Heat stabilizers are quite important additives used to delay PVC thermal degradation and superficial yellowing during processing due to high temperatures. Chloride Acid (HCL) in gas form, is derived from the latter and acts as catalyst to fasten this degradation process. The right amount must be added to achieve a good product, with ideal mechanical properties and appealing surface.
Tin-based thermal stabilizers have a natural odor which can be controlled by reducing its dosage and/or using it with other co-stabilizers that collectively prevent thermal degradation. Furthermore, due to their high performance, they are usually preferred in rigid PVC and in processes where high compression is exerted, such as in injection and extrusion.
For outdoor applications, there are special grades, as conventional methyl tin is weak against sunlight since it promotes the generation of chromophores, although there are ways to nullify this effect through the addition of other additives.
Even though unit price is high compared to other stabilizers, it usually offers a great performance in relation to cost. Plus, it easily integrates with the PVC matrix.
It’s one of the most common grades in the market due to its great efficiency and cost performance. Great transparency can be achieved and can stand high temperature in rigid formulations. Commonly used in extrusion for pipes, sidings or films. Many grades are available with different tin content.
For those companies formulating PVC, it is important to add this material at the beginning of their mixing process. This product has a strong odor.
⮚ RT-198 – Rigid profiles, sidings, rigid films
⮚ RT-550-M – Flexible profiles and flexible injected parts
⮚ RT-430-M – Rigid and semi-rigid profiles
⮚ RT-435-L – Flexible injected parts
For those companies formulating PVC, it is important to add this material at the beginning of their mixing process. This product has a strong odor.
⮚ RT-977 – PVC pipe accessories
⮚ RT-937 – PVC pipe
⮚ RT-917 – PVC pipe and conduit
⮚ RT-9172 - PVC pipe
These are the ones employed by PVC pipe manufacturers. They perfectly adapt to your needs in terms of cost performance, while taking care of the surface finish. Usually with lower tin content and higher odor but that’s all you need.
This is the preferred alternative for medical and food applications. It is FDA compliant, but their tin content is below a regular methyltin stabilizer. It has enough good performance to process PVC products.
For those companies formulating PVC, it is important to add this material at the beginning of their mixing process. This product has a strong odor.
⮚ OM-710-N – Rigid Film
Chemical Additives is a Mexican company that distributes raw materials for the plastic industry both locally and internationally.
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