Define the mixture
Fix composition, ranges, form and properties.
Select relevant evidence
Mixture tests and component data have different scope.
Use the correct method
Limits, additivity and bridging depend on the hazard class.
Assess each hazard
Physical, health and environmental hazards require separate decisions.
Document the rationale
Record sources, assumptions, exclusions and approval.
Method example
For an acidic mixture, review SCLs, final properties and available tests before deciding corrosion or irritation.
Checklist
Common mistakes
Frequently asked questions
Is a CAS number sufficient?
No. Concentration, form, quality and the whole mixture matter.
Can bridging principles always be used?
No. Applicability depends on the evidence and hazard class.
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.