... " 2.Brass:57-62%,Ceramic disc,Rubber O-ring 3.Life span:500000times brass ceramic disc tap cartridgefast open, India , 60g, ceramic disc, brass fitting, brass ... .1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 Average flow rate 16 ... Sealing face of ceramic discHardness ≥1050HV5 Roughness ≤Ra0.2um Flatness (light band)We mainly produce metal products,brass cartridges, faucet fittings,brass ...