t6 stationary parts compliy with DIN24960 and ISO3069,combined with our types:DY51,DY512,DY513 and DY520 and the seal ring matreials are made of ceramic 99.5%,ceramic 99%,ceramic 95%,tungsten carbide/TC,sintered silicon carbide/ssic,reaction bonded silicon carbide/sic and so on.The ruuber bellows and o-rings are in NBR,FKM,EPDM,HNBR and so on.