O-Rings by Material
PTFE O-Rings (Teflon®)
PTFE O-rings provide near-universal chemical resistance across an extreme temperature range — from cryogenic to +260 °C. Unlike elastomer O-rings, PTFE seals do not recover elastically, so they require controlled compression in a groove.
Properties
Key Properties
| Property | Value |
|---|---|
| Temperature Range | −200 °C to +260 °C |
| Hardness Range | 55–65 Shore D (not Shore A — PTFE is a rigid plastic, not an elastomer) |
| Resists | Virtually all chemicals, solvents, fuels, acids, bases, steam, cryogenic fluids, oxygen |
| Avoid | Molten alkali metals, elemental fluorine at high temperature. Note: PTFE has no elastic memory — permanent deformation under load (cold flow) |
| Typical Applications | Chemical processing, pharmaceutical, food & beverage, cryogenic, semiconductor, laboratory equipment, aggressive-media valve sealing |
| Available Standards | AS568 dimensions, ISO 3601, FDA 21 CFR 177.1550, EC 1935/2004, USP Class VI |
For a complete material data sheet, see the full PTFE O-Rings material page.
Sizes
Available Sizes
FITCO manufactures PTFE O-Rings in all standard AS568 and metric sizes — from AS568-001 (0.74 mm ID) through AS568-475 (633.48 mm ID), plus metric sizes per ISO 3601, JIS B2401, and BS 1806.
- Standard durometers in stock
- Custom compounds and special durometers on request
- Cord stock available for field-cut rings
- Typical lead time: ex-stock for standard sizes, 2–4 weeks for custom
Resources
Related Pages
Full Material Data
Complete technical data sheet with chemical compatibility, compression set, and physical properties.
O-Ring Size Charts
AS568, Metric, JIS, BS, GB/T size tables with ID, OD, and cross-section dimensions.
Chemical Compatibility
Check material compatibility with your specific fluid or chemical environment.