Shanghai, July 12, 2018 — The Dow High-Performance Silicone Business Unit, a global leader in silicones, silicon-based technology and innovation, announced today at ATC's 2nd Automotive Piping System Innovation Technology Summit 2018 that it Introduced the new SILASTIC ™ fluorosilicone rubber (FSR) for automotive turbochargers in China, and demonstrated the results of laboratory tests of this high-performance material compared to traditional fluorocarbon rubber at the summit. The new SILASTIC ™ fluorosilicone rubber (FSR) provides the following key performance enhancements: stronger heat resistance and higher tensile strength to meet automotive engine temperature rise and booster tube pressure requirements. The Dow High Performance Silicones Division will also showcase new products suitable for the turbo tube coextrusion process to improve processability.
Zhejiang Junhe Rubber Technology Co., Ltd., located in Yuyao City, Zhejiang Province, was one of the first Chinese customers to use the new SILASTIC ™ fluorosilicone rubber (FSR). It is a turbocharger for gasoline vehicles produced by Peugeot Citroen (China).
Yang Xinjie, Regional Market Manager for Silicone Elastomers, Greater China, Dow's Performance Silicone Division, said, "As fuel economy and exhaust emission control requirements become more stringent, the temperature of the turbocharged engine intake system applied by customers has risen dramatically. High, which requires high-performance turbocharger tube materials that withstand extreme temperatures and corrosive chemical environments. Dow's High-Performance Silicone Division has greatly improved our fluorosilicone rubber technology. This new SILASTIC ™ material is used for pressurized tube linings. , Now available in China, can help the automotive industry leverage turbocharging technology to improve car sustainability and performance. "
Report on new fluorosilicone rubber
Dr. Shi Qing, Senior Technical Service Manager, Silicone Elastomers Greater China, Dow High-Performance Silicone Business Unit, will hold the 2nd Automotive Piping System Innovation Technology Summit 2018 on July 12th from 17:00 to 17:30 The theme report titled "Dow's Fluorosilicone Rubber for Turbocharger Pipes" was published on the main report. The main content of the report is the test results of SILASTIC ™ fluorosilicone rubber (FSR). High temperature and low temperature resistance, oil resistance, acid and urea resistance, and adhesion to solid rubber (HCR) are compared with fluorocarbon rubber.
Turbo tube requirements are more stringent
Compared to conventional engines, turbocharged diesel and gasoline engines can convert more fuel energy into power, which helps improve fuel efficiency and control emissions. However, the hot-end turbocharger of such engines is exposed to high temperatures of 220 ° C and higher compressed air pressure. In addition, the turbocharger tube must also meet another requirement: oil resistance to engine oil contained in the air stream. Using a fluorinated lining as a barrier can avoid the expansion of the tube wall and possible cracking caused by the contact of the booster tube with the engine oil.
SILASTIC ™ fluorosilicone rubber (FSR) has high temperature resistance and excellent oil resistance for continuous operating temperatures up to 210 ° C and peak temperatures up to 250 ° C. Compared with fluorocarbon rubber, the elongation at break is higher at high temperature (225 ° C) and low temperature (-20 ° C), and the compression deformation performance is stronger at high temperature, and it also has good resistance to acetic acid and urea. This material is suitable for co-extrusion and hand bag processes, and has excellent initial and continuous adhesion to high density rubber (HCR). In contrast, fluorocarbon rubber has a strong initial adhesion to high-density rubber (HCR), but it will quickly decline after only one day of heat aging.
Other potential automotive applications for SILASTIC ™ fluorosilicone include fuel line safety seals, fuel system seals, valves, membranes, o-rings, and gaskets.
To support this innovative technology, Dow's High-Performance Silicones Division has developed an optimized multi-layer coextrusion process for turbocharger tubes to increase production.