Is PEG 400 dioleate the same as PEG 400 monooleate?

No. The names describe diester-type and monoester-type PEG grades. Commercial products contain distributions of PEG chains and ester components rather than one pure molecule. Their hydroxyl values and ester compositions can differ, changing emulsification and formulation behaviour, so they are not automatic replacements for each other.

Which quality data matter on a PEG 400 dioleate COA?

Acid value, hydroxyl value and saponification value, reported in mg KOH/g, plus water content and the agreed appearance or viscosity requirements are useful comparison points. If ester composition is part of the specification, the monoester/diester profile also needs its test method and reporting basis. Acceptance limits are set for the quoted grade.

Can another PEG 400 dioleate grade replace the current grade directly?

Matching the CAS number and nominal PEG chain grade does not establish identical performance. Compare the quality specification and run a side-by-side formulation trial, especially for emulsion stability, viscosity and lubrication. Ester composition, PEG-chain distribution and the rest of the formulation affect the result.

PEG 400 Dioleate CAS 9005-07-6

PEG 400 dioleate (PEG400DO, CAS 9005-07-6) is a liquid nonionic oleic-acid ester based on nominal PEG 400. It is used as an emulsifier and formulation aid in metalworking fluids, lubricants and textile auxiliaries. The commercial product contains a distribution of PEG chains and ester components; the quoted grade is selected by its quality specification and performance in the intended formulation.

CAS: 9005-07-6
Synonyms: Polyethylene glycol 400 dioleate; PEG-400 dioleate; PEG400DO; polyoxyethylene dioleate (nominal PEG 400 grade)
Molecular Formula: Oleic-acid diester product based on nominal PEG 400; commercial PEG-chain and ester-composition distribution, with no single molecular formula or molar mass.
Grade: Commercial industrial PEG 400 dioleate; acid value, hydroxyl value, saponification value and water requirements are specified for the quoted grade.
Package: Drum or IBC packaging; container compatibility and net weight are specified with the quotation.

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Product Description

1 Parameters

2 Grade and Formulation Selection

3 Quality Data and Available Documents

4 Storage and Handling

Parameters

CAS Number	9005-07-6
Chemical Type	Nonionic polyethylene glycol oleic-acid diester product, nominal PEG 400 grade.
Composition / Formula	Commercial PEG-chain and ester-composition distribution; no single molecular formula or molar mass.
Grade / Specification	Industrial PEG 400 dioleate; acid, hydroxyl and saponification values, water and agreed appearance or viscosity requirements.
Physical Form	Liquid at normal handling temperatures; appearance, flow and water-dispersion behaviour depend on grade and temperature.
Packaging	Drum or IBC requirements, net weight and container compatibility are specified with the quotation.

Grade and Formulation Selection

The number 400 identifies the approximate average molar mass, in g/mol, of the PEG starting chain, not the molar mass of the finished dioleate or a fixed number of ethylene oxide units. Commercial ester and chain-length distributions influence the grade’s behaviour.

PEG 400 dioleate is used in compatible oil-rich emulsions, metalworking fluids, lubricants and textile auxiliaries. Emulsion type, dosage and performance depend on the full oil phase, co-emulsifiers, dilution and operating conditions; water dispersibility is not the same as unrestricted water solubility.

PEG 600 dioleate offers a longer average PEG chain for grade comparison. PEG 400 monooleate differs in esterification class and remaining hydroxyl functionality. These options require a formulation comparison rather than substitution on CAS number alone.

In metalworking and lubricant formulations, glyceryl monooleate can be considered for its emulsifying and lubricating role, while pentaerythritol tetraoleate is a distinct lubricating ester component. Their functions and compatibility need to match the formulation; neither is chemically identical to PEG 400 dioleate.

Quality Data and Available Documents

Acid value, hydroxyl value and saponification value are reported in mg KOH/g. Water content, appearance and viscosity are specified with the applicable method and test conditions. These measurements describe different aspects of the grade and do not, individually, establish a pure diester percentage.

An ester-composition profile is useful when monoester, diester and free PEG proportions are relevant to the specification. HPLC with evaporative light-scattering detection (HPLC–ELSD) is one technique for this purpose when validated for the grade and calibrated for the components being reported. Peak-area percentages alone do not establish mass-fraction purity.

COA (Certificate of Analysis), TDS (Technical Data Sheet) and SDS (Safety Data Sheet) can be provided for the quoted PEG 400 dioleate grade. Applicable chromatographic quality documentation can also be provided when an ester-composition profile is part of the specification. For a quotation, the intended use, required specification, quantity and delivery destination help select the grade and packing.

Storage and Handling

Keep containers tightly closed, dry and protected from contamination. Storage temperature, handling precautions and transport information follow the TDS and SDS supplied for the quoted grade.

FAQ - Technical & Supply Chain

Q:
Is PEG 400 dioleate the same as PEG 400 monooleate?

A: No. The names describe diester-type and monoester-type PEG grades. Commercial products contain distributions of PEG chains and ester components rather than one pure molecule. Their hydroxyl values and ester compositions can differ, changing emulsification and formulation behaviour, so they are not automatic replacements for each other.
Q:
Which quality data matter on a PEG 400 dioleate COA?

A: Acid value, hydroxyl value and saponification value, reported in mg KOH/g, plus water content and the agreed appearance or viscosity requirements are useful comparison points. If ester composition is part of the specification, the monoester/diester profile also needs its test method and reporting basis. Acceptance limits are set for the quoted grade.
Q:
Can another PEG 400 dioleate grade replace the current grade directly?

A: Matching the CAS number and nominal PEG chain grade does not establish identical performance. Compare the quality specification and run a side-by-side formulation trial, especially for emulsion stability, viscosity and lubrication. Ester composition, PEG-chain distribution and the rest of the formulation affect the result.

Ordering & Documentation

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

Documents

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Quotation

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Storage & Shipping

Product-specific conditions are confirmed before order.

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