A 260 °C (500 °F) maximum service temperature, expanded polytetrafluoroethylene felt filter bag for use in back washable liquid filter systems with chemically aggressive operating conditions.

Features & Benefits

  • Patented GORE™ High Durability Membrane technology provides an excellent combination of filtration efficiency, liquid flow, and durability.
  • Chemically inert providing the highest all-around chemical resistance and maximum bag life.
  • Constructed using a woven ePTFE scrim that provides excellent dimensional stability, extended flex life, and resistance to mechanical damage over the life of the filter.


  • Chloralkali Processing: Brine filtration for removal of Ca, Mg, Fe and Hg precipitates in the primary brine treatment area prior to electrolysis.
  • Sodium Chlorate: Removal of iron compounds from chlorate solutions prior to crystallization.
  • Sodium Hypochlorite: Filtration of high-strength bleach solutions for removal of fines that cause bleach decomposition.

Laminate Technical Data

Weight 830 g/m2 (24.5 oz/yd2)
Fiber Content Staple: GORE® Expanded Polytetrafluoroethylene
Scrim: Woven Expanded Polytetrafluoroethylene
Felt Construction Supported Needlefelt
Membrane Material Expanded Polytetrafluoroethylene
Membrane Efficiency > 99 % 1.0 micron (per ASTM F795-88)
Membrane DI Water Permeability > 19 m3/h/m2 @ 69 kPa (0.6 bar)
Continuous Operating Temperature 260 °C (500 °F)
Maximum Surge Temperature 274 °C (525 °F)
Acid Resistance Excellent
Alkali Resistance Excellent
Breaking Strength
• Machine Direction
• Cross-Machine Direction

668 N/5 cm (150 lb/2 in) wide sample
890 N/5 cm (200 lb/2 in) wide sample

Mullen Burst 3860 kPa (750 psi)
Thickness 1.05 mm (0.042 in)
Thermal Stability < 2 % shrinkage at 260 °C (500 °F) after 2 hours (unrestrained)
Durability Excellent

Note: All data expressed as typical values. This technical data is subject to change. Please contact W. L. Gore & Associates, Inc., directly to confirm current information.


Not for use in food, drug, cosmetic or medical device manufacturing, processing, or packaging operations.