Paraffins, normal C5-C20 (CAS 64771-72-8) — Citrus Carrier Note Fragrance Ingredient
Paraffins, normal C5-C20
CAS 64771-72-8
What Is Paraffins, normal C5-C20?
Paraffins (C5-C20) are a mixture of synthetic hydrocarbons commonly used as solvents and carriers in perfumery. They’re found in everything from candles to industrial fragrances. While odorless themselves, they help control the release of other scent molecules. These stable compounds act as invisible workhorses in fragrance formulations, ensuring even evaporation and longevity without contributing their own scent profile.
Safety Profile
GENERALLY SAFEWhat Does Paraffins, normal C5-C20 Smell Like?
Paraffins (C5-C20) are essentially odorless, serving as neutral carriers rather than active fragrance components. Their lack of scent makes them ideal for technical applications where they function as invisible scaffolding – modifying viscosity, controlling evaporation rates, and carrying aromatic compounds without imparting any sensory interference. In formulations, they provide a blank canvas that allows other ingredients to shine.
Chemistry, Properties & Perfumer Guide
The Chemistry
Paraffins (C5-C20) are straight-chain alkanes synthesized through petroleum refining or Fischer-Tropsch processes. This mixture contains hydrocarbons with 5 to 20 carbon atoms, giving it a range of physical properties. The shorter chains (C5-C10) are more volatile while longer chains (C15-C20) provide better solvency and film-forming characteristics. Being fully saturated hydrocarbons, they are chemically inert and resistant to oxidation.
Physical & Chemical Properties
| Appearance | Colorless liquid |
|---|---|
| Boiling Range | 36-370 °C |
| Flash Point | Varies by chain length |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Functional Fragrances | 10-30% | Up to 50% | As solvent/diluent |
| Candles | 20-60% | Up to 80% | Fuel and fragrance carrier |
| Industrial Applications | 5-15% | Up to 25% | Process aid |
Classic Accords
Tip: Use to adjust viscosity and modify evaporation rates without affecting fragrance character.
Alternatives & Comparisons
Branched-chain hydrocarbons with similar solvent properties but lower freezing points for cold climate formulations.
Longer-chain hydrocarbon mixture offering greater viscosity and slower evaporation rates.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No IFRA restrictions apply.
RIFM Assessment
Considered safe for current fragrance uses based on hydrocarbon class data.
Sustainability
Paraffins are petroleum-derived, raising sustainability concerns. Synthetic production allows for precise control of chain lengths, reducing waste compared to natural alternatives. The industry is exploring bio-based paraffins from renewable sources as alternatives, though cost and availability remain challenges.
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References
- Kirk-Othmer Encyclopedia of Chemical Technology. Hydrocarbons. Wiley Reference
- IFRA Standards Library. Hydrocarbon Solvents. IFRA
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorIngredient Data Sheet
CAS 64771-72-8Physical data: PubChem (NIH/NLM), U.S. EPA CompTox Dashboard, EPA OPERA models, RDKit. Odor & flavor: Arctander (Perfume & Flavor Chemicals), Fenaroli's Handbook of Flavor Ingredients, Leffingwell. Thresholds: van Gemert (Compilations of Odour Threshold Values). Regulatory: IFRA Standards 51st, FEMA GRAS. Trade names: Surburg (Common Fragrance & Flavor Materials). All data compiled and cross-referenced for perfumertools.com.
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