Tosoh Develops PPS Compound With Improved Thermal Shock Resistance

Tokyo, Japan— Tosoh has developed a polyphenylene sulfide (PPS) compound featuring enhanced thermal shock resistance 1 resulting in an 80% improvement over current industry-standard products.

In recent years, growing demand for PPS resins has been forecast in line with the increasing popularity of electric vehicles; and the increasing shift toward the use of materials other than metal with the aim to reduce the weight of automobiles for improved fuel and power consumption. There are many automobile parts such as metal terminal connectors and electrodes that are manufactured through metal insert-molding2, and it is important to improve the thermal shock resistance of these parts made of materials with different shrinkage rates and other properties.

The new product features improved weld strength3 and liquidity, and can be expected to contribute to further reductions in the weight of automobiles through thinning and compounding.

Going forward, the company will begin sample development and is currently considering mass production of the product.

As Japan’s first PPS resin manufacturer, Tosoh will continue to apply its technological capabilities based on years of accumulated knowledge to new product development.

PPS Compound
 (Caption) Part formed through metal insert molding

Definition of terms
1 Thermal shock resistance: Ability to withstand fluctuations between high and low temperatures
2 Metal insert-molding: Process of forming parts by injecting metal into resin mold
3 Weld strength: Strength of fragile parts of product where molten resin flows meet



Tosoh is the parent of the Tosoh Group, which comprises over 100 companies worldwide and a multiethnic workforce of over 12,000 people and generated net sales of ¥822.9 billion (US$7.4 billion at the average rate of ¥110.85 to the US dollar) in fiscal 2018, ended March 31, 2018.


Tosoh is one of the largest chlor-alkali manufacturers in Asia. The company supplies the plastic resins and an array of the basic chemicals that support modern life. Tosoh’s petrochemical operations supply ethylene, polyethylene, and functional polymers, while its advanced materials business serves the global semiconductor, display, and solar industries. Tosoh has also pioneered sophisticated bioscience systems that are used for the monitoring of life-threatening diseases. In addition, Tosoh demonstrates its commitment to a sustainable future in part by manufacturing a variety of eco-products.

Stock Exchange Ticker Symbol: 4042


This document may contain forward-looking statements, including, without limitation, statements concerning product development, objectives, goals, and commercial introductions, which involve certain risks and uncertainties. Forward-looking statements are identified through the use of the word anticipates and other words of similar meaning. Actual results may differ significantly from the results expressed in forward-looking statements.

For more information, please contact


Jeff Markley
International Corporate Development
Tosoh Corporation
Tel: +81 3 5427 5118
Fax: +81 3 5427 5198