LAURETH-4 in Personal Care Formulation: From Emulsifier Selection to Supplier Qualification

LAURETH-4

Get One-Stop Solution from This Page

Behind every stable lotion or liquid foundation, there is a formulator who spent weeks arguing with their emulsifier supplier. LAURETH-4 (CAS 68439-50-9) doesn’t make headlines the way glamorous active ingredients do — but get the wrong batch, and the whole formulation falls apart.

The Batch That Quietly Ruined a Quarter

LAURETH-4 is a polyethylene glycol ether of lauryl alcohol, with an HLB value typically around 9.7. That positioning makes it useful as a co-emulsifier in water-in-oil systems, or as a solubilizer for low-polarity ingredients in lighter oil-and-water emulsions. Formulators who’ve worked with it know it has a tendency to behave differently depending on batch ethoxylation distribution — the average “4 moles EO” masks a distribution, and batches toward the lower end behave more lipophilic than batches toward the higher end.
 
This isn’t a defect. It’s the nature of ethoxylation chemistry. But it’s the reason why phase behavior in your formulation shifts between suppliers, or even between lots from the same supplier.

What the COA Doesn't Capture

A typical LAURETH-4 CoA covers: active content (%), water by Karl Fischer, hydroxyl value, color (Hazen/APHA), and pH of a 1% aqueous solution. Those numbers tell you something, but they don’t tell you the ethoxylation distribution.
 
If your formulation is sensitive to phase stability — especially an emulsion with a narrow processing window — ask the supplier for oligomer distribution data. Not every supplier has it. The ones who do have an analytical capability worth respecting.
 
Also worth asking: is this produced from natural lauryl alcohol or petrochemical-derived? The answer affects your COSMOS, Ecocert, or other natural certification eligibility. Two products with identical CAS numbers can have fundamentally different origin stories.

Picking the Right Grade for Cosmetics 

For leave-on skin care or make-up formulations, your specification should go beyond basic purity. The short list:
 
1,4-dioxane content (a common ethoxylation byproduct) — the EU and US have guidance limits. Most reputable suppliers strip it during purification, but ask for the actual test result, not just a “compliant” statement.
 
Heavy metals — cadmium, lead, arsenic, mercury. The EU Cosmetics Regulation sets strict limits for finished products; your raw material supplier should be testing for these on each production lot.
 
Microbial limits — especially relevant for water-dispersible grades. Total aerobic count, yeast and mold, and absence of specified pathogens per your regional regulatory requirement.
 
Fragrance allergens — if your supplier uses any carrier or solvent during processing, get a statement that no fragrance allergens above threshold are present.
LAURETH-4

Getting the Supply Relationship Right

LAURETH-4 is a volume chemical in China, and pricing competition is intense. That’s good for buyers in terms of cost — but it means low-cost suppliers may be cutting corners on downstream processing or testing. The ethoxylation step itself is commoditized; the differentiation is in purification, QC rigor, and documentation integrity.
 
A few things that separate the serious suppliers from the price-only players: They will give you a detailed SDS that references the correct EU and US regulatory frameworks, not a generic template. They will answer specific questions about their stripping process for 1,4-dioxane. They will tell you lot-to-lot variability on hydroxyl value and color, not just a nominal spec range.
 
Shandong Lookchemical (sdlookchem) produces LAURETH-4 with batch-specific QC covering active content, water, hydroxyl value, color, and 1,4-dioxane level on request. Documentation includes a GHS-compliant SDS aligned to current EU and US requirements, plus origin documentation for natural/synthetic origin declarations where needed.
 
For cosmetic grade inquiries, sdlookchem’s technical team can discuss specific specification requirements, documentation for your regional market, and testing arrangements for qualification batches. MOQ 1 kg; bulk pricing for orders above 10 kg; standard lead time 5–10 business days.
 

Related News Recommendations

Our Factory Equipment