Question 1

What does C11-15 Pareth-7 do in a cosmetic formula?

Accepted Answer

This ingredient is a nonionic surfactant used for cleansing, wetting, solubilizing fragrance or oils, and helping stabilize oil-in-water systems. In rinse-off formulas, it supports detergency and dispersion of oily soils.

Question 2

Is C11-15 Pareth-7 clean?

Accepted Answer

Clean-beauty frameworks often scrutinize it because ethoxylation can leave trace 1,4-dioxane and residual ethylene oxide unless purification and testing are controlled. It is generally low-sensitizing, but like many surfactants, it can contribute to dryness or irritation at higher use levels.

Question 3

Is C11-15 Pareth-7 sustainable?

Accepted Answer

This material is typically made from synthetic fatty-alcohol feedstocks and petrochemical ethoxylation, so its sourcing is only partly aligned with renewable-material preferences. The broader surfactant class is generally biodegradable under aerobic wastewater conditions, but aquatic loading and manufacturing residues remain relevant considerations.

Question 4

Is C11-15 Pareth-7 COSMOS-approved?

Accepted Answer

This ingredient is not permitted under COSMOS-natural or COSMOS-organic because it is an ethoxylated synthetic surfactant. Its Green Chemistry fit is limited by petrochemical processing and potential trace by-products, even though its functional efficiency can reduce the amount needed in a formula.

Question 5

How does C11-15 Pareth-7 work chemically?

Accepted Answer

The molecule is a mixture of mid-chain fatty-alcohol hydrophobes carrying an average of about seven oxyethylene units, which gives it nonionic amphiphilic behavior and moderate oil-water bridging capacity. It is typically used around 0.5% to 5% in personal-care systems, is broadly stable across common cosmetic pH ranges, and is compatible with many anionic and amphoteric surfactants.