Delivering Fluid Sealing Solutions Since 1972

Extreme Pressure Seals ASTRA

Astra Seals®  – Extreme Temperature and Extreme Pressure Seals

M Barnwell Services will only partner with the Worlds leading fluid sealing solution providers in extreme pressure seals and the ASTRA Seal® is a unique sealing solution for Cryogenic Applications. Manufactured by the guidance of an Aerospace Engineer the seal helps to combat the harsh environments associated with liquid oxygen, liquid nitrogen and hydrogen. In most cases this extreme pressure seal will outperform an FFKM for compression set.

If you are unsure of what you require our experienced team will guide all aspects of production, including prototyping, testing, and final part manufacture.


To view the ASTRA Seal® sizes and tolerances click here.

Why Astra Seals® as your extreme pressure seal?

Where traditional O Rings become brittle in extreme low temperatures the Astra Seal® is designed to mitigate that risk. The Astra Seal® comprises of 302 stainless flat wound ribbon spring, which is then encapsulated in either FEP or PFA jacket to form an O Ring. Temperature ranges for FEP are -250°C to 204°C (-420°F to + 428°F) and for PFA -250°C to 260°C (-420°F to + 500°F).

The Astra Seals® has been successfully used in several space shuttle/rocket launches and in applications for NASA, Boeing and Lockheed.


Other High Performance Extreme Seals

Some of the worlds leading Compressor Pump, and Valve, Energy, Chemical Processing and Semiconductor companies count on M Barnwell Services for short lead times and guidance on material selection for their sealing application. We utilize a host of sophisticated technologies and processes to consistently provide the high-quality components you demand. In addition to Astra Seals® will also supply:

  • High Temperature Seals (MBMS1108 performs at 310°C)
  • Low Temperature Seals (MBMS0493REV2 performs at -46°C)
  • AD / RGD Resistance Seals (MBMS0268)
  • Sour Gas (H2S) Seals(MBMS0297)
  • Bespoke / Customer Designed / Special Extreme Seals

Astra Seal Encapsulated in PFA

More information about our range can be found on our Extreme Seals page. Click here to view our Astra Seal Fitting Guide.

To find out more about how M Barnwell Services can assist with your extreme pressure seal requirements, contact our specialist team or fill in the Astra Seal RFQ Form.

E & OE.  M Barnwell Services endeavour to make sure that all content is correct. The information has been gathered from manufacturing partners.