What are the fluorine materials for fluorine-lined valves?
1. Polyperfluoroethylene FEP (F46): suitable for any organic solvent or reagent, dilute or concentrated inorganic acid, alkali, ketone, aromatic hydrocarbon, chlorinated hydrocarbon, etc. Use temperature: -85~150. Features: Mechanical, electrical properties and chemical stability are basically the same as F4, but the outstanding advantages are high dynamic impact toughness, excellent weather resistance and radiation. 2. Polytrifluoroethylene PCTEF (F3): suitable for various organic solvents and inorganic corrosive liquids (oxidative acids). Use temperature: -195~120. Features: heat resistance, electrical properties and chemical stability are second only to F4, mechanical strength, creep properties, and hardness are better than F4. 3. Polypropylene RPP: suitable for aqueous solutions of inorganic salts, dilute or concentrated solutions of inorganic acids and alkalis. Use temperature: -14~80. Features: One of the lightest plastics, its yield, tensile and compressive strengths, and hardness are better than low-pressure polyethylene, with outstanding rigidity, good heat resistance, easy to form, and inexpensive. After modification, it has dynamic impact, fluidity, and bending elasticity. 4. Polyvinyl chloride: rigid) PVC: suitable for water resistance, concentrated alkali, non-oxidizing acid, chain hydrocarbon, oil and ozone, etc. Use temperature: 0-55. Features: high mechanical strength, excellent chemical stability and dielectric properties, good oil resistance and aging resistance, easy welding and bonding, low price. 5. Polytetrachloroethylene PTFE (F4): Use medium: strong acid, strong alkali, strong oxidant, etc. Use temperature: -200~180. Features: It has excellent chemical stability, high heat resistance, cold resistance, and low friction coefficient. It is an excellent self-lubricating material, but it has low mechanical properties, poor fluidity and large thermal expansion. 6. Polyvinylidene chloride PVDF (F2): Use medium: resistant to most chemicals and solvents. Use temperature: -70~100. Features: tensile strength and compressive strength are better than F4, bending resistance, weather resistance, radiation resistance. Light resistance and aging, etc., the biggest feature is good toughness, easy to form. 7. Polyolefin PO: suitable for various concentrations of acid-base salts and certain organic solvents. Use temperature: -58~80. Features: It is the most ideal anti-corrosion material in the world at present, and has been widely used in the lining of large-scale equipment and pipe fittings for rotational molding.