The chemical-inert, lowest-friction solid material in routine use — PTFE resists essentially every industrial chemistry except molten alkali metals and fluorine gas. The defining material for seals, gaskets, and sliding surfaces in corrosive service. Trade-offs are low mechanical strength, cold-flow (creep under sustained load), and cost.
Resistant to virtually all acids, bases, solvents, and oxidizers. Used as last-resort seal material when everything else degrades.
μ = 0.04 against steel — no other material approaches this. Self-lubricating sliding surfaces.
−200 to +260 °C continuous. Uniquely qualified for cryogenic-to-high-temp applications.
| Element | Content |
|---|---|
| Polytetrafluoroethylene | 100% |
| Typical fillers | Glass, carbon, bronze, MoS₂ (25% filler grades) |
Composition per ASTM D4894. Specific mill test reports (MTR) available on request for production orders.
Under sustained load, PTFE creeps indefinitely — unsuitable for tight-tolerance load-bearing parts. For structural seal service, use 25% glass-filled grade.
Base tensile 31 MPa is inadequate for most machined parts. Filled grades (bronze-filled, glass-filled, MoS2-filled) are usually what gets specified.
PTFE resists adhesives and inks. Etch with sodium-napthalene before bonding. Avoid printed markings — laser-etch instead.
Full DFM review by a mechanical engineer. No automated bot rejection. FOB Ningbo or DDP to your door.