New standards have larger than nominal size inside diameter to 12" size - above 12" the ID is same as nominalOld ANSI standards have same ID as the nominal sizeFor water: neoprene, red rubber, " to 36"; full-face and raised face (ring)For fuels & oils: " to 24" full-face and raised face (ring)nitrile (NBR, buna-n), Viton, vegetable fiber and compressed sheet: Gardico 522T, Klinger C-4401, Garlock 3200For steam to 750o F: " to 36" full-face and raised face (ring) compressed sheet, aramid fiber with nitrile binderGardico 522T, Klinger C-4401, Garlock 3200For engine applications to 1200o F: synthetic fiber and nitrile with metal insert:Gardico 596B.For exhaust systems to 1800o F: vermiculite & ceramic fiber with metal insert Gardico 596E, 596G