What are the physicochemical properties of this geranium oil?
Geranium oil is a light, mobile, volatile oil with well-defined physical constants. These values are measured on every batch and are the fastest way to verify authenticity against FCC 12, ISO 4731 and QB/T 3764.
Physicochemical Properties
| Property | Value |
|---|---|
| Appearance | Clear to pale yellow to greenish mobile liquid |
| Relative density (20°C) | 0.886-0.898 (product window = FCC 12; QB/T 3764 & ISO 4731 China: 0.882-0.899) |
| Refractive index (20°C) | 1.464-1.472 (product window = FCC 12; ISO 4731 China: 1.460-1.469) |
| Optical rotation (20°C) | -13° to -7° (FCC 12); -14° to -7° (QB/T 3764 & ISO 4731 China) |
| Acid value | ≤ 8 mg KOH/g (QB/T 3764); FCC 12 range 1.5-9.5 |
| Ester value after acetylation | 215-240 mg KOH/g (QB/T 3764); FCC 12: 203-234 |
| Solubility | 1 mL + 3 mL 70% ethanol → clear (slight opalescence allowed) |
| Flash point (closed cup) | ≥ 64°C (typical 64-93°C) |
- The density/RI window matches FCC 12 exactly while sitting inside the ISO 4731 China-type range — a strong dual-compliance selling point
- Acid value is a freshness/oxidation indicator: fresh lots sit low, aged or poorly stored oil climbs
- Ester value after acetylation reflects total alcohol + ester content — the flavour-quality gate for Chinese standard oil
- All constants are printed on the Certificate of Analysis for every batch
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This article was published on 2026-09-07, and last updated on 2026-09-07. The article will be continuously updated.
