RC-1523 Seal, Marine Seal for Marine Pumps, Compressors and Freezers, Material: sic, cer, car, NBR, EPDM, Viton, SS. Product Information Marine Seal is special mechanical seals ... : sic, ceramic etc.Rotary ring: carbon graphite, sic, etc.Secondary seal: NBR, EPDM, VitonOthers: SS304, SS316, etc.2. Primary Competitive Advantages ...