DS EN 464:1995 Protective Clothing - Protection Against Liquid And Gaseous Chemicals, Including Aerosols And Solid Particles - Test Method: Determination Of Leak-Tightness Of Gas-Tight Suits (Internal Pressure Test) Specifies a test method to assess the resistance of a gas-tight suit to the penetration of gases through, for example, essential openings, fastenings, seams, overlaps between items, pores and any impe