Naphtha, petroleum, hydrotreated heavy (CAS 64742-48-9) — Woody N/A Note Fragrance Ingredient
Naphtha, petroleum, hydrotreated heavy
CAS 64742-48-9
What Is Naphtha, petroleum, hydrotreated heavy?
Hydrotreated heavy naphtha is a petroleum-derived solvent used in industrial applications and some specialty cleaning products. Consumers might encounter it in heavy-duty degreasers or as a carrier fluid in certain pesticide formulations. While not commonly used in consumer goods due to its strong odor and potential health effects, it plays a role in manufacturing processes where its solvency properties are valuable.
Safety Profile
PROFESSIONAL USEWhat Does Naphtha, petroleum, hydrotreated heavy Smell Like?
Hydrotreated heavy naphtha has a strong, characteristic petroleum odor – sharp and somewhat sweet with hydrocarbon undertones. The scent profile is linear without significant evolution, maintaining its industrial solvent character throughout. The aroma is reminiscent of gasoline or kerosene, with a heavy, clinging quality that persists in confined spaces.
Chemistry, Properties & Perfumer Guide
The Chemistry
Hydrotreated heavy naphtha is a complex mixture of hydrocarbons obtained from petroleum distillation and subsequent hydrotreatment to remove sulfur and nitrogen compounds. The hydrotreatment process uses catalysts under hydrogen pressure to saturate aromatic rings and break sulfur-nitrogen bonds. The resulting mixture consists primarily of C9-C16 alkanes and cycloalkanes with minimal aromatic content.
Physical & Chemical Properties
| Appearance | Colorless to pale yellow liquid |
|---|---|
| Boiling Range | 150-290°C |
| Flash Point | 38-60°C |
| Density | 0.75-0.79 g/cm³ |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Industrial solvents | 50-100% | N/A | Primary component in specialty formulations |
| Cleaning products | 10-30% | Up to 50% | Heavy-duty degreasers only |
Classic Accords
Tip: Not recommended for perfumery applications due to strong petroleum odor and safety concerns.
Alternatives & Comparisons
Purified aliphatic hydrocarbon mixture with reduced odor for applications requiring milder solvents.
Highly refined branched alkanes with improved toxicological profile for industrial applications.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not regulated by IFRA due to industrial rather than fragrance use.
GHS Classification
RIFM Assessment
Not evaluated by RIFM as it is not used in fragrance applications.
Sustainability
As a petroleum-derived product, hydrotreated heavy naphtha has significant environmental impacts from extraction to refinement. While hydrotreatment reduces sulfur emissions compared to untreated naphtha, the overall lifecycle still contributes to fossil fuel dependence. Alternative bio-based solvents are being developed but currently lack equivalent performance in heavy industrial applications.
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References
- ATSDR (1995). Toxicological Profile for Petroleum Hydrocarbons. ATSDR Profile
- CONCAWE (2016). Petroleum Hydrocarbon Solvents: Category Assessment and Testing Strategy. CONCAWE Report
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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