Leak Detection viscous is perfect for the fast, comfortable and reliable location of cracks or porous parts in pressurized pipes. Leak Detection viscous does not form any harmful compounds with these gases: carbon dioxide (CO2), propane, butane, acethylene, oxygen, coal and natural gas, nitrogen, dinitrogen monoxide (N2O) and CFC. It is non-flammable. It is suitable wherever compressed air or gaseous substances are used, for example on pipes, hoses, fittings, screw connections, valves and adapters.