GASKET DONIT GRAFILIT SP 3mm 5mm 2mm Graphite Gasket GRAFILIT® SP is an expanded graphite-based material with stainless steel inserts, increasing surface load and explosion safety. GRAFILIT® SP has excellent chemical, thermal and mechanical resistance. GRAFILIT® SP is a gasket material used in various industries, such as gas and steam supply, chemical and petrochemical industries