Most of the organic solvents are combustible, often highly volatile and extremely flammable and they should always be handled with care.
Some solvents produce vapours which are heavier than air.
These may move on the floor or ground to a distant ignition source, such as a spark from welding or caused by static electricity. The vapours may also explode from smoking. Vapours of solvents can also accumulate in confined places and stay there for a long time, presenting risks for health and property. Solvents enter the body by inhalation, by swallowing and through the skin. Solvents, their vapours and mists have various effects on human health.