Gases

Ammonia (NH3) is a lighter than air gas, however in the presence of moisture (such as high relative humidity) can act heavier than air.

Carbon Dioxide (CO2) occurs naturally in the environment, it does not burn or cause combustion.

Carbon Monoxide (CO) is a highly poisonous gas in low concentrations. The fact it has no taste or smell makes it especially dangerous.

Chlorine (CL) is a toxic gas greenish yellow gas with a characteristic odour. It combines directly with nearly all elements.

Ethylene (C2H4) is a colourless gas which is highly flammable with a LEL of 2.7% in air.

Ethylene oxide (C2H4O) is a flammable, colourless gas at temperatures above 10.7°C that smells faintly sweet.

Many gases and vapours when mixed in the correct proportion with an oxidant, normally air, will ignite.

Formaldehyde (CH2O) is a colourless, strong-smelling gas often found in aqueous solutions. Used commonly as a preservative in medical laboratories and mortuaries.

Hydrogen Chloride (HCL) is a colourless, highly toxic gas with a strong odour. HCL is highly corrosive and readily dissolves in water to give Hydrochloric acid.

Hydrogen Cyanide (HCN) is a colourless gas that smells slightly of almonds. It is extremely poisonous.

Hydrogen Fluoride (HF) is a colourless gas, with a pungent odour. And causes eye and throat irritation at just 3ppm.

Hydrogen Sulphide (H2S) is a colourless gas with a characteristic rotten egg odour. It is highly poisonous.

Nitric Oxide (NO), nitrogen oxide, or nitrogen monoxide is a colourless gas. Often used in industrial chemistry.

Nitrogen Dioxide (NO2) is an extremely toxic gas, readily detected by its acrid chlorine-like smell at low concentrations.

Nitrous Oxide (N2O) , also known as ‘laughing gas’ due to its euphoric effect when inhaled. It is commonly used in surgery and dentistry.

Oxygen (O2) is one of the main components of air and occurs normally at 20.9% in the atmosphere at sea level.

Ozone (O3) is a pale blue gas with a distinctively pungent smell. Ozone gas is a powerful oxidant and has many industrial and consumer applications.

Silane (SiH4) is a colourless, flammable gas with a sharp, repulsive smell similar to acetic acid.

Sulphur Dioxide (SO2) is a colourless gas with an irritating pungent odour. It readily dissolves in water.

Volatile organic compounds (VOCs) are organic chemicals that have a high vapour pressure at ordinary room temperature.