Back-up Ring, also named Convoluted Flanges for IPS adapter.
Material: ductile iron A536 60-45-12 or CF8M.
DR7 with pressure 275psi.
Surface for ductile iron ring: Red prime paint/Epoxy Coating/E-coating/Hot dippted galvanized.
Size from 1/2″-63″
Kindly contact with us for further detailes of ductile iron back up ring.