Plastics are polymeric materials, a material built up from long repeating chains of molecules. Polymers such as rubber occur naturally, but it wasn't until the development of synthetic polymers around 1910 that the polymers tailored to the needs of the engineer first started to appear. One of the first developed was Bakelite and was used for the casing of early radios. During the Second World War, plastics such as polyethylene were used as a replacement material for other materials in short supply. Because the early plastics were not completely chemically stable, they gained a reputation for being cheap and unreliable. However, advances in since then, mean that plastics are a very important and reliable class of materials for product design.Plastic packaging has become indispensable to the world. A global trend has emerged to produce hi-tech, sophisticated and eye-catching plastic packaging. PET preforms manufacturers has recorded the fastest growth rate in the global plastics market.
The mechanical properties of polymeric materials tend to be inferior to most metals. Because of this, careful consideration must be given to using plastics for structural applications. Fibre reinforced plastics are extensively used where the mechanical properties of the base plastic material are not sufficient. However because of their relatively low weight, the ability to color the plastics when manufacturing, and the ability to mold complex shapes relatively easily, plastics are extensively used for product casings and other applications where mechanical strength is not at a premium. PET preforms manufacturers in india has recorded the fastest growth rate in the global plastics market.
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