1 crystal material, moisture absorption, prone to melt fracture, long-term contact with hot metal and easily decomposed. 
 (2) liquidity is good, but a large contraction of the range and shrinkage, prone to shrinkage. Dented, deformed. 
 3 cooling speed, pouring and cooling system, cooling system should be slow, and pay attention to control the molding temperature expected lower direction of the direction of apparent temperature low temperature is particularly evident when high-pressure, mold temperature is below 50 degrees, the plastic is not smooth, easy to produce poor welding, traces of 90 degrees prone to warpage 
 4 plastic wall thickness to be uniform to avoid the lack of plastic, sharp corners to prevent stress concentration. 

 (1) PP Thai Food supply level 1126NK (film); food grade 1100NK (container), 1102NK; 
 (2) supply of food grade PP transparent Singapore FC9413L (U.S. FDA standards, food packaging, coating level); 
 (3) South Korea's supply of high transparent PP food grade H1500, DJ-570S (Korea Hunan); 
 South Korea's Samsung Fire supply PP-level FB51, FB51R (V2); FB53, FH44 (VO); general level BJ730, HJ730, J700; 
 High rigidity high toughness EP332K; high impact grade 440; drawing class 5014 (for fishing nets, ropes, tied belay); 
 (4) supply of PP units Fuju 6331, K1011, 3080,1120 (transparent food grade FDA approved); 7633,7533 (high impact); 
 High transparency ST611M, ST868M; heat high rigidity ST242, SI4301; high rigidity high impact flame retardant PJ3040; 
 Supply PP Formosa 5090T (high transparent food grade FDA approved); 3015 (15% glass fiber reinforced grade); 
 5) supply Sinopec Maoming drawing PP injection grade T-30S; T-36F, EPT30R; fiber grade Z30S, V30G; 
 Sinopec Hainan drawing supply PP injection grade T-30S; fiber grade Z30S, V30G; 3510 005-2006 (2007); 
 (6) Saudi Basic Industries Corporation supply PP-level drawing 500P (woven, carpet); injection molding grade 575P, 570P; 
 (7) Supply PP Japan: 131,141, W531A; 
 (8) Indian film supply PP-level 100EY; 

 (9) increases the supply of PP fiber modified fireproof material;