Does a PEG Monooleate product contain only one monoester molecule?

Not necessarily. Commercial PEG oleates can contain a distribution of PEG chain lengths, monoesters, some diesters, and free PEG. The supplied grade should state its nominal PEG molecular weight and be compared by acid, saponification, and hydroxyl values, water, physical form, and intended formulation performance.

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

Not necessarily. CAS 9004-96-0 can cover PEG oleate grades with different nominal PEG sizes and monoester, diester, free-PEG and free-fatty-acid distributions. Confirm the grade designation and compare acid, saponification and hydroxyl values, water, form and application results.

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

PEG Monooleate, also called Polyethylene Glycol Oleate, is a nonionic oleate ester family identified by CAS No. 9004-96-0 and EC No. 500-015-7. Commercial grades vary with nominal PEG size and the balance of monoester, diester, free PEG and free fatty acid, so the material has no single fixed molecular formula. It is evaluated as an emulsifier, solubilizing aid and lubricity modifier in industrial and technical formulations. Grade selection should be based on the current specification, COA and application testing rather than the shared CAS number alone.

CAS: 9004-96-0
Synonyms: PEG Monooleate, Polyethylene Glycol Oleate, PEG Oleate, Nonionic Emulsifier
Einecs: 500-015-7
Molecular Formula: Variable PEG oleate ester distribution
Grade: Specify nominal PEG size, mono-/diester balance, acid, hydroxyl and saponification values, water, color, physical form and application criteria; compare the current TDS and batch COA.
Package: State required quantity, physical form and destination; confirm the current bag or container, liner, net weight, temperature handling and transport requirements before quotation.

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Product Description

1 Physicochemical profile

2 Application and grade selection

3 Storage and handling

4 Safety and supply documentation

Physicochemical profile

Item	Technical guidance
Product identity	PEG Monooleate, also called Polyethylene Glycol Oleate
CAS / EC	9004-96-0 / 500-015-7
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 every commercial grade under this CAS number
Typical physical form	Amber to brown liquid, paste or semi-solid depending on PEG size, ester distribution and temperature
Key quality controls	PEG size, acid value, saponification value, hydroxyl value, water, color, physical form and any stated monoester content

Application and grade selection

PEG Monooleate is evaluated as a nonionic emulsifier, solubilizing aid and lubricity modifier in technical formulations. The required PEG size and ester distribution should be selected from the target formulation rather than from the CAS number alone.

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, food or pharmaceutical use requires a grade supported by the relevant manufacturing, impurity and compliance documentation.

Storage and handling

Store sealed in a cool, dry and ventilated place. Protect the material from moisture, excessive heat and prolonged air exposure. If the grade becomes more viscous or semi-solid at lower temperature, condition it only within the supplier’s recommended range and mix uniformly before sampling.

Safety and supply documentation

Handling precautions, transport classification and waste disposal must follow the SDS for the exact grade and carrier system. Do not rely on generalized low-toxicity or flash-point claims copied from a different PEG oleate grade.

A purchase inquiry should identify the reference grade or PEG size, application, required analytical limits, package, volume, destination and requested COA, TDS and SDS.

For related oleate ester pages, compare PEG 400 Dioleate, PEG 600 Dioleate, and Glyceryl Monooleate.

FAQ - Technical & Supply Chain

Q:
Does a PEG Monooleate product contain only one monoester molecule?

A: Not necessarily. Commercial PEG oleates can contain a distribution of PEG chain lengths, monoesters, some diesters, and free PEG. The supplied grade should state its nominal PEG molecular weight and be compared by acid, saponification, and hydroxyl values, water, physical form, and intended formulation performance.
Q:
Is generic PEG Monooleate the same grade as PEG 400 Monooleate?

A: Not necessarily. CAS 9004-96-0 can cover PEG oleate grades with different nominal PEG sizes and monoester, diester, free-PEG and free-fatty-acid distributions. Confirm the grade designation and compare acid, saponification and hydroxyl values, water, form and application results.

Ordering & Documentation

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

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

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

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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