Filo Chemical
Sodium Metabisulfite
Na₂S₂O₅

Quality Specifications

Purity
SO₂
Na₂S₂O₃
As
Fe
Pb
Se
Zn
Cu
Amm. AqNO₃

  Grade F/P
98% min
66.0% min  _.
300 ppm max  _.
    1 ppm max
    5 ppm max
    5 ppm max
    5 ppm max
  10 ppm max
  10 ppm max
Passes test  _.

Solution:  200g dissolved in 1 litre of distilled water shows not more than a sight opalescence for grade F/P.

Grade F/P conforms to the requirements of the Food Chemical Codex.  Grade P complies with BSS 3834 and ISO 3267 for Sodium Metabisulfite, Photographic Grade.

Physical Properties

Appearance


Molecular Weight
Decomposition
Density
pH
Solubility in Water

Crystalline, white/off-white powder; pungent sulfur dioxide odor especially when dissolved in water.
190.1
Decomposes on heating
1.48
4.5 (5%)
40% w/w

Packaging

• 55.12# (25 kg) polyethylene lined multi-ply paper sacks
  
• 2204.60# (1000 kg) polethylene lined bulk bags
  

Safety Data

CAS No.  7681-57-4
UN No.