What are the physicochemical properties of this eucalyptus leaf oil?
Eucalyptus leaf oil is a light, mobile, highly volatile oil. Its physical constants are the quickest way to check authenticity and batch-to-batch consistency against the international specifications.
Physicochemical Properties
| Property | Value |
|---|---|
| Appearance | Clear, colorless to pale yellow mobile liquid |
| Relative density (20°C) | 0.905-0.925 (product window); 0.909-0.919 for single-source food grade per GB 1886.33-2015 |
| Refractive index (20°C) | 1.458-1.470 (product window); 1.4580-1.4650 for single-source food grade per GB 1886.33-2015 |
| Optical rotation | 0° to +6° (E. globulus single source); -10° to +10° (mixed source) |
| Boiling point (1,8-cineole) | ≈ 176-177°C |
| Flash point | ≈ 50°C (closed cup) — flammable liquid |
| Solubility | 1 vol + 5 vol 70% ethanol gives a clear solution; insoluble in water, soluble in fixed oils |
- ChP 2025 (pharmaceutical grade): colorless or pale yellow clear liquid, density 0.895-0.920, RI 1.458-1.468, cineole content ≥ 70%
- ISO 770:2002: density 0.906-0.925, RI 1.4580-1.4700 for E. globulus oil
- These constants are measured on every batch and printed on the Certificate of Analysis
- Any significant drift outside the window (e.g., density > 0.930) suggests contamination or adulteration and would be rejected
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