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The characteristic of EPP material EPP material is a kind of polypropylene after expanding, it consists of gas and solid. Usually it is granular presenting black, pink or white. Its diameter is usually at the range of φ2 7 mm. EPP bead’s extine is closed filled with gas in it. The solid part only occupies 2%-10% of the total weight,the rest is gas. It is the characteristic of EPP as follows: 1low density, Customers can choose different density of bubble raw materials according to different mold needs. 2high quality of temperature endurance, it can tolerate the temperature from -40°C to 130°C,it can bear even large scope of the temperature changing in a short time. 3good quality of cushioning property. Even in the cushion layer not thick circumstance also can have very good buffer action 4it is totally recyclable. Comparing with other materials, EPP is pure hydrocarbon without any chemicals non-recyclable such as plasticizer or foaming agent and so on. So after heating can negate, burning left after only water and carbon dioxide. Even in 100 °C under spray test, but also meet the requirements of environmental protection laws and regulations. Moreover, when the EPP with other polypropylene film, such as in PP injection skeleton, such as fabrics TPO unifies in together, also can realize the so-called "material integration system", namely the system being recycled not need decomposition. Based on the above characteristics makes the EPP very suitable for automobile manufacturing with the needs of safety, environmental protection, weight Therefore, since the 1990's, EPP is rapidly used in automotive manufacturing in a wide range of applications, being the new material in automobile industry, its potential application are very wide. Many of the cars at home and abroad use EPP materials as buffer energy-absorbing component, it is used as a bumper core, side guard board, door panel suction protecting mat, cushion, , sunshading board, tool box, etc. pictures show the EPP in car on the typical application.