Can the PPA plastic series maintain low warpage under high temperature and high humidity?

The PPA plastic series can indeed maintain low warpage under high temperature and high humidity conditions. Its excellent dimensional stability stems from the low water absorption of the material itself (the water absorption rate is only 0.3%-0.6%, which is much lower than that of ordinary nylon). Even under high temperature and high humidity conditions, the dimensional change after water absorption is less than 1%, which significantly reduces the expansion or shrinkage deformation caused by water penetration. In addition, the molecular structure design of PPA enables it to maintain high rigidity and high strength at high temperatures. For example, the bending modulus of PPA resin reinforced with 45% glass fiber exceeds 13786MPa. This rigid support effectively inhibits the deformation tendency of the material under thermal stress. In terms of processing technology, PPA injection molding requires a mold temperature of at least 135°C to promote complete crystallization, thereby optimizing the distribution of crystallinity and reducing the warpage problem caused by uneven internal stress; some modified grades (such as mineral filler grade PPA) further reduce the shrinkage rate and improve dimensional accuracy by adding reinforcing materials. In practical applications, PPA has been widely used in precision parts such as automotive sensor housings and connectors. These parts can maintain stable shape even when exposed to the high temperature and oily environment of the engine compartment for a long time, verifying the reliability of its low warpage.