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SPI-Chem Sodium Sulfite Anhydrous, 5 lbs. (2.27 kg), CAS #7757-83-7
SPI-Chem Sodium Sulfite Anhydrous, 5 lbs. (2.27 kg), CAS #7757-83-7
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SPI-Chem Sodium Sulfite Anhydrous, 5 lbs. (2.27 kg), CAS #7757-83-7

Item Number 09730-AB
Availability In Stock
Price  $53.06

Chemical Formula: Na2SO3
Appearance: White powder made up of fine crystals
Odor: None
CAS #: 7757-83-7
NIOSH (RTECS) No.: WE2150000
FW: 126.04
Assay: < 98%
M. P.: Decomposes before melting at 593° C/1100° F
Spec. Gravity: 2.633
Solubility in Water: 7-25%
Materials to Avoid: Strong oxidizing agents and acids


5 lbs (2.27 kg)


Note: The powder is irritating to body tissues after prolonged contact and dusts will irritate the nose and throat causing coughing. It may also cause acute allergic reaction in some people. The product in powder form should not be used without adequate ventilation and respiratory protection.

Sodium sulfite anhydrous is available in different grades but SPI offers only the very highest quality grade, and we we guarantee there will be no streaking or residues left so long as negatives are properly washed after fixing.

The main use of SPI-Chem™ sodium sulfite anhydrous around any microscopy laboratory is for the clearing of negatives from Polaroid Type 55 P/N Positive/Negative film.