... 3.Material:CS-SS 4.Certificates:API,CE,ISO Stainless Steel Flange S235JR Carbon Steel Flange(UNI2276, UNI6083, UNI6089, UNI2280-2285, UNI2253, UNI6092 ... .8, P250GH, A105Stainless steel: 304 316Marking:RequirePacking:Wooden PalletsPainting:Rust-Preventative oil painting or black/yellow/varnish painting or GalvanizingQuality control:Internal/ ISO9001 ...