The thermo non-oxidative degradation of PVC and the effects of alkaline earth metal (Be, Mg, Ca, Ba) stearates were studied
by thermogravimetry in the temperature range 150 to 500°C. The alkaline earth metal stearates were observed effectively reduce
the dehydrochlorination of PVC. The synergistic effects of combinations of these salts with lead stearate were also studied
and are discussed. Kinetic parameters such as the activation energy, order of reaction and Arrhenius factor were calculated
by the Coats and Horowitz methods. The results showed that these metal stearates increase the activation energy required for
the dehydrochlorination of PVC.