Does CAS 6540-99-4 identify Laureth-5 or Laureth-10?

CAS 6540-99-4 identifies polyoxyethylene (10) lauryl ether, commonly Laureth-10 or C12E10. It should not be quoted as Laureth-5, which has a lower nominal EO level.

Which Laureth-10 specifications should be compared?

Compare nominal EO, hydroxyl value, water, color, acidity or pH, physical form and any supplier-defined cloud or congealing test using aligned analytical methods.

Can Laureth-10 replace a lower-EO lauryl ether at the same dosage?

Not automatically. Rebalance the surfactant system and compare solubility, emulsion behavior, viscosity, clouding and temperature stability in the complete formulation.

What documents are needed for cosmetic-grade Laureth-10?

Request the exact-grade specification, recent COA, TDS, SDS, composition and impurity statements, plus any destination-market documents. CAS identity alone does not establish cosmetic suitability.

What is needed for a Laureth-10 quotation?

Provide nominal EO, reference COA or grade, application, analytical limits, quantity, package, destination and required cosmetic or technical documents.

Polyoxyethylene Lauryl Ether-10 (Laureth-10) CAS 6540-99-4

Polyoxyethylene Lauryl Ether-10 , also called Laureth-10 or C12E10 , is identified by CAS No. 6540-99-4 . The discrete C12E10 structure has formula C32H66O11 . This CAS number does not identify Laureth-5: the discrete Laureth-5/C12E5 substance is associated with CAS 3055-95-6. Buyers should therefore match the offered material by CAS, nominal EO level, composition, physical form and COA before formulation testing.

CAS: 6540-99-4
Synonyms: Laureth-10, Polyoxyethylene (10) Lauryl Ether, Decaethylene Glycol Monododecyl Ether, C12E10, PEG-10 Lauryl Ether
Molecular Formula: C₃₂H₆₆O₁₁
Grade: Confirm the nominal EO or PO level, feedstock range, active matter, water, physical form and relevant analytical values 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 Identity and physicochemical profile

2 Applications and grade selection

3 Storage and handling

4 Safety, documentation and procurement

Identity and physicochemical profile

Item	Technical guidance
Correct identity	Polyoxyethylene (10) lauryl ether; Laureth-10; C12E10
CAS number	6540-99-4
Formula / molecular weight	C₃₂H₆₆O₁₁ / 626.9 g/mol
EO level	Ten ethylene-oxide units in the discrete C12E10 identity; commercial fatty-alcohol grades may still require distribution data
Identity boundary	Laureth-5 is C12E5 and is not the correct name for CAS 6540-99-4
Key quality controls	Nominal EO, hydroxyl value, water, color, physical form, cloud point or other supplier-defined performance tests

Applications and grade selection

Laureth-10 is evaluated as a nonionic emulsifying, wetting, dispersing or cleansing surfactant. Suitability depends on the exact commercial composition, phase ratio, temperature, electrolyte, pH, co-surfactants and process; a CAS match alone does not establish equivalent formulation performance.

Do not substitute Laureth-5 and Laureth-10 solely because both are lauryl alcohol ethoxylates; the different EO level changes hydrophilicity and phase behavior.
Compare the current and proposed grades using equivalent test methods, then run emulsion, clarity, viscosity and storage-stability trials.
Cosmetic or other regulated use requires documentation for the exact grade and destination market.

Storage and handling

Keep the package closed in a dry, ventilated area within the supplier’s stated temperature range. Physical form can change with temperature; use the exact TDS for warming, homogenization and sampling rather than applying a generic refrigerated-storage instruction.

Safety, documentation and procurement

Consult the current SDS for eye and skin protection, ventilation, spill response, transport and disposal. For quotation, provide the required identity, nominal EO, reference COA, application, quantity, package, destination and documentation scope.

For shorter and higher EO lauryl or fatty alcohol ethoxylate grades, compare Laureth-4, AEO-7, and AEO-20 / MOA-20.

FAQ - Technical & Supply Chain

Q:
Does CAS 6540-99-4 identify Laureth-5 or Laureth-10?

A: CAS 6540-99-4 identifies polyoxyethylene (10) lauryl ether, commonly Laureth-10 or C12E10. It should not be quoted as Laureth-5, which has a lower nominal EO level.
Q:
Which Laureth-10 specifications should be compared?

A: Compare nominal EO, hydroxyl value, water, color, acidity or pH, physical form and any supplier-defined cloud or congealing test using aligned analytical methods.
Q:
Can Laureth-10 replace a lower-EO lauryl ether at the same dosage?

A: Not automatically. Rebalance the surfactant system and compare solubility, emulsion behavior, viscosity, clouding and temperature stability in the complete formulation.
Q:
What documents are needed for cosmetic-grade Laureth-10?

A: Request the exact-grade specification, recent COA, TDS, SDS, composition and impurity statements, plus any destination-market documents. CAS identity alone does not establish cosmetic suitability.
Q:
What is needed for a Laureth-10 quotation?

A: Provide nominal EO, reference COA or grade, application, analytical limits, quantity, package, destination and required cosmetic or technical documents.

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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