Ring gaskets are a flat sealing element, consisting of an inner and outer diameter sized to fit a flange’s bore and bolt circle. Ring gaskets sit inside the flange’s bolt circle. ASME B16.21 and ASME B16.47 govern the dimensions of ring gaskets for standard and large diameter pipe flanges. Teadit NA 1122 was developed to exhibit superior thermal stability during extreme thermal cycling applications. It is specifically recommended for saturated and superheated steam services but has also proven itself to be very effective in sealing liquid petroleum derivates, ethanol, chemical products and other ﬂuids. Field tests have validated the results found in our laboratories and have confirmed the higher performance capabilities of NA 1122.