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Description: Testing method for determining hydrogen transmission rate through flat plastic materials like films, sheetings, laminates, co-extruded or coated materials under a differential pressure. Result Unit: GTR (gas transmission rate) mol/ m2*s*Pa Usally: cm3 (STP)/ m2 * 24 h STP according DIN 1343: the volume… Read More »Hydrogen permeability (manometric) according to ISO 15105