Chemicals can be explosive, flammable, inflammable, radioactive, toxic, irritating, corrosive and environmentally harmful. They can be gases under pressure, or have effects that appear later. Furthermore, the same chemical can include different hazards and the same chemical can be flammable, corrosive and harmful to health.

Storage places and storage containers for hazardous chemicals must be clearly marked with hazard pictograms and/or warning signs. Information can also be vund on the webpage of The Environmental Agency www.ust.is