Polyplastics Co., Ltd., a leading global supplier of engineering thermoplastics, has completed an extensive study confirming the feasibility of polyphenylene sulfide (PPS) for bump- of automotive engine cooling systems. Polyplastics' linear DURAFIDE (R) PPS, which already delivers superior performance over rivals such as nylon 66, now has bump-off modeling capabilities to prevent deburring.

The "bump-off" modeling results in a lower cut that "collides" in two directions and ejects from the mold without the use of a sliding structure. The line of separation (burr of the mold) disappears, allowing a mold without burrs. Prior to this, the PPS had limited use in "bump-off" modeling of engineering parts because of its fragility.

Polyplastics has found that materials with high bending fracture toughness in high temperature environments (150C for PPS) are suitable for bump-offs in terms of both damage and deformation. The company also noted that improvements in fracture toughness in high temperature environments are possible by reducing fillers, adding elastomer and using high molecular weight PPS.

Polyplastics has shown that linear PPS exhibits higher fracture toughness than cross-linked PPS and is more conducive to bump-off molding. Polyplastics' DURAFIDE PPS appears to be suitable for bump-offs from the point of view of resistance in high temperature environments. Among DURAFIDE PPS materials, 1130A1 (GF30%) and 1140A1 (GF40%) of high molecular weight appear to be useful for bump-offs.

Polyplastics believes that DURAFIDE PPS boosts product reliability and that bump-offs reduce the burr removal process, facilitating greater design freedom. DURAFIDE PPS also delivers high heat resistance with a continuous service temperature of 200C to 240C. It also offers higher chemical resistance compared to fluoropolymers, as well as greater dimensional stability and water absorption / reduced hydrolysis compared to nylon 66.

 

Source: prnewswire.com

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