... hot runner and cold runner are available) types.3. The common mold steel we use are NAK80, P20, 4140, S50C4. We ... . WSR's rubber workshop Description: Description: Material: comply to RoHS, silicone or rubber (NR, SBR, NBR, EPDM, CSM, CR, HNBR, VITON ... Color: for rubber, usually black, for silicone, can be in any color as you want Machine type: 50 to 400 tons Molding service: we ...