The stabilizer is the most important additive used in PVC formulations, such that in all formulations of this polymer, one or more types of stabilizers are used.
Pure PVC degrades at high temperatures, exposure to light, or when subjected to high stress, losing its physical and mechanical properties. The thermal degradation of PVC begins with the loss of unstable chlorine and the formation of double bonds in the chain, producing HCI. The formed double bond destabilizes the chlorine in adjacent units, and new unstable chlorines are released from the chain by forming other double bonds, continuing the degradation process. The stabilizer prevents this thermal degradation during processing and allows the melting (gelation) of PVC.
Stabilizers are produced based on metals such as lead, calcium/zinc, tin, barium/cadmium/zinc, barium/lead, and barium/zinc. Lead-based stabilizers remain the most widely used in the PVC industry due to their good performance, cost-effectiveness, and appropriate thermal stability.
The new generation of calcium/zinc stabilizers from Hampar is continuously being developed and has advantages over lead-based stabilizers, especially concerning environmental and health issues. The latest generation of calcium/zinc stabilizers performs well, particularly at lower phr values compared to older calcium/zinc stabilizers.
Hampar in Your Industry
Hampar Company, supported by the technical expertise of Berlocher Germany, assists you in designing and producing high-quality plastic products for various industries by supplying the necessary additives.
