For more than two decades, Donaldson Torit has advanced the proven and proprietary Ultra-Web technology Made with an electrospinning process that produces a very fine, continuous fiber of 0.2-0.3 micron in diameter, Ultra-Web nanofibers form a permanent web-like net with very fine interfiber spaces of the media. Combining superior Ultra-Web technology with a sturdy spunbond polyester substrate, the Ultra-Web SB pleated bag filters deliver longer filter life, higher efficiency and greater cost savings for baghouse collectors.