http://www2.donaldson.com/torit/en-us/pages/products/ultra-webmediatechnology.aspx
Proven and proprietary Ultra-Web® technology delivers longer filter life, cleaner air and greater cost savings than other types of cartridge filter media. This video explains the electrospinning process that is used to produce a continuous, resilient fiber that traps dust on the surface of the media; thus, the filters are easier to clean and provide lower operating pressure drop.
