Insert Molding / Over Molding

The molecular weight of PCTFE is between 100,000 and 200,000. When the German fluorine atom in the molecular structure, the polymer is chemically inert, with certain temperature resistance, non-hygroscopicity and gas-impermeability. The presence of chlorine atoms in the molecular structure of the polymer has good processing fluidity, transparency and hardness characteristics. Due to the introduction of C-Cl bond in the molecular structure of PCTFE, in addition to heat resistance and chemical inertness slightly worse than PTFE and tetrafluoroethylene-hexafluoropropylene copolymer, the hardness, rigidity and creep resistance are all better. , Permeability, melting point and melt viscosity are relatively low.

The main performance of PCTFE

(1) PCTFE is a crystalline polymer with a crystallinity of 85% to 95%. Its structural feature is that it has both isotactic and syndiotactic configurations. In general, it is in atactic configuration. Good transparency of the product. PCTFE is almost impermeable to moisture, has low air permeability and low water absorption, so it can maintain good insulation even in water.

(2) Mechanical properties The mechanical properties of PCTFE are related to molecular weight and processing conditions, and are closely related to crystallinity. Tensile strength, elastic modulus, bending performance and hardness all increase with the increase of crystallinity.

(3) Thermal performance The melting temperature of PCTFE is 212~217℃, the greater the crystallinity, the higher the melting temperature. The glass transition temperature (Tg) also varies with the degree of crystallinity, generally between 45 and 90 ℃, measured by the dilatometer method is about 50 ℃. If PCTFE is kept at 260~280℃ for a long time, its molecular weight will decrease due to thermal decomposition.

(4) Electrical properties PCTFE molecule has both chlorine atoms with large volume and relatively small electronegativity, and fluorine atoms with relatively small volume and large electronegativity, and the arrangement is asymmetrical, so the molecule has polarity, and its tgδ and medium The electrical constant is not as good as PTFE, and tgδ is greatly affected by temperature and frequency. However, PCTFE has high volume resistivity and dielectric strength.

(5) Chemical resistance The chemical resistance of PCTFE is slightly inferior to PTFE, but it is still better than other plastics.

Industrial application

Corrosion-resistant parts and components on chemical equipment such as pipelines, valves, valve seats, high-pressure sealing packings, gears, bearings, diaphragms, gaskets, linings and coatings for reactors, storage tanks, fans, centrifuges, etc.; high-frequency insulation for electronic instruments , High-frequency cables, coil insulation, etc.; moisture-proof, anti-stick coating