... white crystal Use in synthesis of phosphite salt,plastic stabilizer,pesticide etc. PRODUCT: Phosphorous AcidIdentificationSynonyms:Orthophosphorous ... acid is used in synthesis of phosphite salts, plastic stabilizers, pesticides, water-treatment chemicals, phosphite fertilizers ... ' FCL3) Iron drum or Plastic drum4) For 70% solution, packing is 25kg/plastic pail, 250kg/plastic drum or 1300kg/IBCRisks ...