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What are hazardous chemicals​?

For a chemical to be hazardous it needs to have a known negative effect on the health of people or the environment.

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What is a hazardous chemical?


A hazardous chemical is a substance or mixture that may pose harm to human health, facilities/property, and the environment.ĚýIt will have one or more of the following characteristics:

  • Irritant
  • Corrosive
  • Harmful to health
  • Toxic or very toxic
  • Flammable / explosive
  • Reactive with in standard lab conditions (reacts with water, oxygen, changes in temperature etc)
  • Oxidiser (reactive with other chemicals)
  • Hazardous to the environment
  • Compressed gas

Chemical substances exist as solids, liquids, vapours, gasesĚýor fumes, and may change betweenĚýthese phases of matter with changes in temperature or pressure​.

The rules for ensuring that hazardous chemicals are used safely are covered in the Control of Substances Hazardous to Health (COSHH) Regulations 2002.

​Control of Substances Hazardous to Health Regulations 2002 (COSHH)


COSHH is the law thatĚýrequires all employers including MyAV·¶ to have effective control over chemicals that are hazardous toĚýhealth.​

Effective control is defined as:​

  1. The principles of good practice for control are being applied and implemented.​

  2. Any workplace exposure is not exceeded.​

  3. Exposure is reduced to as low as reasonably practicable (ALARP).​

​Since 2005 COSHH has given a checklist of controls that should be in place when working withĚýhazardous chemicals. This is not a hierarchal list, all controls should be considered and put in place ifĚýpossible – it isĚýreferred to as theĚýPrinciplesĚýof Good Practice in Control​.

​The way of recording that the Principles of Good Practice in Control have been implemented is aĚýCOSHH assessment.​

Principles of Good Practice for Control​


​There are 8 principles of control within COSHH. This is not a hierarchy where the more important oneĚýis listed first but rather a framework with all eight principles needing to be adhered to:​

​When working with any hazardous chemicals, the risk assessment should indicate how the eightĚýprincipals have been met under the control measures to ensure that when the activity is carried out,Ěýthe risks are adequately controlled.​

1. Design and Operate

Design and operate processes and activities to minimise emission, release and spread ofĚýchemicals hazardous to health.​

2. Relevant routes of exposureĚý​

Take into accountĚýall relevant routes of exposure - inhalation, skin absorption and ingestion - whenĚýdeveloping control measures.​

3. Control exposureĚý​

Control exposure by measures that are proportionate to the health risk.​

4. Effective and reliable controlĚý​

Choose the most effective and reliable control options which minimise the escape and spread ofĚýchemicals hazardous to health.​

5. PPE​

Where adequate control of exposure cannot be achieved by other means, provide, inĚýcombinationĚýwith other control measures, suitable personal protective equipment.​

6. Check​ and Review

Check and review regularly all elements of control measures for their continuingĚýeffectiveness.​

7. Information and TrainingĚý

Inform and train all employees on the hazards and risks from the chemicals with which theyĚýworkĚýand the use of control measures developed to minimise the risks.​

8. Holistic Approach

Ensure that the introduction of control measures does not increase the overall risk to health andĚýsafety.​

Last updated: Wednesday, March 31, 2021

HazardousĚýsubstances mustĚýbe risk assessed before use


Some chemicals are non-hazardous substances andĚýcan be used without a risk assessment.Ěý

COSHH Assessment →