- 材质:橡胶
- 作用:固定密封
- 适用范围:电器
- 品牌:广汉长空
- 型号:10
- 截面形状:矩形
- 性质:耐磨损
- 是否进口:是
- 厚度:10
- 样品或现货:现货
- 是否标准件:标准件
- 使用温度:250
- 使用压力:40
polytetrafluoroethylene (ptfe) is a fluoropolymer discovered by roy j. plunkett (1910–1994) of dupont in 1938. it was introduced as a commercial product in 1946.
ptfe has the lowest coefficient of friction (against polished steel) of any known solid material. it is used as a non-stick coating for pans and other cookware. ptfe is very non-reactive, and so is often used in containers and pipework for reactive chemicals. according to dupont its melting point is 327 °c, but its properties degrade above 260 °c.
other polymers with similar composition are known with the ptfe: fluorinated ethylene-propylene (fep) and perfluoroalkoxy polymer resin (pfa). they retain the useful properties of ptfe of low friction and non-reactivity, but are more easily formable. fep is softer than ptfe and melts at 260 °c; it is highly transparent and resistant to sunlight.
ptfe is either synthesized by the emulsion polymerization of tetrafluoroethylene monomer under pressure, using free-radical catalysts or it may be produced by the direct substitution of hydrogen atoms on polyethylene with fluorine, using polyethylene and fluorine gas at 20 °c
ptfe encapsulation
combines excellent chemical and temperature resistance of ptfe o-rings with elasticity of its core material of viton or silicone. ptfe fep encapsulates (encloses) the core material of either silicone or viton elastomer.
these o-rings are oil resilient and heat resistant. the ptfe fep encapsulation provides sealing effect, and the inner elastomer provides constant pressure of the encapsulation to the sealing surface. good for sealing corrosive fluids. ptfe coating makes them virtually impervious to most solvents and chemicals.
average total shore a hardness:
85-90 shore a silicone core
90-95 shore a viton core
the ptfe fep encapsulation complies with part 177 of title 21 of the food and drug administration's regulations for safe use as articles or components of articles for producing, manufacturing, processing , preparing, treating, packaging, transporting, or holding food in accordance with regulation 177.1550
ptfe encapsulated silicone color is clear with a brick red inner ring.
ptfe encapsulated viton offers greater chemical resistance than silicone. color is clear with a black inner ring.
temperature range: -75° f to +400° f.
meets astm d2000 2be720a14b14e14e34f17.
temperature: -40° to 250° f
color is black.
上海润狮实业有限公司
张
13592451919
泰青路619弄29号
糖果饼干包装机
上海首汉贴带式无痕结合机器
嘉定制药厂无尘车间装修
广州和义宏机械,高压活塞机,活塞机
沃尔夫 光缆opgw 厂家直销
F46/F4/PVDF/PTFE/PFA四氟空心管特氟龙管
供应【上海保鲜柜】上海冷柜品牌|鲜肉柜工厂|
加工双酚A双烯丙基醚_双酚A双烯丙基醚_华鲁精细化工
厂家供应M4*12盘头十字三组合螺丝GB9074.14
罗氏血糖仪湖北总代理,血糖仪,绿森林科技
42 50探水杆注水器
广东厨卫生产商
顺义别墅家庭影院设计价格,欢迎咨询
互联网经营许可 证需要哪些申请材料
深圳义齿假牙激光焊接机首饰激光修边机供应
南京国电南自PSP691UD备用电源自动投切装置
1.5mm进口316L不锈钢球
上海韵兴可携式多功能灭火器厂家直销
河北成品玻璃钢化粪池50立100立小型2立5立等现货销售
淄博超高粘度聚丙烯酰胺 分子量齐全