By blocking free radical chain reactions, thermal stabilizers can react with free radicals generated during plastic decomposition reactions, thereby blocking the transfer process and stabilizing the plastic material.

Neutralization reaction. Acidic substances will be produced during the decomposition of plastics. At this time, the alkaline substances of the plastic heat stabilizer work and combine with the acidic substances to cause a neutralization reaction to block the damage caused by the acidic substances to the plastic materials.

Stop the degradation reaction. The thermal degradation reaction of some plastic products is to remove HCI gas from the molecular chain, eliminate HCl, and stop the reaction.