Advancing with the times, the pace of the times is becoming more and more compact, people's pursuit of material and spiritual aspects is getting higher and higher, and the environmental test equipment industry is certainly not behind. The progress of the salt spray corrosion test chamber is a testimony, from the first Generation of FRP (glass reinforced plastic) material to the second generation of PVC board and then to today's PP board material.
The first generation of salt spray corrosion test chamber is made of FRP, also known as FRP, which is a fiber-reinforced plastic. Light and hard, non-conductive, stable performance. High mechanical strength, low recycling, corrosion resistance. Machine parts and automobiles, ship casings, etc. can be manufactured instead of steel.
The second generation salt spray corrosion test box is made of PVC board, which is a vacuum plastic film used for surface packaging of various panels, so it is also called decorative film, adhesive film, used in building materials, packaging, medicine. And many other industries. The building materials industry accounts for the largest proportion, at 60%, followed by the packaging industry, as well as several other small-scale applications. According to the degree of hardness, it can be divided into soft PVC and hard PVC. According to the production process, it can be divided into PVC crust foam board and PVC free foam board.
The third generation, PP board, is a semi-crystalline material. It is harder and has a higher melting point than PE. The softening temperature is 150 ° C. Due to the high crystallinity, the surface stiffness and scratch resistance of this material are very good, and there is no environmental stress cracking problem. The impact resistance is better, and the shrinkage rate of PP is also equivalent due to crystallization. High, generally 1.8~2.5%. And the direction uniformity of shrinkage is much better than materials such as PE-HD. Adding 30% glass additive can reduce the shrinkage to 0.7%. Both homopolymer type and copolymer type PP materials have excellent moisture absorption resistance, acid and alkali corrosion resistance, and solubility resistance. However, they are solvents for aromatic hydrocarbons (such as benzene) and chlorinated hydrocarbons (carbon tetrachloride). Solvents, etc. are not resistant.
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