... , spray paint (black, yellow), hot galvanization, Electric galvanization or colored electroplate, powder coating and so on.6.Varieties: threaded flange, slip-on flange (SO ... plate flange, welding neck collar, welding-on collar, loose plate flange, companion flange and so on.7.Standards: KS B1502, JIS B2203 ... , South and North America, Middle East, Asia, Africa and so on casting flange