Purpose of an SCL
It adjusts the concentration at which classification is triggered.
Source and status
Separate harmonised values, notifications and supplier values.
Link to a hazard class
An SCL is not a universal threshold.
Use in mixtures
Compare concentration within the relevant classification method.
Traceability
Retain the value, source, date and conditions.
Verification example
Before use, confirm that Index number, form and hazard class match the regulatory entry.
Checklist
Exact identity
Associated class
Primary source
Current version
Conditions checked
Common mistakes
×using one SCL for every hazard
×copying without a source
×ignoring substance form
×confusing threshold types
Frequently asked questions
Does every substance have an SCL?
No. Generic criteria may apply where no SCL exists.
Is a supplier SCL harmonised?
Not necessarily; its regulatory status must be identified.
Does a general answer validate a specific product?
No. The actual composition, form, supplier data and intended use must be assessed.
Who should approve the result?
A competent person should review the data, method and internal consistency before supply.
Primary sources
Check the current consolidated version and the exact substance or product scope before use.