PPS (polyphenylene sulfide) products offer the broadest resistance to chemicals of any advanced engineering plastic. They have no known solvents below 392°F (200°C) and offer inertness to steam, strong bases, fuels and acids. Minimal moisture absorption (see Figure 21) and a very low coefficient of linear thermal expansion, combined with Mitsubishi Chemical Advanced Materials's proprietary stress relieving processes, make these PPS products ideally suited for precise tolerance machined components. In addition, PPS products exhibit excellent electrical characteristics and are inherently flame retardant.
Unlike reinforced PPS products, Techtron® PPS is easily machined to close tolerances. It is ideal for structural applications in corrosive environments or as a PEEK replacement at lower temperatures. Techtron® PPS is off white in color.
Components used in high pressure liquid chromatography are fabricated from Techtron® PPS stock shapes due to its chemical inertness. (Prior materials: PEEK, Stainless Steel, Titanium)
Socket assemblies extensively machined from Techtron PPS plate are used during high power / high speed testing of semiconductor packages. (Prior material: Vespel® PI)
Retaining rings used to retain wafers in chemical-mechanical polishing equipment are fabricated from Techtron® PPS.
This product is the most recognized PPS. It is compression molded and offers better dimensional stability and thermal performance than Techtron® PPS and maintains its strength to above 425°F (220°C).
Precision machined, 40% Glass-reinforced Techtron PPS components allow high efficiency in a broad range of chemical pump environments. (Prior material: Stainless Steel)
This grade is an internally lubricated and carbon fiber reinforced compression molded PPS offering a low coefficient of thermal expansion and uncompromised chemical resistance. It is well suited for and wear applications or when an electrically conductive material is required.
Rings made of Bearing-grade Techtron PPS eliminate galling and corrosion problems in centrifugal mining pumps, and allow closer running clearances -- reducing recirculation and increasing efficiency. (Prior material: Bronze)
Techtron® HPV exhibits excellent wear resistance and a low coefficient of friction. It overcomes the disadvantages of virgin PPS caused by a high coefficient of friction, and of glass fibre reinforced PPS which can cause premature wear of the counterface in moving-part applications.
All Mitsubishi Chemical Advanced Materials-EPP's PPS products offer dimensional stability and strength at moderate temperatures. They are rated for continuous service to 425°F (220°C), but strength and stiffness vary based on temperature and grade. Unreinforced Techtron® PPS is generally not recommended for wear applications. Products like Torlon® PAI or Ketron® PEEK are better selections for high temperature wear applications. When designing with compression molded grades, it is important to note its relatively low elongation and impact strength.