Knife Gate Valves Browse All 
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PTFE (Polytetrafluoroethylene) is a high-performance fluoropolymer widely used in valve seats, seals, liners, and coatings due to its exceptional chemical resistance, low friction, and thermal stability.
Properties
- Exceptional Chemical Resistance – Inert to acids, bases, solvents, and corrosive chemicals.
- Low Friction & Self-Lubricating – Reduces wear, galling, and sticking, ideal for low-torque valve operation.
- Wide Temperature Range – Can operate from -200°C to 260°C (-328°F to 500°F).
- Non-Stick & Non-Wetting – Prevents buildup of deposits, scale, and contaminants.
- Excellent Electrical Insulation – Provides high dielectric strength for electrically insulated valve components.
PTFE vs. Other Materials
• More chemical-resistant than elastomers (EPDM, NBR)
• Lower friction than metallic seals (Stellite, stainless steel)
• Less wear-resistant than PEEK or UHMWPE in high-load conditions
Limitations
- Limited Mechanical Strength – Soft and can deform under high pressure (cold flow).
- Not Suitable for High Loads or Abrasion – Needs fillers for reinforcement in high-wear applications.
- Limited High-Temperature Use – Begins to degrade above 260°C (500°F).
Common Applications
Chemical Processing Valves – Used for seats, liners, and seals in valves handling aggressive chemicals (acid, alkali, solvent-resistant valves).
Food & Pharmaceutical Valves – Versions of PTFE are available that offer compliance with FDA, USDA, and USP Class VI standards for sanitary applications.
Cryogenic Valves – Used for seats, and seals in valves exposed to extremely low temperatures.
Oil & Gas Valves – Used in non-lubricated sealing applications to prevent contamination.