Is PEG 400 Monooleate the same as PEG 400?

No. PEG 400 is the nominal polyethylene-glycol starting material; PEG 400 Monooleate is an oleate ester product. Commercial monooleate can contain monoesters, diesters and free PEG in grade-dependent proportions. The number 400 does not specify a single molecular weight for the finished ester mixture.

Can PEG 400 Monooleate replace PEG 400 Dioleate without testing?

No. Monooleate and dioleate grades differ in ester and free-hydroxyl balance and can behave differently at the oil-water interface. A substitution needs testing of dosage, phase behavior, viscosity, emulsion stability and compatibility under the intended process conditions.

Does PEG 400 Monooleate always have the same HLB or INCI name?

No. HLB and the INCI or EO designation are grade-specific. PEG-8 Oleate is a documented designation for some PEG-400 monooleate grades, but CAS 9004-96-0 alone does not determine the INCI name. Use the designation and properties of the quoted grade rather than transferring another product’s catalogue values.

PEG 400 Monooleate CAS 9004-96-0

PEG 400 Monooleate (CAS 9004-96-0), also called polyethylene glycol 400 monooleate, is a nonionic mixture of polyethylene-glycol oleate esters used as an oil-in-water emulsifier and formulation aid. The INCI name PEG-8 Oleate applies to some PEG-400 monooleate grades and is used only when identified in the supplied grade's TDS. Grade specifications cover the EO/INCI designation, monoester-to-diester and free-PEG balance, acid value, hydroxyl value, saponification value, water, color and physical form. COA, TDS and SDS are available for specification and handling information.

CAS: 9004-96-0
Synonyms: Polyethylene glycol 400 monooleate; PEG-400 monooleate; polyoxyethylene monooleate; PEG-8 oleate (documented designation for some PEG-400 grades)
Molecular Formula: A mixture of polyethylene-glycol oleate esters based on nominal PEG 400, with grade-dependent monoester, diester and free-PEG components. No single molecular formula or molecular weight describes the commercial product.
Grade: Commercial PEG-400 monooleate. The TDS defines the grade designation, composition profile and specifications; the COA reports agreed batch test results.
Package: Drums or bulk. Container type, liner and net weight are specified in the quotation for the order and destination.
EC / NLP No.: 500-015-7 (PEG monooleate family reference; the designation for the quoted grade is stated in its SDS).

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Product Description

1 Technical Specifications

2 Applications and emulsifier selection

3 Quality data and chromatographic profiles

4 Storage and handling

5 Safety and shipment

Technical Specifications

Property	Specification
CAS Number	9004-96-0
EC / NLP No.	500-015-7 (PEG monooleate family reference; the designation for the quoted grade is stated in its SDS).
Composition	Polyethylene-glycol oleate ester mixture based on nominal PEG 400. Monoester, diester and free-PEG proportions depend on the commercial grade; there is no single formula or fixed molecular weight.
Grade specifications	Grade designation, ester/free-PEG profile, acid value, hydroxyl value, saponification value, water, color and physical form. Specifications and test methods are defined in the TDS; the COA reports agreed batch release items.
Physical properties	Normally a liquid; handling characteristics depend on grade and temperature. Viscosity is reported at a stated temperature. HLB is a grade-specific formulation reference. Where applicable, cloud point includes the test medium and concentration, and pour point includes the test method.
Packaging	Drums or bulk. Container type, liner and net weight are specified in the quotation for the order and destination.

Applications and emulsifier selection

PEG 400 Monooleate (PEG400MO) is used as a nonionic emulsifier, co-emulsifier and lubricity aid in metalworking and other industrial formulations. Performance depends on the oil phase, water quality, dosage, temperature and other formulation components.

For PEG oleate grade comparisons, PEG 400 Dioleate changes the ester and free-hydroxyl balance, while PEG 600 Dioleate also changes the nominal PEG chain size. Compare the documented grades and test emulsion stability, viscosity and compatibility in the intended formulation.

Polysorbate 80 is an ethoxylated sorbitan oleate emulsifier option for compatible oil-in-water systems. Glyceryl Monooleate is a glycerol-based, lipophilic co-emulsifier and lubricant component for suitable industrial emulsifier blends. Neither is a direct one-for-one substitute for PEG 400 Monooleate; blend selection requires formulation testing.

Quality data and chromatographic profiles

Acid value, hydroxyl value and saponification value are bulk quality indicators, reported in mg KOH/g with the test method. Water can be determined by a suitable Karl Fischer method and reported as a mass percentage. These measurements do not independently quantify each monoester, diester or free-PEG fraction.

For composition-sensitive applications, we can provide an appropriate LC/HPLC chromatographic profile and supporting test information. The report identifies the method, separation, detector and result basis. Peak-area percentage is not a mass percentage unless supported by the required calibration.

Storage and handling

Keep containers tightly closed in a cool, dry, ventilated area. Prevent moisture entry and contamination. Use compatible containers and follow the storage, handling and workplace protection instructions in the SDS for the quoted grade.

Safety and shipment

The SDS for the quoted grade provides its hazard and transport information. Shipment documentation and packaging are prepared for that grade and the destination requirements.

FAQ - Technical & Supply Chain

Q:
Is PEG 400 Monooleate the same as PEG 400?

A: No. PEG 400 is the nominal polyethylene-glycol starting material; PEG 400 Monooleate is an oleate ester product. Commercial monooleate can contain monoesters, diesters and free PEG in grade-dependent proportions. The number 400 does not specify a single molecular weight for the finished ester mixture.
Q:
Can PEG 400 Monooleate replace PEG 400 Dioleate without testing?

A: No. Monooleate and dioleate grades differ in ester and free-hydroxyl balance and can behave differently at the oil-water interface. A substitution needs testing of dosage, phase behavior, viscosity, emulsion stability and compatibility under the intended process conditions.
Q:
Does PEG 400 Monooleate always have the same HLB or INCI name?

A: No. HLB and the INCI or EO designation are grade-specific. PEG-8 Oleate is a documented designation for some PEG-400 monooleate grades, but CAS 9004-96-0 alone does not determine the INCI name. Use the designation and properties of the quoted grade rather than transferring another product’s catalogue values.

Ordering & Documentation

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Storage & Shipping

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