Ammonium Thiosulfate - Solution, Photo Grade

Characteristics:

Ammonium thiosulfate is a clear, slightly alkaline, colorless solution with a distinct ammonia odor.

Properties:
Formula (NH4)2S2O3
Molecular Weight 148.2
Freezing point (58%), °F 37
pH 8.3
Specifications:
  Typical Analysis Specification
Ammonium Thiosulfate ((NH4)2S2O3) 59.1% 56.0-61.0%
Specific gravity 1.336 1.310-1.340
Insoluble matter (Ca, Mg, NH4OH ppt) 0.003% 0.2% max
Alkalinity (NH4OH) 0.6% 0.3%-1.5%
Sulfide (S) < 1 ppm 1 ppm max
Ammonium Sulfite ((NH4)2SO3) 0.5% 0.3-1.0%
Residue after ignition 0.009% 0.1% max
Heavy metals (Pb) < 5 ppm 5 ppm max
Iron (Fe) 1.0 ppm 2.5 ppm max

Note: Meets the Specification requirements of the International Standards Organization (ISO).

Applications:
Photographic industry Solubilizes undeveloped silver halides in the fixing of films and prints.
Containers:
  • Drums, 55 gallon, 600 pounds net
  • Bulk tank cars and trucks
Product Safety Information:

Ammonium thiosulfate may irritate the eyes, nose and throat. Ingestion may be harmful. When heated or mixed with acids, toxic ammonia, sulfur dioxide and hydrogen sulfide are released which may be harmful or deadly if inhaled.

Anyone responsible for the procurement, use or disposal of this product should familiarize himself and those handling the product with the appropriate Safety and handling precautions involved. Such information is outlined in our Material Safety Data Sheet, which may be obtained by contacting Customer Service.

In the event of an emergency with this product, call the 24-hour General Chemical emergency number: (800) 631-8050.


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