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New DURAFIDE(R) PPS High-Filled: High Toughness Grades With Improved Heat Shock Resistance


New DURAFIDE® PPS High-Filled, High Toughness Grades
With Improved Heat Shock Resistance

Introduction

Polyphenylene sulfide (PPS) resin is a highly heat-resistant resin that is categorized as a super engineering plastic. It exhibits outstanding flame retardancy, mechanical properties, dimensional stability and chemical resistance. PPS demonstrates a high level of chemical resistance comparable to fluororesins, a feature demonstrated by the fact that there is no organic solvent that can dissolve it at temperatures of 200℃ or below. It also exhibits excellent heat resistance, illustrated by a melting point of 280℃ and a continuous service temperature range of 200 – 240℃. As there is none of the hydrolysis that occurs with polyamide resins and polyester resins, excellent long-term reliability is another feature that makes it hugely attractive for product design.

Global demand for PPS resin was estimated to be approximately 100,000 tons in 20161). The automotive sector has seen particularly strong growth in demand in recent years, driven by electronic components for next-generation vehicles (hybrid electric vehicles, electric vehicles, and fuel cell vehicles). There has also been additional demand generated by the substitution of metals used in components, due to downsizing and weight reduction. Here we introduce our efforts to develop new high-filled, high toughness grades with greatly improved heat shock resistance, for which there is a particularly high demand within the automotive sector.



1. Improvement in Heat Shock Resistance

PPS resin is used in a variety of automotive parts, including various types of sensors, power module cases, and switches. In most cases, metal terminals or electrode plates are inserted into these PPS resin parts. As these metal insert parts operate in a variety of thermal environments, heat shock testing (thermal shock testing) is typically required as a form of reliability test. In a heat shock test, the product is placed inside a chamber where it is exposed to a repeated cycle of low (e.g., -40℃) and high ( ……


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