Methyl bromide is a colourless gas at room temperature and standard pressure with a boiling point of about 4 °C. It is heavier than air and easily liquefied below its critical points. It is odourless, except at high concentrations, when it has a chloroform-like smell. It is non-flammable in air, except in the Concentration range of 10-16%, but burns in oxygen. Methyl bromide is slightly soluble in water but freely soluble in other common solvents. It can penetrate through many substances, such as concrete, leather, rubber, and certain plastics.