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EPS (commonly known as foam or styrofoam) can be made of polystyrene. A thermoplastic material, the foam after heating, per cubic meter volume containing 300 - 00 million independent airtight bubble containing air volume is 98 percent or more, such a structure giving it many characteristics. Since density can be as low as 10-30 kg/m3, it is currently the lightest EPS packaging materials, the higher the load circumstances, such materials will be bending, when the ground by the concussion or fall, he will play a buffer resistance role at the same time, because of the air we have been very small thermal conductivity properties were closed but not in a bubble in the troposphere, EPS is a very excellent thermal insulation properties of the material. In refrigerator, refrigerator, cold storage, and other aspects of widely used, civil construction is also using it as an insulation material.