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COMAH: The application of CLP and Aggregation in the COMAH 2015 Regulations

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HSL is to run a 1 day course on COMAH: The application of CLP and Aggregation in the COMAH 2015 Regulations.

14 June 2017

Please note this course is replacing the COMAH: The new Seveso III Directive and GHS course


The Control of Major Accident Hazards Regulations (COMAH) 2015 come into force on 1 June 2015. One of the major changes introduced by the regulations is the use of the Classification, Labelling and Packaging (CLP) Regulations to classify the hazardous properties of chemicals and to use these classifications to decide if establishments are in scope. The new classification scheme brings with it the potential for sites to change their COMAH status (upper tier, lower tier or non-COMAH) depending on the substances and quantities held.

The course gives an overview of the requirements of the new Regulations. It also covers the potential changes in scope brought about by the CLP classifications, how to determine the CLP classification of chemicals and how to apply the COMAH aggregation rules to determine the COMAH status of a site.

The course will cover:

  • Introduction to the COMAH 2015 Regulations highlighting the major changes to the scope introduced by the application of CLP
  • Alignment of COMAH 2015 with CLP
  • How to determine CLP category for acute toxicity - pure substances and mixtures
  • How to determine GHS category for environmental hazards (M factor method)
  • The application of the aggregation rules
  • A classification and aggregation exercise

Who should attend?

Safety managers and those responsible for compliance with the COMAH Regulations should attend. This would include existing COMAH upper tier and lower tier sites, and also sites which were outside of scope of the COMAH 1999 Regulations but may have potential to come into scope of the new regulations.


The course will be run at the HSL laboratory in the spa town of Buxton. Buxton is in the heart of the Peak District and has good links to mainline train stations and Manchester International Airport.

Details of hotels in the Buxton area can be found at


The cost of the course is £600 per person (includes course notes, lunch and refreshments).

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Please note the invoice option is not available within 4 weeks of the course date, or for overseas customers.  If you are selecting the invoice option for payment, it will be mandatory to input a purchase order/reference number as we are unable to process booking forms without this.

For further dates and additional information email: or contact the Training & Conferences Unit
at HSL directly on +44 (0)1298 218806.

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Contact Details

Training & Conferences Unit
Harpur Hill
Buxton, Derbyshire
SK17 9JN

T: +44 (0)1298 218806