Liners

Polypropylene (PP) is the least expensive of all our liner systems. It has proven chemical resistance in a wide variety of applications and because it's a copolymer can be used from -30 °C to 100 °C. Mechanical properties are good and tensile strength is generally in the 4000 to 4500 PSI range.

Polyvinylidene Fluoride (PVDF) has excellent mechanical properties and is resistant to most chemicals. It's temperature range is -30 °C to 135 °C. Tensile strength is 4500 to 500 PSI.

EthyleneChlorotrifluoroEthylene (ECTFE) is a fluoropolymer with exceptional properties. It has by far the best combination of chemical resistance and toughness of any lining we offer. It's superior where temperature cycling, mechanical stress, abrasion, or permeation are a problem. Temperature range -30 °C to 150 °C. Tensile strength is typically in the 6000 to 7000 PSI range.

Polyfluoroalkoxy (PFA) has the best corrosion resistance but is tougher mechanically and does not creep or cold flow like PTFE. Temperature from -30 °C to 260 °C. Tensile strength is 4000 to 4500 PSI.

Polytetrafluoroethylene (PTFE) is virtually inert to all chemicals except elemental fluorine and molten alkali metals. PTFE is softer and has less strength for a given thickness than our other liners so it requires special design considerations. PTFE because of its microporosity, has a higher gas permeation rate which can be improved by increasing the liner thickness, which also helps its overall strength.

PTFE has an extraordinarily high molecular weight (1 x 108 g/mol) and also demonstrates an exceptionally high melt viscosity above its crystalline melting point 342° C. Due to these unique characteristics, PTFE is non-melt processable and conventional thermoplastic processing methods can not be employed. That's why we don't use PTFE as a liner.