Freudenberg has two of its ISC materials (70 EPDM 281 and 70 NBR 150) and the coating SCB 009.01 in the form of a composite O-ring plus coating tested and approved for hot water applications (up to 85 °C) in accordance with KTW by the TZW testing institute in Karlsruhe, Germany. KTW is a German legislative provision governing the use of plastics and drinking water. Both these materials and the coating already had the appropriate respective KTW approvals as independent components. The decisive advantage for users is that they can use this composite system of O-ring and coating immediately: no need to worry about compatibility, no lengthy and costly testing formalities. The KTW approval completely excludes the possibility of any unwanted interaction between the O-ring/coating and the drinking water. Naturally, these advantages also apply to hot water applications.
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