PVC plastic properties and applications

- Apr 09, 2017-


PVC plastic properties and applications

Chemical name: PVC

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Typical applications: water pipes, household pipes, housing wall panels, commercial machine shell, electronic products packaging, medical equipment, food packaging and  construction connector.


Injection molding process conditions:

Drying: Drying is usually not required.

Melting temperature: 185 to 205 ° C

Mold temperature: 20 ~ 50 ℃

Injection pressure: up to 1500 bar

Holding pressure: up to 1000bar

 Injection speed: In order to avoid material degradation, generally use a considerable injection speed.

 Runners and gates: All conventional gates are available. If smaller parts are machined, it is advisable to use needle tip gates or submersible gates; for thicker parts, it is best to use fan-shaped gates. The minimum diameter of the needle tip or submersible gate shall be 1 mm; the thickness of the fan gate shall not be less than 1 mm.

 

 Chemical and physical properties: Rigid PVC is one of the most widely used plastic materials. PVC material is a non-crystalline material. PVC materials in the actual using often added stabilizers, lubricants, auxiliary processing agents, colorants, impact agents and other additives. PVC material is non-flammability, high strength, weather resistance and excellent geometric stability. PVC has a strong resistance to oxidants, reducing agents and strong acids. However, it can be strongly oxidized acid such as concentrated sulfuric acid, concentrated nitric acid corrosion and does not apply with aromatic hydrocarbons, chlorinated hydrocarbons in contact with the occasion. PVC melting temperature during processing is very important process parameters, if this parameter will lead to improper decomposition of the material. PVC flow characteristics are quite poor, the process range is very narrow. In particular, large molecular weight PVC materials are more difficult to process (this material is usually added to the lubricant to improve the flow characteristics), so are usually used are small molecular weight PVC material. PVC shrinkage is quite low, generally 0.2 to 0.6%。



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