... TUV,German TUV standard Materials of gaskets: NBRHT, EPDMHT, Neoprene, Teflon, Viton I, Viton F Air to Air Heat ExchangerKey Description: 1 ... standard• CCC• CE• Materials of gaskets: NBRHT, EPDMHT, Neoprene, Teflon, Viton I, Viton F• Material of plates: austenitic stainless steel, nickel ... detail info, please feel free to visit our website or inquire us at any of your convenience. Website:www. ...