over, refrigerator door liners etc), consumer goods (lawn and garden equipment such as lawnmower and sprinklers, etc)1. crystalline material, the moisture absorption of small, prone to melting of rupture, long-term contact with the hot metal can decompose.2. good fluidity, but shrink and shrink the scope value, prone to cratering. dents, deformation.3. cooling speed, feed system and slow cooling in the cooling system and control the temperature. melt temperature at the low temperature and high p