What is PPS?

PPS (Polyphenylene Sulfide) resin is classified as a super engineering plastic, featuring a high melting point of approximately 280°C, excellent chemical resistance, and self-extinguishing properties. However, PPS resin is also known for its tendency to generate burrs and gas during the molding process.
To accommodate PPS resin molding, our company has equipped our injection molding machines (ranging from 15 tons to 100 tons) with high corrosion- and wear-resistant screws and cylinders. We also have extensive experience in using PPS resins reinforced with GF30–40% from various resin manufacturers.

During molding, we pay close attention to the position and depth of gas vents to suppress burr formation and prevent short shots caused by gas accumulation. In particular, crystalline resins with reinforcing materials exhibit high anisotropy (due to the glass fiber content), making it essential to have expertise in keeping gear components within JIGM standards.

Similarly, for complex-shaped parts, anisotropy can make it challenging to maintain dimensions within tolerance limits. Additionally, since PPS resin tends to generate gas easily, mold deposits (MD) can accumulate in gas vents during mass production, leading to defects such as surface roughness (due to glass fiber protrusion) or dimensional inaccuracies. Therefore, proper maintenance frequency management is crucial.