Injection Moulding Polyphenylene Sulfide (PPS)

Material Description

Polyphenylene Sulfide (PPS) is a high-performance thermoplastic polymer renowned for its exceptional combination of material properties. This crystalline engineering plastic exhibits excellent thermal stability, with a glass transition temperature (Tg) typically exceeding 85°C and a melting point (Tm) above 280°C, rendering it suitable for applications in high-temperature environments. PPS boasts superior chemical resistance, making it impervious to a wide range of acids, bases, and solvents, thereby enhancing its durability and longevity in corrosive environments. Furthermore, PPS exhibits remarkable mechanical properties, featuring high tensile strength, flexural modulus, and excellent dimensional stability, rendering it capable of withstanding demanding mechanical loads while maintaining its structural integrity. Additionally, this material displays outstanding electrical insulating properties, ensuring its applicability in the electronics industry. The inherent flame resistance of PPS is another key advantage, as it meets stringent flammability requirements without the need for additional flame-retardant additives. Its low moisture absorption, low coefficient of linear thermal expansion, and resistance to creep further contribute to its suitability for critical engineering applications, such as automotive components, electrical connectors, and industrial machinery, where stability, durability, and resistance to harsh environments are paramount.

Tensile Yield
Modulus (MPa)
Point (°C)
Coefficient of
(x 10^-6 /°C)
Absorption (%)
1330 - 138070 - 802.3 - 3.6280-3000.21 - 0.321.3 - 1.540 - 700.04 - 0.1

Design Recommendation

Polyphenylene Sulfide (PPS) is a high-performance thermoplastic known for its excellent thermal stability, chemical resistance, and mechanical properties, making it a popular choice for injection molding applications. To optimize the design for injection molding with PPS, it is recommended to carefully consider the part geometry and wall thickness. PPS tends to have a relatively high melt viscosity compared to other thermoplastics, so it is essential to minimize sharp corners and thick sections in the design to prevent issues like sink marks, flow restrictions, and voids. Ensuring a uniform wall thickness and incorporating fillets and radii in the design can aid in achieving a more consistent and defect-free molding process, ultimately enhancing the mechanical and aesthetic properties of the final product. Additionally, given the high melting temperature of PPS, mold and barrel temperatures should be controlled precisely to prevent degradation and ensure proper flow during injection, contributing to the successful production of high-quality PPS components.

Cost Saving Tip

Cost-saving in Polyphenylene Sulfide (PPS) injection molding can be achieved through several strategies. Firstly, optimizing the part design by reducing wall thickness, minimizing undercuts, and eliminating unnecessary features can significantly reduce material usage and cycle times. Additionally, selecting the right PPS grade for the application is crucial, as it can minimize over-engineering and reduce material costs. Efficient mold design is another essential aspect; using multi-cavity molds to increase productivity, implementing conformal cooling channels for faster cooling, and employing hot runner systems to reduce material waste can yield substantial savings. Process optimization through precise temperature and pressure control can help minimize energy consumption and cycle times. Lastly, considering recyclability and regrind usage to reduce waste and material costs is increasingly important in today’s environmentally conscious manufacturing landscape. By implementing these cost-saving techniques, manufacturers can enhance their competitiveness in PPS injection molding while maintaining high-quality parts.