... Steel Using veneer case or plywood case of outside, linoleum and plastic cloth of inside dampproof, or other methods according ... Types Of Products: Wnrf (Wnff), Sorf (Soff), Blrf (Blff), Swrf (Swff), Plrf (Plff), Ljrf (Ljff), Spectacle Flg8 (Spacer & Blanks), Square Flange, ... galvanization or colored electroplate, powder coating and so on.Types Of Jointing Faces: raised face; ring joint face; tongue ...