Undeceth-5

What is Undeceth-5?

Undeceth-5 is a synthetic non-ionic surfactant produced by reacting undecyl alcohol with approximately five moles of ethylene oxide, creating a polyoxyethylene chain. This structure gives it hydrophilic and lipophilic properties, making it ideal for cosmetic formulations. It appears in rinse-off products like shampoos, body washes, and facial cleansers, as well as leave-on items such as lotions and creams. In products, it works by lowering surface tension to remove oils, dirt, and makeup effectively during rinsing. As an emulsifier, it forms a protective film at the oil-water interface, preventing separation and ensuring even distribution of ingredients for a smooth application feel. Its relatively short ethoxylate chain contributes to milder performance compared to longer-chain variants, supporting its use in everyday personal care routines.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Surfactant
Lowers surface tension to enable cleansing, emulsifying, and foaming; central to shampoos, body washes, and many emulsions and micellar systems.
Emulsifying agent
Enables stable mixing of oil and water phases by forming an interfacial film, helping create lotions, creams, and cleansers with consistent texture.

Benefits

Enables thorough yet gentle cleansing by lifting away impurities without harshness.

Supports stable product textures by blending oil and water phases seamlessly.

Contributes to foaming action in washes for a satisfying user experience.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals seeking mild cleansers for daily use on normal or combination skin.
Those with rare allergies to polyethylene glycol derivatives.
Users of emulsion-based products like lotions needing consistent blend.
Individuals sensitive to any surfactants, regardless of mildness.
People preferring non-comedogenic surfactants in their routines.
People avoiding synthetic ethoxylated compounds on principle.

Safety Notes

  • Rated low hazard by safety assessments for cosmetic use.
  • Minimal skin and eye irritation potential in typical concentrations.

Frequently Asked Questions about Undeceth-5

What does Undeceth-5 do in products?

It acts as a surfactant to cleanse and an emulsifier to mix oil and water for stable formulas.

Is Undeceth-5 comedogenic?

It has a comedogenic rating of 0, meaning low likelihood of pore clogging.

How safe is Undeceth-5 for skin?

Safety evaluations indicate low concern for irritation at cosmetic levels.