PPS

It is known that PPS and glass are both good at hydrolysis resistance. But the interface of glass and PPS is the weak point for a glass reinforced PPS compound during the hydrolysis process. Thanks to good bonding technology, Envalior G4080HR outperforms competitors’ materials. The retention strength is still around 80% of its initial value after 3,000 hours of aging at 135°C.

Due to its highly stable chemical bonds, PPS shows extremely good heat aging performance. The phenylene rings will form a carbon layer during the initial aging process. Later, it will protect the inner layer from oxidizing. It can easily be validated by the heat aging curve, pictured to the right, for G4010T. It is shown that only a limited reduction of tensile strength is observed at 150°C, while there is a bit more reduction at 230°C, yet reduction is still limited. Even after aging at 230°C for 6,000 hours, Xytron G4010T still shows > 60% tensile strength retention.

Since there is no hydrophilic group in the PPS chemical structure, PPS shows almost ZERO moisture absorption. Even if the specimen of G4020DW-FC is soaked in 85°C water for 72 hours, the absorbed water is only 0.2%, which results in a dimension increase by approximately 0.03% in flow direction and 0.05% in transverse direction.

Due to the high stiffness of PPS, Xytron shows very good creep performance even at elevated temperatures. From the G4024T creep curves, pictured to the right, it is shown that there is limited elongation change for 1,000 hours with loading 20Mpa at room temperature. Even at 150°C, elongation is only 0.6% after 1,000 hours with loading 20Mpa.