China
Sigma
Versatility personified.
Developed for processes ranging from cryogenic temperatures to 500ºF (260ºC), and suitable for sealing virtually every chemical medium across the entire pH range (0-14), Sigma pairs the outstanding chemical resistance of PTFE with enhanced dimensional stability. Sigma range materials contain non-stick properties that aid in an easy removal process after their usage to dramatically reduce the downtime on shutdown.
Sigma 500
Product Resources
MATERIAL: Biaxially orientated PTFE containing hollow glass microspheres
COLOR: Blue
COLOR: 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
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MATERIAL: Biaxially-orientated PTFE containing silica
COLOR: Fawn
COLOR: Fawn
- 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
Product Resources
MATERIAL: Biaxially orientated PTFE containing barium sulfate
COLOR: Off white (pigment free)
COLOR: 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
Product Resources
MATERIAL: Biaxially orientated PTFE
COLOR: Off white (pigment free)
COLOR: 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
Product Resources
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: 500°F (260°C)
- Max Pressure: 1235 psig (8.5 MPa)
- ASME m: 1.4
- ASME y: 1595 psi (11 MPa)
- pH Range: 0–14
