The seat material shall be one of the following materials: ethylene-propylene-diene monomer or fluoroelastomer with polytetrafluoroethylene bearing support at the top and bottom.
阀座材料应该是下列材料之一：乙烯-丙烯-二烯系单体或氟橡胶，在顶部和底部配置聚四氟乙烯轴承支撑。
2
And ethylene propylene diene monomer has been in the automotive sealing industry, widely used.
而三元乙丙橡胶已在汽车密封条行业中得到广泛的应用。
3
Results show that the main causes of low induction period of cracked naphtha are the high diene number and low phenol content.