... microwave ovens thermostable rubberB..Electronic profession seal or rubber components, like in handset pressed key, in DVD ... : ISO 3601, AS 568A, DIN3771, JIS B2401.2. Our products are of NSF, WRAS, DVGW, ... including Buna-N (NBR), HNBR, VITON, Silicone, FluoroSilicone, EPDM, Teflon, Natural Rubber, BUTYL, SBR, Neoprene, HYPALON, etc. ... (WRC) drinking water standard certification. Silicone Rubber O-Ring