PP驻极母粒料N95
PP是一种半结晶性材料。它比PE要更坚硬并且有更高的熔点。由于均聚物型的PP温度高于0℃以上时非常脆，因此许多商业的PP材料是加入1~4%乙烯的无规则共聚物或更高比率乙烯含量的钳段式共聚物。共聚物型的PP材料有较低的热扭曲温度（100℃）、更高的透明度、低光泽度、低刚性，但是有有更强的抗冲击强度。PP的冲击强度随着乙烯含量的增加而增大。PP的维卡软化温度为150℃。由于结晶度较高，这种材料的表面刚度和抗划痕特性很好。PP不存在环境应力开裂问题。通常，采用加入玻璃纤维、金属添加剂或热塑橡胶的方法对PP进行改性。
PP的流动率MFR范围在1~40。低MFR的PP材料抗冲击特性较好但延展强度较低。对于相同MFR的材料，共聚物型的冲击强度比均聚物型的要高。由于结晶，PP的收缩率相当高，一般为1.8~2.5%。并且收缩率的方向均匀性比PE-HD等材料要好得多。加入30%的玻璃添加剂可以使收缩率降到0.7%。均聚物型和共聚物型的PP材料都具有优良的抗吸湿性、抗酸碱腐蚀性、抗溶解性。然而，它对芳香烃（如苯）溶剂、氯化烃溶剂等没有抵抗力。PP也不象PE那样在高温下仍具有抗氧化性。
PP plastic use / application examples: film, injection molding,blow molding, extrusion coating, stretching, fiber, sheet, bottlecap / NCR cloth, staple fiber, sheet, filament, BOPP film, IPPfilm, UV stabilized fiber, home appliance accessories, automotiveaccessories, household appliances, advanced Packaging (CPP,advanced packaging (CPP, transparent containers, large containers,ropes, high packaging (BOPP) , bags, , stationery, bottlecaps, fiber packaging, food containers, continuous fiber, Straw,daily necessities, disposable syringes, extrusion molding,printing, vacuum molding, tents, mixing, just as well as cloth PPmolding performance. Good li, but the shrinkage range andshrinkage value, prone to shrinkage. DENTS, deformations. Coolingspeed, pouring system and cooling system should slowly heat, andpay attention to control molding temperature. The direction of lowtemperature is obvious. When the mold temperature is lower than 50degrees, the plastic parts are not smooth, easy to produce badfusion, leaving marks, more than 90 degrees prone to warpagedeformation. 4. Plastic Wall thickness must be uniform, to avoidlack of glue, Sharp Angle, to prevent stressconcentration.