2PbO.Pb (C17H35COO)2 ; MW = 1219.87; MP = 115 – 117*C CAS No. 56189-09-4 Dibasic Lead Stearate, 2PbO, Pb(C17H35COO)2 is basic lead soap of commercial stearic acid. These are versatile combined lubricants and heat stabilizers for PVC. It helps to provide lubrication, particularly on the surface of machines working at high temperature and speeds. There is much less likelihood of migration or blooming occurring than with other metallic stearates. Di Basic Lead Stearate has a fairly low refractive index, and when used alone in P.V.C. has a low pigmenting value, producing a translucent product. It is suitable for both translucent and coloured compounds. It acts as a stabilizer lubricant, permitting increased rates of production by reducing friction. It is often used in conjunction with other metallic stearates, where it exhibits a greater efficiency as a heat stabilizer because of the synergistic effect.