Alcool cétylique — Frequently Asked Questions

Cetyl alcohol gives a lighter, softer body and a quicker break on the skin. Cetostearyl alcohol, a C16–C18 blend, usually builds a more robust gel network and a creamier, more stable texture, which is why many standard emulsions use it. Formulators often choose cetyl alcohol for lotions and light creams and cetostearyl alcohol for thicker creams and conditioners. Because the two are not drop-in replacements, test viscosity and stability when switching.

The gel network that thickens the cream depends on the exact chain distribution. A lot with more C14 or C18 alcohol, or a small amount of residual ester, can change how the network forms and ages, so viscosity may rise or fall over the following weeks. Compare gas chromatography results and melting ranges between lots, and ask for a tighter C16 minimum if your formulation is sensitive to it.

No. Cetyl alcohol is a long-chain fatty alcohol, a waxy solid that softens the skin rather than drying it, and it does not evaporate like ethanol. It is widely used in leave-on products and is generally well tolerated, although occasional contact allergy has been reported. The word alcohol only describes its hydroxyl group. Some ingredient-conscious consumers confuse the two, so label copy sometimes explains the difference.

For most cosmetic creams and conditioners, a grade with 90–95% or more C16 alcohol works well, provided lot-to-lot consistency is good. Pharmaceutical products need material that meets the relevant Ph. Eur. or USP-NF monograph. Industrial uses, such as ester synthesis or lubricants, can often take a technical grade. Specify the minimum C16 content and the melting range rather than a purity word such as pure.

The chemistry is the same. Pastilles are uniform drops that flow and dose well, make less dust and melt evenly, which suits automated weighing. Flakes are thinner and melt quickly but can bridge in hoppers and break into fines. Either form cakes if stored warm or stacked too high. Choose the form that suits your dispensing equipment, and keep it the same for approved production.

Ask for the specification, a certificate of analysis for each lot and the safety data sheet. Cosmetic safety assessors usually also want the INCI name, an origin statement confirming vegetable or synthetic origin, and statements on allergens, CMR substances and animal testing where their market requires them. For pharmaceutical use, ask for confirmation of the monograph and the manufacturing site it covers. For sustainable palm claims, ask for the certificate scope.