Excellent chemical and high temperature characteristics of Polytetrafluoroethylene (PTFE), are maintained in reinforced PTFE, and its mechanical strength, stability, electrical and wear resistance properties can be enhanced by adding fillers, for example,
1. Withstand up to 380°C high temperature, the sintering temperature of PTFE products.
2. Does not react with the medium contacted.
3. Excellent mixing features with PTFE resin.
4. Improves wear reslstance, cold flow, thermal conductivity and coefficient of linear of linear expansion of PTFEproducts.
Commonly used fillers are alkali-free wax-free glass fiber, graphite, carbon fiber, MoS2, A1203, CaF2, coke powder and carious metal powders, such as:
1. Filling glass fiber or graphite improves the wear resistance and cold flow resistance
2. Filling molybdenum disulfide (MoS2) improves lubricity
3. Filled copper (Cu), molybdenum (Mo), nickel (Ni), aluminum (Al), silver (Ag), tungsten (W), and iron (Fe) improves thermal conductivity
4. Filled polyimide (PI) or polyphenol ester (POB or PHB) improves wear resistance
5. Filling polyphenylene sulfide ((PPS)) improves creep resistance and ensures dimensional stability
Under the same temperature condition, the filled PTFE has higher compressive strength, compressive modulus, flexural strength, hardness, friction coefficient, wear resistance and thermal conductivity than pure tetrafluoroethylene (TFE), but both tensile strength and elongation are decreased, and the coefficient of linear expansion is also reduced.
