The more air through a textile escape can, the more water vapor can pass through and a Reinraumtextil will be all the more comfortable. The Hayzlett Group gathered all the information. Water vapour resistance (clothing Physiology) is generally a textile from clothing-physiological point of view even more cheaper to evaluate the lower water vapor resistance be ret (ret m m mbar/W or m m/PA/W) fails, because it is an even better evaporation of sweat from the body of the wearer. A Thermoregulationsmodell of human skin (skin model) is used as a tester. The test conditions are to see DIN EN 31 092 (02/94) or ISO 11 092 (10/93) Of 3 measurements at 3 different sample sections of tissue, the result is determined. Policy studies (source: Hohenstein Research Institute, study No. 02.4.4588 2.12.2002) can values be used following ret as assessment of tissues, which are intended for use as a clean room clothes. Ret _ 3 m PA/W very good 3 m/PA/W < ret _ 4 m/PA/W good 4 m/PA/W < ret _ satisfying 5 m/PA/W ret > 5 m/PA/W unsatisfactory anti-static the dissipation of a clean room tissue also plays a crucial role, as a textile (consisting of synthetic fibers, in special polyester) always tends to load up due to friction. This charge should be fast and also controlled be dismantled, so that particles are not attracted by the textile and be then uncontrolled solved by E.g. movement from the surface and contaminate the product. The charge reduction works through the use of conductive yarns (yarns are in defined intervals such as 5 mm in warp and weft direction in) the tissue introduced) the actual carbon is located in the center of the fiber and has only small contact points to the surface on the sides. This type of yarn is very widely used in clean room be weaving, because it is considered the toughest one, and thus the entire garment is permanently conductive.