PTFE 669NX 美国杜邦 低摩擦PTFE

DuPont ™ Teflon ® PTFE 669 X is a polytetrafluoroethylene fine powder resin used primarily for paste extrusion. Teflon ® PTFE 669 X offers the excellent combination of properties typical of the Teflon ® fluoropolymer resins:

non-aging characteristics;

chemical inertness to nearly all industrial chemicals and solvents;

exceptional dielectric properties, stable with frequency and temperature;

toughness and flexibility;

low coefficient of friction;

non-stick characteristics;

negligible moisture absorption;

excellent weather resistance;

service temperature up to 260°C (500°F);

useful properties at -240 °C (-400 °F);

moderate stiffness and high ultimate elongation.

 

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烧结工艺：纯PTFE 材料的临界压力在27.5 MPa 左右, PTFE材料的压缩强度随压制压力的升高而减小; 压缩模量随所压制压力的升高而增加。最后确定PTFE 的成型压力为27.5 MPa 。确定的烧结工艺为: 烧结温度380℃, 保温时间4 h , 升温速度200 ℃下80 ℃/ h , 200℃以上60 ℃/ h , 冷却速度为随炉冷却。