铁道车辆制动机的橡胶隔膜在空气制动分配阀中起传递空气压力的作用 ,直接影响制动性能和行车安全.介绍了该产品的研制以及国外同类产品达到的水平 ,在丁腈橡胶耐寒性配方技术上有独到之处“,”The rubber diaphragms used by train brakes could pass the air pressure in the air brake distribution valve, and straightly affected the brake property and running safety. The development of the product made in our own country and the standards of same type of product at abroad were introduced at the same time, it had originality in cold resistance formula of NBR.