PEG-40 Sorbitan Perisostearate

What is PEG-40 Sorbitan Perisostearate?

PEG-40 Sorbitan Perisostearate is a synthetic ingredient formed by ethoxylating sorbitan perisostearate—a ester of sorbitol (a sugar alcohol) and perisostearic acid (a branched-chain fatty acid)—with 40 units of ethylene oxide. This process imparts hydrophilic properties to the lipophilic base, creating a molecule with balanced solubility. Primarily used in cosmetic formulations like lotions, creams, shampoos, and makeup removers, it acts as a surfactant by lowering surface tension to facilitate ingredient dispersion and wetting. As an emulsifying agent, it forms a protective film at the oil-water interface, preventing phase separation and ensuring product stability over time. Its mild nature suits both rinse-off and leave-on products, contributing to smooth textures and even distribution without altering skin feel significantly. Regulatory bodies like the Cosmetic Ingredient Review affirm its role in safe cosmetic applications when properly purified.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 4 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

Stabilizes emulsions for consistent lotion and cream textures.

Lowers surface tension to aid gentle cleansing in washes and shampoos.

Promotes uniform blending of oils and water for better product spreadability.

Who It's For

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

Who May Benefit Who Should Avoid
Users of emulsion-based moisturizers seeking stable formulations.
Those with heightened sensitivity to ethoxylated compounds.
Individuals with non-comedogenic needs in daily cleansers.
Individuals avoiding PEG ingredients due to potential impurities.
People preferring mild surfactants in hair and body care products.
Users preferring natural-only skincare routines.

Safety Notes

  • Assessed safe for cosmetic use by expert reviews when formulated appropriately.
  • Low comedogenic potential, unlikely to clog pores.

Frequently Asked Questions about PEG-40 Sorbitan Perisostearate

What is PEG-40 Sorbitan Perisostearate used for?

It serves as a surfactant and emulsifier in creams, lotions, and cleansers to mix oil and water phases stably.

Is it safe for daily skincare?

Expert panels deem it safe in cosmetics when used within guidelines, with low irritation potential.

Does it clog pores?

Rated non-comedogenic, making it suitable for pore-conscious routines.