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Polyvinylchloride (PVC) is one of the lowest cost, highest volume
commodity resins used today due to its excellent chemical and mechanical
properties. PVC is used in all major fabrication processes such as
extrusion, calendering, injection molding and blow molding.
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PVC is unstable at process temperatures and may degrade rapidly if no
thermal stabilizer is added. As processing conditions greatly influence the
degradation of PVC, any additive that can interfer with PVC gelation,
overheating, friction between polymer chains or metal surfaces may have an
indirect effect on degradation, that is the case of Process aids and lubricants.
The use of thermal stabilizers in PVC formulation is essential to:
prevent dehydrochlorination of PVC
prevent discoloration of PVC (yellowing, blackening, crosslinking,...)
process PVC at high temperatures as well as to provide to the material the
necessary stabilization required for ultimate application.
Acting mainly as agents able to prevent the loss of hydrochloric acid and able to neutralize it if ever formed, the choice of a thermal stabilizer is lead by the application requirements (transparency, food contact,
weatherability,...)
Three main families of stabilizers are available on the market among which, tin stabilizers are considered to be the most efficient ones, that can be used in a wide variety of applications.
In this Tin Stabilizers Center, we are explaining
what happening during PVC degradation, what is the mechanism of action of
Tin Stabilizers and what are their benefits.
An application guide by products or by applications will also help you in making the right choice for your specific application.
If
you need fast and efficient assistance for your problems with PVC
stabilisation, you are welcome to use TechDirect, our free technical
assistance provided with the help of an expert in the field of PVC
processing aids. With TechDirect, you will rapidly get solution to your
problem.
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