Does PEG Monooleate mean 100% monoester?

No. Commercial PEG oleates can contain different PEG chain lengths, monoesters, diesters and free PEG. Monoester content needs a defined analytical method and reporting basis; the product name or CAS number alone does not establish purity.

Is generic PEG Monooleate the same grade as PEG 400 Monooleate?

Not necessarily. PEG Monooleate is a product family; PEG 400 Monooleate specifies a nominal PEG molecular weight. The same CAS number does not establish an identical ester distribution or grade. Compare the offered grade designation, EO/INCI description, analytical limits and formulation performance.

PEG Monooleate (Polyethylene Glycol Oleate) CAS 9004-96-0

PEG Monooleate (CAS 9004-96-0), also called polyethylene glycol oleate or PEG oleate, is a nonionic oleate ester family used as an emulsifier, solubilizing aid and lubricity modifier. Commercial grades differ in nominal PEG molecular weight and the balance of monoesters, diesters and free PEG. Acid, saponification and hydroxyl values, water content, color and physical form help match the grade to the intended formulation. COA, TDS and SDS are available for specification and handling information.

CAS: 9004-96-0
Synonyms: PEG Monooleate, Polyethylene Glycol Oleate, PEG Oleate
Molecular Formula: No single fixed formula applies to all commercial PEG oleate grades.
Grade: Nominal PEG molecular weight and monoester/diester distribution; acid, saponification and hydroxyl values (mg KOH/g), water, color and physical form. Specifications and methods are stated in the TDS; the COA reports agreed batch release items.
Package: Drums or bulk; confirm container, liner, net weight and handling for your order and destination.

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Product Description

1 Physicochemical profile

2 Application and grade selection

3 Quality data and ester distribution

4 Storage and handling

5 Safety and supply documentation

Physicochemical profile

Item	Technical guidance
Product identity	PEG Monooleate, also called Polyethylene Glycol Oleate
CAS Number	9004-96-0
Composition	Variable PEG oleate ester distribution containing grade-dependent proportions of monoester, diester, free PEG and free fatty acid
Molecular formula	No single fixed formula applies to all commercial PEG oleate grades.
Typical physical form	Pale yellow to amber or brown liquid, paste or semi-solid, depending on the grade, ester distribution and temperature.
Key quality controls	Nominal PEG molecular weight; acid, saponification and hydroxyl values (mg KOH/g); water content, color, physical form and any specified monoester content with its method and reporting basis.

Application and grade selection

PEG Monooleate is a nonionic emulsifier, solubilizing aid and lubricity modifier for technical formulations. Grade selection depends on the oil phase, water quality, dosage, temperature and other formulation components.

Metalworking and industrial-cleaning trials should compare emulsion stability, corrosion behavior, foam and lubricity.
Textile and process-aid trials should verify wetting, antistatic or lubrication performance on the actual substrate.
Cosmetic or pharmaceutical formulations require a grade with the appropriate impurity profile and documentation for the intended use; the generic product name does not establish a compendial grade.

For a specification based on nominal PEG 400, compare PEG 400 Monooleate. PEG 400 Dioleate and PEG 600 Dioleate provide comparisons of ester distribution and nominal PEG molecular weight. These grades are not interchangeable solely because their names or CAS numbers are similar.

Glyceryl Monooleate is a nonethoxylated, more lipophilic oleate co-emulsifier option for suitable blends. It has a different polyol group and composition from PEG Monooleate; selection depends on the complete formulation.

Quality data and ester distribution

Acid, saponification and hydroxyl values are bulk quality indicators reported in mg KOH/g. Together with the grade designation and water content, they help compare PEG oleates, but no single value establishes monoester purity or the complete ester distribution. Physical-property results need the stated temperature and test conditions.

Composition-analysis data, including an appropriate HPLC chromatographic profile, can be provided when ester distribution is part of the agreed specification. HPLC with an evaporative light-scattering detector (ELSD) is one approach to separating monoester and diester components. The method and calibration must suit the grade; peak-area percentage is not a mass percentage without appropriate calibration.

Storage and handling

Keep containers tightly closed in a cool, dry, ventilated area. Prevent moisture entry, excessive heat and prolonged air exposure. If the grade becomes viscous or semi-solid at lower temperature, use the conditioning range stated in its TDS and mix uniformly before sampling.

Safety and supply documentation

The SDS for the quoted grade provides its handling precautions, hazard and transport information, and disposal guidance.

We can provide the Certificate of Analysis (COA), Technical Data Sheet (TDS) and Safety Data Sheet (SDS) for the selected grade. The TDS defines grade specifications and methods; the COA reports the agreed batch release items.

For a quotation, send the reference grade or required nominal PEG molecular weight, quantity and destination. Add the application or key analytical limits if known.

FAQ - Technical & Supply Chain

Q:
Does PEG Monooleate mean 100% monoester?

A: No. Commercial PEG oleates can contain different PEG chain lengths, monoesters, diesters and free PEG. Monoester content needs a defined analytical method and reporting basis; the product name or CAS number alone does not establish purity.
Q:
Is generic PEG Monooleate the same grade as PEG 400 Monooleate?

A: Not necessarily. PEG Monooleate is a product family; PEG 400 Monooleate specifies a nominal PEG molecular weight. The same CAS number does not establish an identical ester distribution or grade. Compare the offered grade designation, EO/INCI description, analytical limits and formulation performance.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

Tell us which documents your procurement team needs. Before an order, we will check whether the quoted source can provide them for the offered lot.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Ask whether samples, trial quantities or repeat orders are possible. We will check each request against the sourced product and current offer.

Storage & Shipping

Product-specific conditions are confirmed before order.

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