久久综合中文字幕_肉丝袜脚交视频一区二区_91成人免费网站_性做久久久久久久免费看_一区二区三区在线视频观看_欧美精品自拍偷拍_极品美女销魂一区二区三区_亚洲欧美国产高清_欧美日韩高清一区二区_成人av一区二区三区_久久久亚洲欧洲日产国码αv_麻豆成人免费电影_欧美精品乱人伦久久久久久_国产精品网曝门_中文字幕在线播放不卡一区_国产精品久久99

VITON fluorine rubber, rubber containing fluorine in the molecule, depending on the fluorine content, that is, the structure of the monomer, there are various types; high temperature resistance is better than silicone rubber. Chemical resistance, resistance to most oils and solvents (except ketones and esters), weather resistance, ozone resistance are good, but cold resistance is poor; generally used in automobiles, motorcycles, etc. The operating temperature range is -20 ℃ ～ 260 ℃. When low temperature is required, a low temperature resistant type can be used. It can be applied to -40 ℃ and the price is higher.