rubber screw plug 1. NR, CR, NBR, SBR, VITON, EPDM, HNBR, SILICONE, ... screw plug MaterialNR,CR,NBR,SBR, SILICONE,VITON,EPDM, HNBR, BUNA, etc.Hardness30degree-90degreeMode of productionCompression and injectionProduction CapabiltyRubber compression/injection machines ...