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Chemical resistant.
Uniformly strong.
Inherently clean.

Sigma® pairs the outstanding chemical resistance of PTFE with enhanced dimensional stability.

Developed for processes ranging from cryogenic temperatures to 260ºC, and suitable for sealing virtually every chemical medium across the entire pH range (0-14). Sigma® range 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.

To further enhance our product portfolio, we can also offer expanded PTFE products (ePTFE) sheet sealing material and Gasket Tape.


Sigma® PTFE materials are a great alternative to Gylon and Top-Chem.


  • Sigma® 500

    Biaxially orientated PTFE containing hollow glass microspheres
    COLOUR: Blue

    • 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
  • Sigma® 511

    Biaxially-orientated PTFE containing silica
    COLOUR: Pink

    • 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
  • Sigma® 533

    Biaxially orientated PTFE containing barium sulfate
    COLOUR: Off white (pigment free)

    • 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
  • Sigma® 588

    Biaxially orientated PTFE
    COLOUR: Off white (pigment free)

    • 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
  • 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
  • Sigma® 800 Expanded Sheet (ePTFE)

    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
  • 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
  • SABIC enhances workforce skills with The Academy Of Joint Integrity
    SABIC enhances workforce skills with The Academy Of Joint Integrity
  • Thermiculite® High Temperature Material – Invincible against Heat.
  • Change™ Gasket – Our best gasket yet - proven to perform 60% longer!
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