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SODIUM LAURETH-4 CARBOXYLATE.

Valuable CAS 33939-64-9 / 38975-04-1 / CLEANSING, FOAMING, SURFACTANT - CLEANSING

Sodium Laureth-4 Carboxylate is a mild anionic surfactant derived from natural alcohols, highly valued for its gentle yet effective cleansing properties. It produces a stable, rich lather without causing excessive degreasing, making it suitable for a wide range of skin and hair formulations.

Summary

cleansing foaming surfactant

Science

Mechanism of Action

As an anionic surfactant, Sodium Laureth-4 Carboxylate functions by reducing the surface tension between oil and water, enabling the emulsification and removal of dirt, oils, and particulate matter from the skin and hair. It acts as a primary cleansing and foaming agent, generating a robust and stable lather while maintaining good tolerance to hard water and preventing excessive drying.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 A 5% detergent solution containing Sodium Laureth-4 Carboxylate, along with Sodium Laureth Sulfate (SLES) and Lauryl Glucoside, demonstrated superior mildness in a skin soak test. This formulation resulted in no significant reduction in skin hydration (cutaneous capacitance) and notably less erythema or dryness when compared to traditional soap or SLES used alone.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 6 – 8
0 7 14

Stability

This ingredient exhibits excellent stability, particularly when maintained at a pH above 4. It generates high foaming under weakly acidic to neutral conditions, with foam stability unaffected by pH variations, offering broad formulation flexibility. For optimal compatibility, a pH range of 6.0-8.0 is recommended. Storage below 30°C and protection from moisture ensure best performance.

Synergies

  • Sodium Laureth Sulfate (SLES)
  • Lauryl Glucoside

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Low

Sodium Laureth-4 Carboxylate has not undergone a specific safety assessment by an industry panel such as the Cosmetic Ingredient Review (CIR) Expert Panel, though related surfactants have been evaluated. The U.S. FDA recognizes it as 'Generally Recognized as Safe' (GRAS) for use in household cleaners, a status not directly applicable to cosmetic applications. There is a potential for contamination from toxic manufacturing impurities like ethylene oxide and 1,4-dioxane.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Sodium Laureth-4 Carboxylate is a valuable, mild cleansing and foaming agent suitable for all skin types, contributing to gentle yet effective product formulations, though direct cosmetic safety assessments are pending.

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