Introduction To Materials For Anti-corrosion Valves

Lined Valve
Polytetrafluoroethylene PTFE (F4)
Applicable media: strong acid, strong alkali, strong oxidant, organic solvent, etc. Working temperature: ≤180℃
Features: It has excellent chemical stability, high heat resistance and cold resistance; low friction coefficient, is an excellent self-lubricating material, poor fluidity and large thermal expansion. Its unique properties are unmatched by other materials, so polytetrafluoroethylene is known as the "King of Plastics" and is the most corrosion-resistant material in the world today.
Soluble polytetrafluoroethylene (PFA)
Applicable media: strong acid, strong alkali, strong oxidant, organic solvent, etc. Working temperature: ≤180℃
Features: It is a new type of fluorine-containing resin similar to F46. It is a new variety developed to overcome the difficulty of polytetrafluoroethylene processing and molding, and fully maintains the excellent properties of polytetrafluoroethylene. Good mechanical and electrical insulation properties, outstanding heat resistance and low friction coefficient, flame retardant, low smoke, and good atmospheric resistance. The biggest advantage is that it is relatively easy to mold and process.

FEP (F46)
Applicable media: any organic solvent or reagent, dilute or inorganic acid, alcohol, ketone, aromatic hydrocarbon, chlorinated hydrocarbon, etc. Working temperature: ≤180℃
Features: mechanical, electrical properties and chemical stability are basically the same as F4, but the outstanding advantage is high impact toughness, even the notched specimen cannot be broken, it has excellent weather resistance and radiation resistance, and is easy to form and process. It is a fluorine-containing resin developed to overcome the difficulties in forming and processing polytetrafluoroethylene. Except for the use temperature lower than F4, the other properties of polytetrafluoroethylene are maintained.

Polychlorotrifluoroethylene PCTFE (F3)
Applicable media: various organic solvents, inorganic corrosive liquids (oxidizing acids). Working temperature: ≤120℃
Features: heat resistance, electrical properties and chemical stability are second only to F4, and mechanical strength, creep resistance and hardness are better than F4.

Polyvinylidene fluoride PVDF (F2)
Applicable media: resistant to most chemicals and solvents. Working temperature: ≤120℃
Features: better tensile strength and compression strength than F4, good bending resistance and cold flow resistance; weather resistance, radiation resistance, light resistance and aging resistance, etc. The biggest features are strong bonding force, good toughness and easy molding.

Modified polypropylene (GXPP)
Applicable media: aqueous solution of inorganic salts, dilute or concentrated solution of inorganic acids and alkalis. Working temperature: ≤100℃
Features: It is one of the lightest plastics, its yield, tensile and compression strength, hardness are better than low-pressure polyethylene, it has outstanding rigidity, good heat resistance, easy molding and low price. After modification, the impact resistance, fluidity and flexural elastic modulus are improved.

Modified polyolefin (GXPO)
Applicable media: various concentrations of acids, alkalis and salts and certain organic solvents. Working temperature: ≤110℃
It is currently the most ideal anti-corrosion, anti-static, non-toxic and high-strength high-quality material in the world. It has been widely used in large-scale rotational molding equipment and valves, pipelines as lining. Widely used in chemical, metallurgical, food, transportation, medicine, textile and other industries.

Polyvinyl chloride (rigid) PVC
Applicable media: water-resistant, concentrated alkali, non-oxidizing acid, chain hydrocarbon, oil and ozone, etc. Working temperature: ≤60℃
Features: high mechanical strength, excellent chemical stability and dielectric properties, excellent oil resistance and aging resistance, easy to weld and bond, low price.

Ultra-high molecular weight polyethylene (UHMW-PE)
Applicable media: resistant to various corrosive media (acids, alkalis, salts, but oxidizing acids except) and organic solvents. Working temperature: ≤100℃
Features: outstanding wear resistance, low friction coefficient and self-lubrication; excellent stress cracking resistance, high temperature creep resistance and low temperature resistance; excellent tensile strength, extremely high impact strength. It has excellent chemical stability and fatigue resistance; no surface adsorption, excellent electrical insulation; non-toxic and other excellent comprehensive properties.

Glass fiber reinforced plastic (phenolic) FRP
Applicable media: organic solvents, heat-resistant oils, acids and salt water. Working temperature: ≤120℃
Features: high mechanical properties, extremely low friction coefficient under water lubrication, good electrical properties and low resistance to acid and alkali corrosion, not easy to deform due to changes in temperature and humidity, easy to form, and low price.