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Mixture classification using the WCO General Rules for Interpretation (GRI).
Mixtures and preparations of chemical substances must be classified according to the General Rules for the Interpretation of the Harmonized System (GRIs):
| GRI | Principle |
|---|---|
| 3a | Most specific description (when all components share the same chapter, use the most specific heading) |
| 3b | Essential character (classify by the component that gives the mixture its essential character, typically the dominant component by weight ≥ 50 % w/w) |
| 3c | Last heading numerically (when 3b cannot determine essential character, use the heading that occurs last among those equally worthy of consideration) |
§Chapter priority (special cases handled before GRI 3)
Before applying GRI 3, the intended use is checked. Some uses are so determinative that they override structural analysis:
| Intended use | Chapter |
|---|---|
| Pharmaceutical | Ch. 30 |
| Agricultural (pesticide formulation) | Ch. 38.08 |
| Cosmetic / beauty | Ch. 33 |
| Food additive / food preparation | Ch. 21 |