What is a dangerous substance? Dangerous substances are any substances used or present at work that could, if not properly controlled, cause harm to people as a result of a fire, explosion or similar incident, such as an uncontrolled chemical reaction. They can be found in nearly all workplaces and include such things as solvents, paints, varnishes, flammable gases, liquefied petroleum gas (LPG), dusts from machining and sanding operations, and dusts from foodstuffs. Dangerous substances do not include all materials that can catch fire in the workplace. However, some materials that can cause the rapid escalation of a fire if handled in a certain way are also classed as dangerous substances under DSEAR (eg cellular plastic foams). What is an explosive atmosphere? An explosive atmosphere is a mixture of a dangerous substance or substances (gas, mist, dust or vapour) with the air, which has the potential to catch fire or explode. An explosive atmosphere does not always result in an explosion but, if it does catch fire, the flames travel quickly. If this happens in a confined space (eg in plant), the rapid spread of the flames or rise in pressure could also cause an explosion. When does DSEAR apply? The workplace Regulations apply to the majority of work activities, including those carried out in moveable structures, outdoor areas and domestic premises, where work is being carried out by an employer (or self-employed person and a dangerous substance is present (or is liable to be present or generated) in the workplace .
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