1、外观是否变形。一般外观变形大的塑料衬板质量不好，说明厂家为了添加母料把乙料加量过大，这种衬垫可能不容易断但不耐用。
1. Whether the appearance is deformed or not. Generally, the quality of plastic liner with large deformations is not good, which indicates that the manufacturer adds too much B in order to add masterbatch. This kind of liner may not be easy to break but not durable.
2、外表光亮度。好的塑料衬板外表面应该像磨砂面一样的平整光滑，但又不像镜子一样的光亮。太光亮说明原料塑化温度比较低或者是加热时温度过高，这样的塑料就没有韧性了，当然表面过于粗糙也是不行的。
2. Exterior brightness. A good plastic liner should be smooth and smooth as a ground surface, but not zhushifen.07858.netjubingxi.07858.netguolvqiy.89ix.com jiezhifab.89ix.comyouxiangy.89ix.comshiyanc.89ix.comas bright as a mirror. Too bright indicates that the plasticizing temperature of raw materials is relatively low or too high when heated, so that the plastics will not have toughness, of course, the surface is too rough is not feasible.
3、观看塑衬的两端。两端应该是锯切面，且还要看两端有无气孔，有气孔当然是很不好的产品。
3. Look at the ends of the plastic lining. Both ends should be sawing face, and also depend on whether there are air holes at both ends, which is of course a very bad product.
4、除非是特除情况，塑料衬板都是模具一次成型的，一般厂家为了掩饰变形过大才会经过再次处理，可想而知质量不会好。
4. Unless it is a special case, plastic liners are moulded at one time. Generally, in order to conceal the large deformation, the manufacturers will undergo re-processing. It is conceivable that the quality will not be good.