Control of Substances Hazardous to Health

From 6 April 2005, a new focus on good practice will help employers meet their duties under the Control of Substances Hazardous to Health Regulations (COSHH).

As of 6 April, adequate control of exposure will require employers to:

Apply the eight principles of good practice for the control of substances hazardous to health.
Ensure that the Workplace Exposure Limit (WEL) is not exceeded.
Ensure that exposure to substances that can cause occupational asthma; cancer; or damage to genes that can be passed from one generation to another; is reduced as low as is reasonably practicable.

A single type of limit is also being introduced, with Workplace Exposure Limits (WELs) replacing Maximum Exposure Limits (MELs) and Occupational Exposure Standards (OESs). The OESs for around 100 substances will be deleted as the substances are now banned, scarcely used or there is evidence to suggest adverse health effects close to the old limit value.

Two new limits are being introduced for Refractory Ceramic Fibres and Subtilisins.

As the numerical values of the other limits being transferred to the new system are unchanged, suppliers may exhaust stocks of safety data sheets that refer to MELs and OESs before producing new ones that refer to WELs. Similarly, COSHH assessments can be updated as part of duty holders periodic reviews.

The eight principles, which will apply regardless of whether a substance has an Occupational Exposure Limit are as follows:

Eight Principles of Good Practice - COSHH

Design and operate processes and activities to minimise emission, release and spread of substances hazardous to health.
Take into account all relevant routes of exposure - inhalation, skin absorption and ingestion - when developing control measures.
Control exposure by measures that are proportionate to the health risk.
Choose the most effective and reliable control options which minimise the escape and spread of substances hazardous to health.
Where adequate control of exposure cannot be achieved by other means, provide, in combination with other control measures, suitable personal protective equipment.
Check and review regularly all elements of control measures for their continuing effectiveness.
Inform and train all employees on the hazards and risks from the substances with which they work and the use of control measures developed to minimise the risks.
Ensure that the introduction of control measures does not increase the overall risk to health and safety.

Employers who currently comply with COSHH, will still be able to do so by continuing to apply good practice. Good practice advice on controlling chemicals is available at HSE's COSHH Essentials website: http://www.coshh-essentials.org.uk/

For further information contact HSE Infoline – 0845 345 0055

The information on this web page relating to the Eight Principles of Good Practice is produced with the permission of the Health and Safety Executive and remains Crown Copyright.

The source of this information is courtesy of Health and Safety Executive.

Published 10 August 2005.