What is Polytetrafluoroethylene (PTFE)?
Aug 18,2025
I. Core Characteristics
Exceptional Chemical Inertness
Resistant to almost all strong acids, alkalis, organic solvents, and oxidizing agents (except for a few media such as molten alkali metals and high-temperature fluorine gas).
Widely used in chemical equipment linings and reactor seals.
Extremely Low Friction Coefficient
Friction coefficient (0.04–0.1) is close to that of ice, making it one of the lowest among known solid materials.
Used in oil-free bearings, guide rail coatings, and non-stick cookware coatings (e.g., Teflon®).
Broad Temperature Resistance
Long-term use: -200°C to +260°C (short-term tolerance up to 300°C).
Suitable for aerospace and ultra-low-temperature laboratory equipment.
Outstanding Dielectric Properties
Low dielectric constant (2.0) and minimal loss, with stable insulation performance in high-frequency environments.
Used in 5G base station high-frequency circuit boards and specialty cable insulation layers.
Hydrophobic and Oleophobic Properties (Anti-Adhesion)
Extremely low surface energy prevents contaminants from adhering.
Applications include medical catheter coatings (reducing thrombus adhesion) and anti-stick components in food machinery.
II. Common Applications
(Note: This section was empty in the original text. If specific applications need to be added, please provide details.)
III. Limitations (Usage Considerations)
Cold Flow (Creep)
Prone to slow deformation under prolonged stress → Requires reinforced design (e.g., metal reinforcement for seals).
Poor Wear Resistance
Low hardness (Shore D50–65) → Fillers (e.g., fiberglass, graphite) must be added for high-wear applications.
High Processing Difficulty
High melting point (327°C) and extremely high melt viscosity → Can only be processed by powder sintering or extrusion molding.
Radiation Sensitivity
Susceptible to degradation under γ-ray or electron beam exposure → Use with caution in nuclear facilities.
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