Melting temperature is a very important process parameter in PVC processing. If this parameter is not proper, it will lead to material decomposition. The flow characteristics of PVC are quite poor, and its process range is very narrow. In particular, high molecular weight PVC materials are more difficult to process (this material usually needs to add lubricants to improve the flow characteristics), so small molecular weight PVC materials are usually used. The shrinkage of PVC is very low, generally 0.2 ~ 0.6%.<BR>
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