolubles In Water

0.05% Max

0.05% Max

Particle Size

85% (Mesh 200)

85% (Mesh 200)

pH

4.5 -5.5

4 -4.6

Fe

5ppm max

5ppm max

Heavy Metal

10 ppm max

 

As

1 ppm max

 

 


Properties:


Sodium Metabisulfite is a white to slightly yellowish crystalline powder with sulfur dioxide odor; readily soluble in water. Sodium metabisulfite containing more than 65.0% SO2 w/w releases sulfur dioxide gas when mixed with water. It forms a bisulfite adduct with aldehyde and with ketones to a sulfonic acid. It is used to purify or isolate aldehydes and ketones.
 


Applications:


1. It is used as an oxygen scavenger to eliminate the dissolved oxygen in waste water and in pipes.
2. Bisulfite is a reductive bleaching agent.
3. It reduces carbonyl and alcohol groups, which function as colorants of the substances.
4. It is used in bleaching mechanical paper pulp, cotton, wool and kaolin clay.
5. Additional applications include as a preservative (antioxidant), a hair waving agent, and Ensiling agent.

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