Undecane
Hydrocarbon with 11 carbons, a volatile emollient. Paired with Tridecane it forms the Cetiol Ultimate emollient system (BASF). Provides a light skin feel and good compatibility with UV filters. Used in sunscreen sprays and lightweight textures.
Supporting ingredient
It gives a product its texture, stability or shelf life. It has no claimed effect on the skin, so an efficacy tier does not apply. What is known about its safety is below
Tolerability and safety
- Irritation potential
- Low
- Allergen risk
- Low
- Pregnancy
- Safe
- Suitable for
- Normal, Combination, Oily
- Use with caution
- Sensitive
About this ingredient
Undecane is a linear hydrocarbon with 11 carbon atoms. Made synthetically from plant feedstock. A light volatile emollient that pairs with tridecane to form the Cetiol Ultimate system (BASF). Mechanism. Fills intercorneocyte spaces, smooths skin, evaporates within 5-15 minutes (faster than tridecane). Leaves no greasy film. Dissolves UV filters and silicones well. An alternative to cyclopentasiloxane (D5) after the 2018 EU restrictions. Where applied. Sunscreens (especially sprays and light lotions), primers, lightweight serums. In Spain – in Heliocare Color Spray, Isdin Fotoultra Spray, La Roche-Posay Anthelios Invisible Spray. Use levels: 1-15%. Evidence base. Functional ingredient. BASF documentation shows improved sunscreen spread and lower stickiness. Doesn't treat the skin but enhances the formula's feel. Safety. CIR confirmed the safety of the whole C7-C16 alkane group in 2018. Non-sensitising, non-comedogenic (rating 0). Pregnancy and lactation – safe. Usable in sunscreens and creams without restrictions.
Frequently asked questions
Is Undecane safe during pregnancy?
Undecane is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What skin types is Undecane for?
Undecane suits: normal, combination, oily. Use with caution in: sensitive.
What is Undecane and what does it do in cosmetics?
Hydrocarbon with 11 carbons, a volatile emollient.
Is Undecane comedogenic?
On the Fulton scale 0/5 – non-comedogenic. For acne-prone skin, a rating of 3 or higher suggests choosing an alternative.
What's the INCI name for Undecane?
The INCI name is Undecane. It may also appear as: n-Undecane, C11 isoalkane.
See Undecane in a product composition right on the store page
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Similar role in the formula
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