Sigma® 600 - Most compressibility for ultra-low bolt loads for plastic and glass lined equipment. Pigment and filler free - suitable for contamination sensitive applications. Universal - minimizes inventory and eliminates misapplication.

Sigma® 588 - Highly compressible PTFE sheet without filler. Suitable for damaged contact surfaces. Layered structure enhances dimensional stability and ease of use. Layers bonded by direct sintering - no adhesive or potential leak path.

Sigma® 533 - Standard compression sheet material reinforced with barytes (barium sulphate) filler. Sigma® 533 is the preferred choice for sealing concentrated alkalis and is also compatible with Aqueous Hydrofluoric Acid below 49%. Restricted resistance to concentrated mineral acids. Sigma® 533 is listed in the Chlorine Institute Pamphlet 95.

Sigma® 511 - Standard compression sheet material reinforced with a silica filler. Intended for use with concentrated acids (except hydrofluoric acid) and with most general aggressive chemicals. Also suitable for medium concentrations of alkalis.

Sigma® 500 - Enhanced compressibility for lower bolt loads achieved by the incorporation of hollow glass microspheres as the inorganic filler. Formulated for use on glass lined and ceramic flanges.Compatible with acids and alkalis at all but the highest concentrations.