dibasic lead phosphite

IndexBest gradeFirst gradeQualified grade AppearanceWhite powder without evident mechanical impurityWhite powder without evident mechanical impurityWhite powder without evident mechanical impurity Lead oxide (PbO), %90.0±1.090.0±1.090.5±1 Phosphorous acid (H3PO3),%11.0±1.011.0±1.010.5±1.5 Heating loss, % ≤0.300.400.6 Screenings(Residue on 75um sieve)0.300.40 0.6 Property: It is white, sweet and toxic powder with specific gravity of 6.94.It can dissolve in hydrochloric acid and nitric acid, but not in water. It will become grey or black at about 200°c and even to yellow at 450°c,but in a good reductibility. As an antioxidant, it has excellent performance of resistance to ultraviolet ray, cold, and ageing.Application: Mainly used as the stabilizer of the PVC opaque products because of good insulation, weatherability and ultraviolet radiation absorbency As heat stabilizer in Polyvinyl chloride copolymer, Besides as the acid acceptor and also as antioxidant and shielding ultraviolet ability. Has good thermal stability and electrical insulation, mainly for opaque hard and soft products, especially for outdoors products