The salt spray test chamber is generally used for neutral salt spray test and acid salt spray test. The difference is that the material of the salt spray test box is different. The neutral salt spray test equipment uses PVC plates, and the acid salt spray test uses PP plates. In this chapter, we explain the material of PVC board.
Brief introduction of PVC:
a. PVC scientific name polyvinyl chloride.
b. PVC material has non-flammability, high strength, resistance to climate change and excellent geometric stability.
c. The melting temperature of PVC during processing is a very important process parameter. If this parameter is not correct, it will cause the problem of material decomposition.
d. The shrinkage rate of PVC is quite low, generally 0.2 ~ 0.6%.
The advantages of using PVC board in the salt spray test chamber:
a. PVC materials often add stabilizers, lubricants, auxiliary processing agents, colorants, anti-impact agents and other additives in actual use.
b. Rigid PVC is one of the most widely used plastic materials. PVC material is an amorphous material.
c. PVC has strong resistance to oxidants, reducing agents and strong acids. However, it can be corroded by concentrated oxidizing acids such as concentrated sulfuric acid and concentrated nitric acid and is also not suitable for the occasions in contact with aromatic hydrocarbons and chlorinated hydrocarbons.
d. The flow characteristics of PVC are quite poor, and its process range is very narrow. In particular, PVC materials with large molecular weight are more difficult to process (this kind of material usually needs to add lubricant to improve the flow characteristics), so PVC materials with small molecular weight are usually used.
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