Pb-based Satbilizers
Lead compounds, usually based on a mixture of lead salts, e.g., tribasic lead sulfate or dibasic lead phosphite, and lead soaps, e.g., dibasic or normal lead stearates, have been very cost effective heat stabilizers for many years, and function as HCl absorbers. They are particularly suitable for wire and cable electrical insulation because of their complete nonconductivity and the inert nature of the chloride formed with HCl.
Technical limitations to their use have been opacity and sulfur staining. Their cumulative toxicity has been mainly a concern for worker exposure. Apart from wire and cable, their use has been restricted to PVC-Applications in Europe and Asia.
Non/low dusting products, which include the lead components in a safe handling state, in combination
with lubricants (one-pack), have been available for many years in different product forms – flake, granule, tablet, and dosage packs. These one-packs are tailored to suit the processing technique, primarily extrusion and injection molding, and end-use specification.
