Sigma® 533

Sigma® 533  

Sigma® 533 is a high performing, biaxially orientated PTFE based material that contains a barium sulphate (barytes) filler. The material offers standard compressibility and is ideal for sealing applications in the food, drink and pharmaceutical industries. It is FDA compliant and is suitable for use with strong alkalis and chemicals across the whole pH range of 0-14 (except molten alkali metals, fluorine gas and anhydrous HF). Sigma® 533 is also suitable for use with hydrofluoric acid below 49%.

We have the machining capabilities to covert this material into any standard table size flange gasket, bespoke gasket or picture frame gasket. If you require further information on how to measure your gasket, please see our helpful guide on 'How to Measure a Gasket'A full comparison of our Novus™ and Sigma® gasket materials can be viewed by clicking here, should you require further information.

Sigma® 533 is available to buy online by the sheet at PAR Direct by clicking the link above.


An ideal sealing gasket material for use in food, drink, pharmaceutical and other non-contamination applications.

Key Features

  • Temperature: -250°C to +260°C maximum.
  • Max Pressure: 85 bar.
  • Offers standard compressibility.
  • Provides excellent resistance to chemicals, especially strong alkalis.
  • Food approved gasket material.


  • Conforms to FDA regulations.
  • TA-LUFT approved.


Product Code Sheet Size (mm)* Sheet Thickness (mm)
SIGMA533-1.5 1500 x 1500 1.5
SIGMA533-3 1500 x 1500 3

*Other sheet sizes/thicknesses are available upon request, but may be subject to longer lead times.

We may supply the Klinger® alternative material. 

Note: Maximum temperature and pressure should not be used at the same time. All values are dependent on application, please refer to the data sheet below.

Technical Specification:

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