Substance (REACH definition)
Last updated:
21 November 2025
•
3 min read
DEFINITION
‘Substance’ means a chemical element and its compounds in the natural state or obtained by any manufacturing process, including any additive necessary to preserve its stability and any impurity deriving from the process used. Unambiguous substance identification is the foundation for registration and evaluation under REACH.
DeclarationSubstance (REACH definition)
Precise substance identification (including names, numbers, composition, spectra) enables joint registrations under the "one substance, one registration" principle and ensures the suitability of data within dossiers. Distinctions: a mixture is a combination of substances, while an article is primarily determined by its shape, surface or design.
For compliance, a robust substance identity profile (SIP) specifying boundary compositions, impurities and relevant spectra is essential. It forms the basis for classification under CLP, safety data sheets, supply chain communication and potential risk management measures.
Key Points
- Includes necessary additives and impurities.
- Distinction from mixtures under CLP.
- Requires unique identity in dossiers.
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