PPS (Polyphenylene Sulfide) is a crystalline engineering plastic with high temperature and chemical resistance, ideal for fasteners in harsh environments. PPS+GF is PPS reinforced with glass fiber (GF), offering higher rigidity, dimensional stability, and heat resistance—well-suited for high-load and precision positioning applications.

 PPS+GF: Higher tensile strength, heat resistance, and dimensional accuracy, but slightly lower toughness. Care should be taken during machining or installation to avoid excessive impact.
 Unfilled PPS: Better toughness, making it suitable for repeated assembly/disassembly and precision components requiring flexibility.

Both can operate continuously at 200–220°C and withstand short-term peaks up to 260°C. The addition of GF reduces thermal expansion, giving PPS+GF screws superior dimensional stability under high temperatures.

The dense molecular structure of PPS acts like a protective shield, preventing acids, bases, salt solutions, alcohols, oils, detergents, and most industrial solvents from penetrating or degrading it. Only very strong corrosive agents at high temperatures (e.g., concentrated sulfuric or nitric acid) may cause damage, making PPS ideal for long-term use in corrosive environments.

 Semiconductor etching fixtures
 Chemical pumps and valves
 Steam and boiler systems
 Vacuum and cleanroom equipment
 Precision electronics assembly
 Automotive engine compartment components

Glass fiber reinforcement greatly reduces thermal expansion and contraction, meaning PPS+GF screws maintain size consistency across temperature changes. This ensures long-term stability in fastened structures, critical for optical devices and semiconductor equipment requiring precise alignment.

PPS has low outgassing and minimal particle generation, meeting the cleanliness requirements of semiconductor, optoelectronics, and medical applications. For the most particle-sensitive areas, unfilled PPS screws are recommended.

In Class 100 or higher cleanrooms, extremely fine glass fiber particles may be released from machining or friction surfaces. Using fully injection-molded PPS+GF screws helps reduce this risk. For load-bearing and structural fixation, PPS+GF is acceptable, but for core contamination-sensitive zones, unfilled PPS screws are preferred.

In etching and heat-treatment processes, PPS+GF screws provide both chemical resistance and dimensional stability at high temperatures. Once fastened, they maintain tightness and stability over long periods, ensuring reliable performance.

 PPS: Lower creep rate than most engineering plastics.
 PPS+GF: Even higher rigidity, allowing screws to maintain clamping force under continuous high-temperature load, making them especially suitable for pump flanges and reactor vessel fixation.