Diaphragm is key sealing part in Air Brake Chamber to provide brake force by pushing the pushrod in brake chamber through method of transferring pressure. Diaphragm is mainly used in brake system in commercial vehicle, subway and High-Speed rail. Development contract with China High-speed rail (CRRC ) was signed to develop diaphragms in April, 2016. 1、Capable of independent developing compound formula. 2、Diaphragm endurance capability of more than 2 million cycles, can work at -55°C. 3、Diaphragm type ranges from T6 to T44.