Delivering Fluid Sealing Solutions Since 1972

PTFE O Rings

The UK’s largest independent stockist and distributor of PTFE O Rings

M Barnwell Services range of PTFE O Rings are an essential component for applications involving friction, temperature and chemicals. Standard sizes are available from stock and special / custom cut sizes are obtainable with industry-leading lead times.

For over 50 years we have supplied OEM’s, end-users, and Aftermarket suppliers with PTFE O Rings which are proven to help resist corrosion, extend shelf-life and function in a wide range of temperatures. Together with our manufacturing partners we can also provide full batch traceability throughout the manufacturing process and issue any conformance/certification when available.

For more information, please contact our team of seal experts.

ptfe o rings

For some industrial applications, PTFE (Polytetrafluoroethylene) is the go-to sealing solution. These include:

PTFE provides outstanding weathering and ozone resistance which are ideal for static radial applications when sealing fluids and a variety of dynamic applications. To find out the difference between Teflon™ and PTFE as well as understand the main characteristics of PTFE as a material visit the PTFE overview page.

In addition to PTFE O Rings M Barnwell Services also provide a full range of other popular PTFE sealing products. These include:

If you would like more information about our range of PTFE Seals, contact a member of the team.

M Barnwell Services also provides a range of PS Seal® from Garlock, and a bespoke kit labeling service. Visit the Kit Branding and Packaging page for more information.


O Rings - No limitation to dimensions with over 10,000 different sizes available from stock

Temperature Range

Between -185°C and +250°C (intermittent/compound-specific between -200°C and +260°C)
Melting point at approximately +327°C


O Rings - British Imperial (BS1806) and Metric (BS4518). European Metric (ISO 3601), including German (DIN 3771), Swedish (SMS 1586/1588) and French (NFT 47 501). American (SAE, AMS, AS568) and Japanese Metric (JISB 2401).


General O Ring- WRC, WRAS, FDA, EC1935/2004 & EC2023/2006, DVGW, KTW, BGVV, KIWA, USP Class VI, NSF, ACS, EU2002/72, EN681-1, EN549, 3A Sanitary, NORSOK and EN682