TEMISH is a general term for the polytetrafluoroethylene (PTFE) porous membranes manufactured by Nitto Denko. These porous membranes have several hundred million micropores per 1cm² and feature waterproofness and dustproofness, as well as air permeability. In addition, they have other excellent features such as water repellency, heat resistance, chemical resistance, weatherability, and electrical properties, and can be laminated or compounded with various other materials. With these superior properties, TEMISH is used in such varied applications as air filters, insect filters, water/dustproofing and air and acoustic ventilation material for automobiles, communication devices, outdoor equipment, and home appliances.

With hundreds of millions of micropores per square centimeter, TEMISH allows passage of gases such as water vapor, but repels liquids with high contact angle such as water, sulfuric acid, and nitric acid. This selective permeability realizes high water/dustproofness and air permeability simultaneously.

PTFE resin, the ingredient of TEMISH, exhibits superior chemical resistance whereby it is impervious to almost all chemicals. In addition, they also have other excellent features such as water repellency, heat resistance, weatherability, and electrical properties.

By laminating or compounding to substrates such as woven, non-woven or glass cloth, and paper, rubber, and plastic moldings, TEMISH is utilized in various fields as a high performance material.