PTFE Seals

About this product

Polytetrafluoroethylene (PTFE) is one of the most versatile and reliable sealing materials available today. Its unique combination of properties makes it the preferred choice wherever elastomers and standard plastics reach their limits.

What this means for you: longer equipment lifetime, fewer breakdowns, and safer operation under the harshest conditions.

Virgin PTFE exhibits inherent limitations in wear resistance and elastic recovery. To overcome these constraints, Angst+Pfister engineers formulate advanced PTFE compounds incorporating fillers such as bronze, graphite, carbon fiber, or glass fiber. These reinforced materials demonstrate substantially improved mechanical strength, wear resistance, and extrusion resistance, thereby ensuring reliable sealing performance under elevated pressures, chemically aggressive media, and extreme thermal conditions. Furthermore, specific PTFE compound grades are gentle on mating surfaces, allowing the use of unhardened counter-surfaces such as stainless steel without the risk of damage.

PTFE seals from Angst+Pfister are trusted wherever performance cannot be compromised:

Oil & Gas – delivering reliable performance in drilling, exploration, and refining applications

Choosing PTFE is just the beginning. With more than 100 years of engineering excellence, Angst+Pfister provides:

Hydraulic & Pneumatic Cylinders – ensuring low friction and extended service life in heavy-duty use

Not all PTFE is the same. To meet the widest range of application requirements, Angst+Pfister has developed a comprehensive portfolio of PTFE compounds. By adding carefully selected fillers – such as bronze, graphite, carbon fiber or glass fiber – we can significantly improve wear resistance, extrusion resistance, pressure resistance, and overall durability.

Virgin PTFE offers excellent chemical resistance and low friction, but it can lack strength under demanding conditions. Our compounds solve this by combining PTFE with advanced fillers to:

Result: A PTFE seal that is precisely matched to your industry, your medium, and your operating conditions.

Proper handling during assembly is crucial, as PTFE is sensitive to surface damage. The quality of the mating surface is also critical, particularly in terms of roughness:

The overview table here shows how different fillers enhance the properties of PTFE. This helps you identify the most suitable material for your application – whether you need maximum chemical resistance, extreme wear protection, or compliance with strict food & pharma regulations.

For detailed guidance, our engineers are available to help define the optimal compound and design for your project.

Discover our PTFE compound portfolio and find the right grade for your sealing challenge.

Because PTFE is not elastic, seals must be combined with an energizing component to ensure reliable sealing. Two main concepts are used:

• Value oriented solution for general applications that do not require PTFE seals

V-spring seals can be silicone-filled to comply with hygienic design requirements.

• Metal springs (various stainless steels) ensure elasticity even under extreme conditions

Canted Coil Spring (W-Spring) • Nearly constant spring load across a wide deflection range • Designed for dynamic sealing • Available in low, medium, and high load configurations • Suitable for small seal diameters • Used in similar applications as the cantilever spring

Explore our Standard PTFE Piston and Rod Seal designs – ready to use or customizable to your specifications.

Spring energized seals can be manufactured with an extended heel to increase extrusion resistance in very high-pressure conditions.

As option, GRP, TGRP, SGRP and SSP can be manufactured in Light or Heavy series.

For GRP, LRP, DDP and VSP100 please contact our Sales Organization for sizes available on stock.

As option, GRR, TGRR, SGRR and SSR can be manufactured in Light or Heavy series.

For SSR, LRC, DDR and VSR100 please contact our Sales Organization for sizes available on stock.

Source: Angst+Pfister brochure "PTFE Seals Catalogue", https://www.angst-pfister.com/dam/jcr:89afc4c0-2686-4bd5-8758-c1c391270fa3/APGroup_PTFE Seals for dynamic Applications_ENGL_web-ES 1.pdf