... solvent and other weak corrosive medium. Combination of materials Seal face: Graphite, Silicon carbide, Tungsten carbide ,Aluminum oxide ... Standard mechanical seals (John Crane, Burgmann, ROTEN)- OEM dry gas seal mechanical seals (Gundfos, APV, FRISTAM, Alfa-Laval, SIHI, etc ... mechanical seals based on drawings or samples provided by customers- Seal Rings in different materials (SSiC, RBSiC, TC, Ceramic ...