SEALPACK NON-ASBESTOS SEALPACK Gaskets made of graphite. Available in sheets of - Pure graphite, Graphite sheets with stainless steel cut according to the size of the pipe flange standard ANSI, JIS, DIN. Temperature Range : -200 šC to 3300 šC Non â Oxidizing -200 šC to 500šC Oxidizing -200 šC to 650 šC Steam Pressure : 140 bar, 220 bar Chemical Resistance : pH 0-14 except oleum, fuming nitric acid, aqua regia.