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Name of Commodity: Phosphorous Acid ITEMS SPECIFICATIONS Appearance White crystal, Faint odour Purity(H3 PO3) %≥ 98.5 Min Phosphate %≤ 0.2 Max Chloride (Cl ) %≤ 0.01 Max Sulphate %≤ 0.008 Max Heavy Metals( as Pb ) %≤ 0.001 Max Iron (Fe) %≤ 0.005 Max Water Solubility test Excellent Synonyms : Orthophosphorous acid; phosphonic acid CAS No: 13598-36-2 IMDG code : 81502 Molecular Formula: H3 PO3 Molecular Weight: 82 Melting poing: 73.6 degree USES : Agriculture TRADE NAME : Phosphorous Acid OTHER NAMES : Orthophosphorous Acid; Phosphorous Trihydroxide.======================================================== This above specification is a common standsrd in our customers. We also have done different specification. If you have any other special request, you can tell me. Our factory can supply for you as your request.