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Donaldson Company is a worldwide manufacturer of expanded ePTFE membranes called Tetratex®, and sub-micron polymeric nanofiber materials that we market under the names Ultra-Web® and Spider-Web®. Tetratex® membranes are fabricated in a variety of proprietary pore structures, widths, thickness and lengths, providing flexibility to meet your needs. The diversity of our products enables us to solve tough problems in a variety of markets including, Industrial Filtration, Pharmaceutical, Microfiltration, Fuel Cell, Venting and Medical.

Donaldson nanofibers are created from a proprietary electrospinning process that results in fiber diameters less than 0.5 microns (less than 500 nanometers). The typical fiber diameter is 200 to 500 times smaller than a human hair. While we’ve used nanofibers to provide filtration solutions for a quarter of a century, we are now seeking other applications for this nano technology.