PTFE Products

Developed for processes ranging from cryogenic temperatures to 260ºC, and suitable for sealing virtually every chemical medium across the entire pH range (0-14). Flexitallic Sigma® PTFE materials contain non-stick properties that aid in an easy removal process after their usage to dramatically reduce the downtime on shutdown.

All components in the Sigma® range are FDA compliant. The material’s clean nature make it ideal for use where product contamination is of concern, such as food, pharmaceuticals and electronics.

The chemical resistance and dimensional stability of the material ensures total sealing reliability and minimises fugitive emissions.
We also offer expanded PTFE products (ePTFE) sheet sealing material and Gasket Tape.

Flexitallic Sigma 500

Flexitallic Sigma® 500

Biaxially orientated PTFE containing hollow glass microspheres.

  • Enhanced compressibility for low bolt loads
  • Improved flexibility over conventional calendered and graphite sheets
  • Moderate concentrations of acids & caustics, chlorine and hydrogen peroxide
  • Can be used for all concentrations of sulfuric acid
  • WRAS approved for hot and cold potable water services
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Flexitallic Sigma® 511

Biaxially-orientated PTFE containing silica.

  • Standard compressibility
  • Strong acids (except hydrofluoric) to general chemicals
  • Can be used for all concentrations of sulfuric acid
  • Not suitable for molten alkali metals, fluorine gas or hydrogen fluoride
  • WRAS approved for hot and cold potable water services
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Flexitallic Sigma® 533

Biaxially orientated PTFE containing barium sulphate

  • Standard compressibility
  • Ideal for sealing food, pharmaceutical and other non-contamination applications
  • Strong alkaline solutions to other general chemicals
  • Aqueous hydrofluoric acid below 49%
  • Not suitable for sealing molten alkali metals or fluorine gas
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Flexitallic Sigma® 588

Biaxially orientated PTFE

  • Highly conformable surface layers designed for glass-lined, FRP, ceramic, plastic and low bolt load applications
  • Modified PTFE inner core design to maximize sealability and prevent blow-out
  • FDA compliant
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Flexitallic Sigma® 600

Developed specifically for petrochemical and chemical use. FDA compliant for both low and high bolt loads. Is non contaminating with lower creep an cold flow. A single gasket replacement for metallic and non-metallic flange applications.

  • Max Temperature: 260°C (500°F)
  • Max Pressure: 1235 psig (8.5 MPa)
  • ASME m: 1.4v
  • ASME y: 1595 psi (11 MPa)
  • pH Range: 0–14
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Flexitallic Sigma® 800 Expanded Sheet (EFPTFE)

Sigma® 800 Sheet is a high quality expanded PTFE sheet sealing material (ePTFE) with enhanced low stress sealing characteristics and improved blow-out resistance and is suitable for sealing most chemicals across the pH range.

  • FDA compliant
  • 100% pure expanded PTFE
  • Enhanced low stress sealing
  • Improved blow out resistance
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Flexitallic Sigma® 850 Gasket Tape

Sigma® 850 Gasket Tape is a high performance expanded PTFE (ePTFE) Gasket material with improved creep resistance.

The material is soft and conformable making it suitable for use in applications involving damaged sealing surfaces or where limited compressive load is available.

  • 100% expanded PTFE (ePTFE)
  • Can be used on damaged sealing surfaces
  • Easy to install
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