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 OEMs, 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.

Polytetrafluoroethylene (PTFE) rings are circular and closed, featuring an annular cross-section. Similar to elastomer O Rings, their dimensions are defined by the inside diameter (ID) and cord diameter (W). Unlike molded rings, PTFE O Rings are machined, allowing for production in various sizes.

Advantages of PTFE O Rings

Excellent chemical resistance, compatible with the majority of liquids and chemicals, except for liquid alkaline metals and certain fluorine compounds.
Suitable for contact with foodstuffs, pharmaceuticals, and medicinal products.
Physiologically safe, and can be sterilised.
Low friction, no adhesion.
Wide temperature range from approx. – 200°C to + 260°C.
Available for all diameters up to approx. 1,900 mm.

Application by Industry

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

Food Processing (FDA Seals), also compliant with European Regulations EC1935/2004 & EC2023/2006
Hydraulic and Pneumatic Systems
Engineering and Manufacturing Process
Chemical Processing
Pharmaceuticals and Medical Technology

Material

Standard material: Virgin, unfilled PTFE (polytetrafluoroethylene)

PTFE, a partially crystalline thermoplastic, boasts exceptional chemical and thermal resistance. It stands out as the most chemically resistant plastic, suitable for a wide range of applications. While it exhibits slight limitations with molten alkaline metals, elementary fluorine, and certain halogen materials, PTFE remains unchanged when exposed to aging, light, and ozone.

With a water absorption rate of less than 0.01%, PTFE O Rings are ideal for applications where traditional elastomer O Rings fall short in chemical and thermal resilience. Commonly found in the chemical industry, food processing, pharmaceuticals, and medical technology, Teflon™ O Rings serve as static seals, securing connections like flanges and covers.

To understand the main characteristics of PTFE as a material visit the PTFE overview page.

Other PTFE Products

In addition to PTFE O Rings M Barnwell Services also provides 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.

Sizes

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

Standards

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).

Approvals

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