Dipropylene glycol (isomer unspecified) (CAS 25265-71-8) — Citrus Carrier Note Fragrance Ingredient
Dipropylene glycol (isomer unspecified)
CAS 25265-71-8
What Is Dipropylene glycol (isomer unspecified)?
Dipropylene glycol is a synthetic solvent commonly used as a carrier in perfumes, cosmetics, and household products. It helps dissolve fragrance oils and stabilize formulations. While odorless itself, it plays a crucial supporting role by ensuring even distribution of scent molecules and improving product shelf life.
Safety Profile
GENERALLY SAFEWhat Does Dipropylene glycol (isomer unspecified) Smell Like?
Dipropylene glycol is essentially odorless, functioning as a neutral carrier rather than a fragrant material. Its lack of scent makes it ideal for maintaining the purity of fragrance compositions without adding any olfactory interference. In formulations, it provides a smooth, slightly viscous texture that helps blend volatile top notes with heavier base materials.
Chemistry, Properties & Perfumer Guide
The Chemistry
Dipropylene glycol is a synthetic organic compound belonging to the glycol ether family, formed as a byproduct of propylene glycol production. It exists as a mixture of isomers (primarily 2,2′-oxybispropan-1-ol and 2-(2-hydroxypropoxy)propan-1-ol). Industrial synthesis typically involves the hydration of propylene oxide under controlled conditions. The material’s low volatility and excellent solubility properties make it valuable as a fragrance carrier.
Physical & Chemical Properties
| Boiling Point | 232 °C |
|---|---|
| Density | 1.022 g/cm³ |
| Flash Point | 124 °C |
| Vapor Pressure | 0.01 mmHg at 20°C |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 10-30% | Up to 50% | Solvent for fragrance oils |
| Cosmetics | 5-20% | Up to 30% | Humectant and carrier |
| Household Products | 1-10% | Up to 15% | Stabilizer for fragrances |
Classic Accords
Tip: Use as a neutral solvent to extend top notes without altering fragrance character.
Alternatives & Comparisons
More volatile alternative with similar solvent properties but slightly higher odor potential.
Higher molecular weight glycol with greater viscosity for specialized applications.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not restricted by IFRA – classified as safe for use in fragrances.
RIFM Assessment
RIFM safety assessment confirms low risk profile for fragrance use.
Sustainability
As a petrochemical derivative, dipropylene glycol’s environmental impact stems from fossil fuel extraction. However, its high efficiency as a carrier reduces overall material usage in formulations. The industry is exploring bio-based glycol alternatives, though none yet match dipropylene glycol’s performance and cost profile.
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References
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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