... -neck, Slip-on, Plate, Blind. 4) Certification:ISO9001 Carbon Steel Flange: Type:Welding-neck, Slip-on, Plate, Blind.Marking: On Required ... Flanges 6.BS4505,GOST 12820-80,12821-80 flangesTABLE D,TABLE E,TABLE H flangesAt present our products are mainly export to ... the customers.And we have obtained the Certificate of TUV ISO 9001:2008 Quality System