1. Polytetrafluoroethylene PTFE (F4)
Applicable media: strong acid, strong alkali, strong oxidant, etc.; operating temperature -200~180℃;
Features: Danfoss valves have excellent chemical stability, high heat resistance, and cold resistance; the friction coefficient is very low, and they are excellent self-lubricating materials, but they have low mechanical properties, poor fluidity, and large thermal expansion.
2. Polyperfluoroethylene propylene FEP (F46)
Applicable media: any organic solvent or reagent, dilute or concentrated inorganic acid, alkali, ketone, aromatic hydrocarbon, chlorinated hydrocarbon, etc.;
Operating temperature: -85～150℃;
Features: The mechanical, electrical properties and chemical stability are basically the same as F4, but its outstanding advantages are high dynamic toughness and excellent weather resistance and radiation resistance.
3. Polytrifluoroethylene PCTEF (F3)
Applicable media: various organic solvents, inorganic corrosive liquids (oxidizing acids);
Operating temperature: -195～120℃;
Features: The heat resistance, electrical properties and chemical stability are second only to F4, and the mechanical strength, creep performance and hardness are better than F4.
4. Polyvinylidene fluoride PVDF (F2)
Applicable media: Resistant to most chemicals and solvents;
Operating temperature: -70~100℃;
Features: The tensile strength and compressive strength are better than F4, and it is resistant to bending, weathering, radiation, light and aging. The biggest feature is good toughness and easy to form.
5. Polypropylene RPP
Applicable media: aqueous solutions of inorganic salts, dilute or concentrated solutions of inorganic acids and alkalis;
Operating temperature: -14～80℃;
Features: One of the lightest plastics, its yield, tensile and compressive strength, and hardness are all better than low-pressure polyethylene, and it has outstanding rigidity; good heat resistance, easy to form, and low-cost. After modification, the dynamic impact, fluidity and bending elastic modulus are improved.