C9-12-Iso-alkanes (CAS 90622-57-4) — Citrus Base Note Fragrance Ingredient

ByThe Good Scents
Citrus · Floral

C9-12-Iso-alkanes

CAS 90622-57-4

Origin
synthetic
Note
Base
IFRA
Generally safe
Data as of: Apr 2026

What Is C9-12-Iso-alkanes?

C9-12-Iso-alkanes are synthetic hydrocarbon solvents commonly used in fragrance formulations and cosmetic products. They are odorless and colorless, often serving as a base or carrier for other fragrance ingredients. These compounds are valued for their stability, low toxicity, and ability to enhance the performance of fragrances by improving solubility and longevity.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ Low toxicity and well-tolerated in cosmetic applications
✓ Non-irritating and non-sensitizing
CAS
90622-57-4
Formula
Mixture
MW
Variable
Odor Family
Citrus · Floral
Layer 1 · Enthusiast

What Does C9-12-Iso-alkanes Smell Like?

C9-12-Iso-alkanes are virtually odorless, making them an ideal neutral base for fragrance formulations. Their lack of scent allows them to blend seamlessly with other ingredients without altering the intended olfactory profile. They provide a clean, non-reactive foundation that enhances the performance of top, heart, and base notes without contributing any additional aromatic characteristics.

Layer 2

Chemistry, Properties & Perfumer Guide

The Chemistry

C9-12-Iso-alkanes are branched-chain aliphatic hydrocarbons derived from petroleum refining. They are synthesized through the oligomerization of lower molecular weight alkenes or by the isomerization of linear alkanes. These compounds are characterized by their high purity and stability, making them suitable for use in fragrance and cosmetic applications. Their branched structure contributes to their low viscosity and excellent solvent properties.

Physical & Chemical Properties

Boiling PointNot specified
DensityNot specified
Flash PointNot specified
Vapor PressureNot specified

Perfumer Guide

Note Position
Base
Volatility
Low
Blending
Excellent
ApplicationTypical %RangeNotes
Fine Fragrance5-20%Up to 30%Used as a solvent and carrier
Cosmetics10-25%Up to 50%Enhances formulation stability

Classic Accords

Tip: Use as a neutral base to improve the solubility and stability of fragrance oils.

Alternatives & Comparisons

1
Isododecane CAS 13475-82-6

A lighter alternative with similar solvent properties, often used in sprays and aerosols.

2
Mineral Oil CAS 8042-47-5

A more viscous option for formulations requiring higher lubrication.

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

General reference only. Consult current IFRA Standards Library before formulating.

IFRA Status

Not restricted by IFRA. Suitable for use in all fragrance applications.

RIFM Assessment

RIFM considers C9-12-Iso-alkanes safe for use in fragrances based on current data.

Sustainability

C9-12-Iso-alkanes are derived from petroleum, raising environmental concerns regarding sourcing and biodegradability. However, their synthetic origin allows for consistent quality and reduced variability compared to natural alternatives. Efforts are underway to develop more sustainable production methods and bio-based alternatives.

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References

  1. PubChem. C9-12-Iso-alkanes. PubChem

Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.

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