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Phosphorous acid (70% solution)

Phosphorous acid (H3PO3, CAS: 13598-36-2 / 10294-56-1) can be supplied as a 70% solution in water. This product’s main applications as a chemical intermediate include crop protection formulations, detergent additives and industrial specialties.

H3PO3 70% solution is the standard grade, which carries the highest concentration possible for guaranteed product stability throughout the year. The product is available in IBCs, steel drums and bulk containers.

Formula: H3PO3

Packaging: Available in bulk (Isotank, tank car), 1000 l IBC (Intermediate Bulk Containers), 200 l PE drums (4 drums per pallet).


CAS Number

Key Benefits

  • A chemical intermediate
  • High purity grade product
  • An easy-to-use solution
  • Suitable packaging formats
  • Unique production capability
  • ISO certified production
  • REACH registered

Physical Properties

Density 20°C, kg/ m³
Approx. 1415


Clear colorless liquid
Assay w/w %
Halogen as Cl– mg/kg
100 Max
Iron mg/kg
10 Max
Orthophosphate w/w %
0.2 Max

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