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Process Filtration Index


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Felt Bags

Felt Bags


At Pure Process, we start with the finest material possible. FSI produces the felt material used in our felt filter bags in-house, guaranteeing the highest quality. Our extended life filter bags provide superior filtration of all sized particles over traditional filter bags and have up to twice the dirt holding capacity of a standard filter bag.

Our no-bypass welded seams eliminate the possibility of fluid bypass through needle holes. We provide a variety of glazed and singed finishes to inhibit fiber migration. Through FSI we can also offer polyester inserted felts. These inserted felts include a reinforcing scrim needle inside the felt material to provide added strength and durability.


  • Broad range of proprietary media provides excellent filtration performance and greater consistency

  • Standard and custom sizes for versatility

  • Offered with plastic and metal rings for wide temperature compatibility

  • Welded or sewn construction

  • Polypropylene felt is FDA compliant. FDA compliant Polyester felt is available by request.

  • Easy change-out reduces down time

  • Compacts for easy disposal

  • Silicone free to prevent craters to provide better surface results

  • Contaminants are trapped inside bag for clearer results

  • Glazed finish eliminates fiber migration to reduce waste

  • Multi-layered bags available for greater versatility

Available Materials:

  • Polypropylene

  • Polyester

  • Nylon

  • High Temperature

  • Teflon

Maximum Operating Temperature:

  • Polypropylene: 200-220°F (93-104°C)

  • Polyester: 275-325°F (135-162°C)

  • Nylon: 275-300°F (135-149o C)

  • High Temperature: 400-450°F (204-232°C)