Basic lead phosphite

Basic lead phosphite is a basic lead salt of phosphorous acid used chiefly as a heat stabilizer in polyvinyl chloride plastics.

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Polyvinyl chloride: A chlorine-containing thermoplastic polymer made from vinyl chloride monomers. Basic lead phosphite is added to PVC formulations to limit heat-induced degradation during processing and use.
Phosphorous acid: An inorganic phosphorus oxyacid with formula H₃PO₃, commonly represented as HPO(OH)₂. It is the acid component from which basic lead phosphite salts are formed.
Basic salt: A salt formed by incomplete neutralization of a base, retaining hydroxide or oxide-related basic character. The term distinguishes this material from a neutral lead phosphite salt.
Lead in plastics: The use and occurrence of lead compounds as additives in plastic materials. Basic lead phosphite is one source of lead in stabilized PVC products.
PVC heat stabilizers: Additives that reduce thermal degradation of polyvinyl chloride during processing and service. Basic lead phosphite is one member of this additive class.
Lead(II) oxide: An inorganic compound of lead and oxygen with formula PbO. Basic lead salts can be prepared by combining lead oxide with phosphorous acid.
Lead: A dense, soft post-transition metal with atomic number 82. Lead is the metal component responsible for the compound's toxicity and stabilizer identity.
Lead recycling: The recovery and reuse of lead from discarded products and industrial waste. PVC containing lead stabilizers complicates recycling and material separation.
Lead stabilizers: Lead-containing additives used to stabilize polymers, especially polyvinyl chloride. This salt belongs to the lead-based stabilizer family used in PVC.
Hydrogen chloride: A diatomic gas that dissolves in water to form hydrochloric acid. Heating PVC can release hydrogen chloride, which accelerates further degradation.