Castor oil, fixed (CAS 8001-79-4) — Woody Base Note Fragrance Ingredient
Castor oil, fixed
CAS 8001-79-4
What Is Castor oil, fixed?
Castor oil is a thick, pale yellow vegetable oil derived from the seeds of the castor plant (Ricinus communis). It’s commonly found in cosmetics, pharmaceuticals, and industrial applications. This oil matters because it’s a versatile, natural ingredient with unique moisturizing properties and a long history of safe use.
Safety Profile
GENERALLY SAFEWhat Does Castor oil, fixed Smell Like?
Castor oil has a mild, slightly nutty odor with a faintly sweet undertone. It lacks the sharpness of many vegetable oils, instead offering a smooth, almost buttery aroma. The scent is persistent but not overpowering, making it a subtle base note in formulations.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Castor oil is used as a fixative to enhance longevity and add a subtle richness to the oriental spice accord.
Chemistry, Properties & Perfumer Guide
The Chemistry
Castor oil is primarily composed of triglycerides, with ricinoleic acid (a monounsaturated fatty acid) making up about 90% of its fatty acid content. This unique composition gives it distinctive physical and chemical properties, including high viscosity and solubility in alcohol.
Physical & Chemical Properties
| Boiling Point | 313 °C |
|---|---|
| Density | 0.961 g/cm³ |
| Viscosity | 650-800 mPa·s |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-5% | Up to 10% | Used as a fixative and carrier |
| Cosmetics | 5-20% | Up to 100% | Moisturizing agent |
Classic Accords
Tip: Use castor oil to add body and longevity to fragrance compositions.
Alternatives & Comparisons
A more liquid alternative with similar moisturizing properties but less odor impact.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No IFRA restrictions.
EU Allergen Declaration
Not listed as an EU allergen.
RIFM Assessment
RIFM considers castor oil safe for use in fragrances at current levels.
Sustainability
Castor oil is a renewable resource, with the castor plant being drought-resistant and suitable for marginal lands. Sustainable sourcing practices are important to ensure environmental and social responsibility in production.
Explore Castor oil, fixed
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References
- Scognamiglio et al. (2012). Castor Oil. Chemistry & Biodiversity. DOI: 10.1002/cbdv.201200035
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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