Is PEG 400 Monooleate a single, defined substance?

No. Polyoxyl oleate comprises monoesters and diesters of oleic acid with mixed PEGs and may contain free PEG. The stated “400” is nominal; a formula or CAS alone does not describe every component in a commercial grade.

Can PEG 400 Monooleate replace PEG 400 Dioleate without testing?

No. Mono- and dioleate distributions can differ in free hydroxyl content, interfacial balance, and phase behavior. For a formulation change, assess clarity, viscosity, dispersion or emulsion stability, and compatibility under actual process conditions.

PEG 400 Monooleate CAS 9004-96-0

PEG 400 monooleate is a nonionic polyethylene-glycol oleate ester distribution used as an oil-in-water emulsifier and formulation aid. It is defined by the nominal PEG feed and analytical specification, not as one 99%-pure molecule. The exact EO/INCI designation and monoester-to-diesters/free-PEG balance are grade-specific.

CAS: 9004-96-0
Synonyms: Polyethylene glycol 400 monooleate; PEG-400 monooleate; polyoxyethylene monooleate; PEG-8 oleate (documented designation for some PEG-400 grades)
Einecs: 500-015-7
Molecular Formula: Distribution of polyethylene-glycol monooleates based on nominal PEG 400, with grade-dependent ester and PEG components. No single molecular formula or molecular weight; C28H54O7 is not a valid universal formula for PEG-400 monooleate.
Grade: Confirm the commercial grade code, ester composition, acid, hydroxyl and saponification values, water and physical form against the current TDS and 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 Technical Specifications

2 Applications

3 Storage

4 Safety / Regulatory

Technical Specifications

Property	Specification
CAS Number	9004-96-0
EC / List No.	500-015-7
Identity / Formula	Distribution of polyethylene-glycol monooleates based on nominal PEG 400, with grade-dependent ester and PEG components. No single molecular formula or molecular weight; C28H54O7 is not a valid universal formula for PEG-400 monooleate.
Grade / Specification	Commercial PEG-400 monooleate / declared PEG-oleate grade. Do not describe as a 99%-pure discrete compound. Specify the EO/INCI designation, monoester/diester and free-PEG profile where relevant, acid value, hydroxyl value, saponification value, water, color and HLB/performance target on the TDS and batch COA.
Key physical data	Usually supplied as a liquid or soft material depending on temperature and grade. Appearance, viscosity, cloud/pour behavior and HLB are product-specific; use the offered grade's TDS and COA rather than generic database values.
Packaging	State required quantity, physical form and destination; confirm the current bag or container, liner, net weight, temperature handling and transport requirements before quotation.

Applications

Evaluate as an O/W emulsifier, co-emulsifier, lubricant or wetting/dispersing aid in compatible cleaning, coatings/inks, crop-protection, metalworking and textile formulations. Validate dosage, phase behavior, stability and finished-system performance in the buyer's formulation.

Storage

Store in the original compatible, tightly closed container in a cool, dry, ventilated area, away from heat, ignition sources, moisture and incompatible materials. Prevent contamination and follow the current supplier SDS.

Safety / Regulatory

Use the current supplier SDS, workplace controls and the buyer's risk assessment. Confirm classification, transport status and destination requirements before handling or shipment.

FAQ - Technical & Supply Chain

Q:
Is PEG 400 Monooleate a single, defined substance?

A: No. Polyoxyl oleate comprises monoesters and diesters of oleic acid with mixed PEGs and may contain free PEG. The stated “400” is nominal; a formula or CAS alone does not describe every component in a commercial grade.
Q:
Can PEG 400 Monooleate replace PEG 400 Dioleate without testing?

A: No. Mono- and dioleate distributions can differ in free hydroxyl content, interfacial balance, and phase behavior. For a formulation change, assess clarity, viscosity, dispersion or emulsion stability, and compatibility under actual process conditions.

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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