... uses seal or rubber components, for example: In electric heating pot, electric iron, microwave ovens thermostable rubberB..Electronic profession ... in handset pressed key, in DVD antirattler, electric cable wire connection seal and so onC..Various of seal ... hardness for your option, including Buna-N (NBR), HNBR, VITON, Silicone, FluoroSilicone, EPDM, Teflon, Natural Rubber, BUTYL, SBR, Neoprene, ...