The Department of Polymer Auxiliaries, Ferro, Ohio, USA, developed calcium / zinc soap powder thermal stabilizers. Therm-Chek RC376P and Therm-Chek RC377P, an alternative to tribasic lead sulphate for PVC universal cable sheathing materials, these two new lead-free, composite metal soap heat stabilizers are considered as alternatives to traditional lead salt heat stabilizers , Is an environmentally friendly material, but also significantly reduces the cost of formulating the final compound. Ferro's former lead-free thermal stabilizer series is mainly used for high-grade PVC wire and cable products, because lead salt and heat stabilizer prices are relatively low. According to Ferro, Therm-Chek RC376P and Therm-Chek RC377P are price-competitive, lead-free, mixed metal soap heat stabilizers that are environmentally friendly products for the industrial wire and cable market, such as construction, Green alternative. The tribasic lead sulfate has a density of 6.4 g / cm. , While the density of two new products is less than one-third. With low density of the compound, so the final product unit volume with compound quality and low cost.