What it is
Buteth-3 is the ethoxylated derivative of butanol, with an average of three ethylene oxide units. The number 3 indicates that degree of ethoxylation, which determines its solubility and surfactant character. In formulations it helps blend oil and water phases and can contribute to cleansing and wetting.
Safety & warnings
Ethoxylated surfactants of this class are generally well tolerated in rinse-off and leave-on cosmetics at typical use levels. Very high concentrations of surfactants can be mildly irritating to some skin.
Origin & sourcing
Synthetic; produced by reacting butyl alcohol with ethylene oxide.
Questions everyone asks
What does the 3 in Buteth-3 mean?
It indicates the average number of ethylene oxide units added to butyl alcohol, which sets the ingredient's solubility and surfactant behavior.
What is Buteth-3 used for?
It works as a surfactant and emulsifier, helping oil and water components mix into a stable product.