How to identify good and bad cars and plastic?

How to choose the automobile and plastic, primarily for identification from the following points: 1, see Thickness: Thickness car floor will directly affect its abrasion resistance, good car to glue thickness should be uniform, consistent edge and center thickness of the back The material is moisture-proof insulation, the back layer and the surface are linked closely together. 2, see color: cars and plastic commonly used colors are beige, gray, black, etc., a good car and plastic should be homogeneous, no color, surface pattern consistent. 3, try to feel: to plastic and plastic manufacturers in the production process, should add a certain proportion of filler in plastics, the proportion of filler is added determines the flexibility of the finished product, automotive and plastic of flexibility, not only laying relatively easy, but life is relatively long. Checks can be the first car to cut a small strip of plastic, hand it back and forth up and down a few times to break, if it indicates cracks soon appeared and plastic filler too, belong to inferior products. 4, smell the smell: a good car to glue should be no pungent odor, so as to ensure the physical health of vehicle occupants. 5, vehicle stereolithography: better protection chassis, the version is accurate, smooth and no wrinkles after http://www.btsfqczs.com pavement