Poly[oxy(methyl-1,2-ethanediyl)], .alpha.-butyl-.omega.-hydroxy- (CAS 9003-13-8) — Citrus Non-fragrance Note Fragrance Ingredient

ByThe Good Scents
Citrus · Floral

Poly[oxy(methyl-1,2-ethanediyl)], .alpha.-butyl-.omega.-hydroxy-

CAS 9003-13-8

Origin
synthetic
Note
Non-fragrance
IFRA
Generally safe
Data as of: Apr 2026

What Is Poly[oxy(methyl-1,2-ethanediyl)], .alpha.-butyl-.omega.-hydroxy-?

This synthetic polymer is primarily used as an emulsifier and stabilizer in cosmetic formulations. Consumers encounter it in lotions, creams, and some hair care products where it helps blend ingredients. While not a fragrance ingredient itself, it plays a crucial role in maintaining scent stability and product texture in perfumed formulations.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ Approved for cosmetic use
✓ Non-irritating at typical usage levels
CAS
9003-13-8
Formula
Mixture
MW
Variable
Odor Family
Citrus · Floral
Layer 1 · Enthusiast

What Does Poly[oxy(methyl-1,2-ethanediyl)], .alpha.-butyl-.omega.-hydroxy- Smell Like?

This material is odorless and serves purely functional purposes in formulations. As a polymer, it lacks volatile components that would contribute to fragrance profiles. Its primary role is to modify physical properties rather than impart scent characteristics.

Layer 2

2D Molecular Structure

Butoxypolypropylene glycol

SMILES: CCCCOCCCO |lp:4:2,8:2,Sg:n:7,6,5,4::ht|

Chemistry, Properties & Perfumer Guide

The Chemistry

Poly[oxy(methyl-1,2-ethanediyl)], .alpha.-butyl-.omega.-hydroxy- is a synthetic polyethylene glycol derivative polymer. It’s produced through polymerization of ethylene oxide with butanol as an initiator. The resulting polymer has hydrophilic polyether chains terminated with hydroxyl groups, making it useful as a nonionic surfactant. The molecular weight distribution depends on polymerization conditions.

Physical & Chemical Properties

AppearanceColorless viscous liquid
SolubilityWater-soluble

Perfumer Guide

Note Position
Non-fragrance
Volatility
Non-volatile
Blending
Functional additive
ApplicationTypical %RangeNotes
Cosmetic Emulsions1-5%0.5-10%Stabilizer and emulsifier
Hair Care0.5-3%0.1-5%Conditioning agent

Classic Accords

Tip: Use as a solubilizer for fragrance oils in aqueous systems.

Alternatives & Comparisons

1
PEG-40 Hydrogenated Castor Oil CAS 61788-85-0

Another nonionic surfactant with similar emulsifying properties but derived from natural sources.

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

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

IFRA Status

Not restricted by IFRA as it’s not a fragrance material.

RIFM Assessment

Not evaluated by RIFM as it’s not a fragrance ingredient.

Sustainability

As a synthetic polymer, this material is petroleum-derived but requires relatively low energy inputs during manufacturing. Its high efficiency at low concentrations reduces overall environmental impact compared to some natural emulsifiers that require agricultural land use.

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References

  1. Cosmetic Ingredient Review Expert Panel (2006). Safety assessment of polyethylene glycol (PEG) compounds. PMID 17026679

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

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Ingredient Data Sheet

CAS 9003-13-8
Data Sources & Attribution
Physical 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.

Physicochemical Properties

DTXSID: DTXSID3034404

Physical Properties

Density 0.949 g/cm^3🔬 EPA CTX
Boiling Point 306 °C🔬 EPA CTX
Melting Point -20 °C🔬 EPA CTX
Flash Point 141.4 °C🔬 EPA CTX

Partition & Solubility

LogP (Octanol-Water) 1.185 dimensionless💻 Computed

Transport Properties

Vapor Pressure 0.001 mmHg🔬 EPA CTX

Molecular Descriptors

Topological Polar Surface Area 29.46 Ų💻 Computed
H-Bond Donors 1 count💻 Computed
H-Bond Acceptors 2 count💻 Computed
Rotatable Bonds 6 count💻 Computed
Aromatic Rings 0 count💻 Computed

Data Sources:

🔬 EPA Experimental data from U.S. EPA CompTox Chemicals Dashboard & CTX APIs. 📊 OPERA Predicted using EPA's OPERA QSAR models. 💻 Computed Calculated from SMILES using RDKit.

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