"A practical supplier guide to cetyl alcohol (1-hexadecanol, CAS 36653-82-4, C16H34O, MW ~242.44): the saturated C16 fatty alcohol that builds body, stabilizes emulsions, and softens skin feel in creams, conditioners, and pharma bases. Covers the chemistry, typical use levels (1-5%), and natural formulation pairings with squalane, soybean lecithin, mild surfactants, humectants, and brightening/exfoliating actives."
-Deshangchemical-chemechemi
Cetyl Alcohol (1-Hexadecanol, CAS 36653-82-4): The Fatty Alcohol That Gives Creams Their Body and Skin Its Soft Finish
If you have ever rubbed a hand cream and noticed how it spreads smoothly, leaves a soft after-feel, and does not feel greasy five minutes later, a fatty alcohol was doing quiet work. For most formulators that fatty alcohol is cetyl alcohol (1-hexadecanol, CAS 36653-82-4). It is one of the most used structuring agents in personal care, yet it rarely gets the attention given to active ingredients. That is a mistake. Cetyl alcohol is what turns a thin lotion into a stable cream.
What cetyl alcohol actually is
Cetyl alcohol is a saturated, straight-chain C16 fatty alcohol with the molecular formula C16H34O and a molecular weight of about 242.44 g/mol. Commercial material is usually derived from natural fats and oils (palm or coconut origin), then hydrogenated and fractionated into a white, waxy solid that ships as flakes or pastilles. It melts around 49–51 °C, is insoluble in water, and dissolves readily in alcohols, ethers, and most cosmetic oils. Those properties make it ideal for oil-based and emulsion systems where you need structure without added water.
On its own cetyl alcohol is not an emulsifier — that is a common misconception. It is a co-emulsifier and stabilizer. Pair it with a true emulsifier or a surfactant and it locks the formula together, raises viscosity, and gives the finished product a creamy, conditioned texture.
Why formulators keep it on the shortlist
The appeal is practical rather than flashy:
- Emolliency. It lays down a light occlusive film that reduces transepidermal water loss and leaves skin feeling conditioned rather than tight.
- Co-emulsification. In both oil-in-water and water-in-oil systems it improves stability and keeps the phases from separating on the shelf.
- Thickening and body. A small percentage (typically 1–5% in leave-on products) is enough to build the rich, cushiony feel buyers associate with a "real" cream.
- Mildness. It is low-irritation and non-sensitizing at normal use levels, which is why it shows up in products aimed at sensitive skin.
- Compatibility. It tolerates silicones, natural oils, esters, cationic conditioners, and a wide range of actives, so it drops into existing bases without rework.
Where it earns its place
Cetyl alcohol spans far more than face cream:
- Skincare: moisturizers, body lotions, barrier creams, and night creams all use it for structure and a silky after-feel.
- Hair care: conditioners, masks, and leave-in products rely on it to improve combability, softness, and the deposition of conditioning agents along the fiber.
- Color and makeup: lipsticks, foundations, and primers use it for glide, payoff, and consistent wear.
- Pharmaceutical and dermaceutical: it serves as an excipient and ointment base, supporting stable emulsions for topical active ingredients and improving spreadability for patient acceptability.
Pairing it with the rest of the bench
Cetyl alcohol works best as part of a system. In a moisturizer it sits naturally alongside a light emollient oil such as squalane (CAS 111-01-3), which carries actives into the skin without heaviness, and a natural emulsifier like soybean lecithin (CAS 8002-43-5). For the cleansing side, it is often formulated with mild surfactants such as lauryl betaine (CAS 683-10-3), sodium lauroylsarcosinate (CAS 137-16-6), and the newer lauryl hydroxysultaine (CAS 13197-76-7), which keep foam and viscosity stable in hard water.
For humectancy you can build around urea (CAS 57-13-6) and D-trehalose dihydrate (CAS 6138-23-4), both of which pull and hold water in the upper skin layers, while N-acetyl-D-glucosamine (CAS 7512-17-6) adds a moisturizing, barrier-supporting angle. On the active side, cetyl alcohol based creams are a stable home for brighteners like kojic acid (CAS 501-30-4) and alpha-arbutin (CAS 84380-01-8), antioxidants like L-ascorbic acid (CAS 50-81-7), and exfoliants like glycolic acid (CAS 79-14-1). A small amount of ethylhexylglycerin (CAS 70445-33-9) handles preservation support without disturbing the texture.
Handling and buying notes
Because cetyl alcohol is a solid at room temperature, it is added to the oil phase and melted in (around 60–70 °C is typical) before the water phase is brought in. It is stable, has a long shelf life, and tolerates normal warehouse conditions. When sourcing, look for consistent flake size, low odor, and grades that meet the EU Cosmetic Regulation and FDA cosmetic guidelines; vegan and natural-origin grades are widely available for clean-label positioning. Biodegradability is good, which matters as brands move toward sulfate-free and silicone-free systems.
Quick specification snapshot
| Property | Typical value |
|---|---|
| CAS number | 36653-82-4 |
| INCI / common name | Cetyl Alcohol (1-Hexadecanol) |
| Molecular formula | C16H34O |
| Molecular weight | ~242.44 g/mol |
| Appearance | White waxy flakes / pastilles |
| Melting point | 49–51 °C |
| Solubility | Insoluble in water; soluble in alcohols, ethers, cosmetic oils |
| Origin | Natural fats and oils (palm / coconut derived) |
| Typical use level | 1–5% (leave-on) |
Bottom line
Cetyl alcohol will never be the headline on a package, but it is the reason the product feels right. It builds body, stabilizes emulsions, softens the after-feel, and plays well with almost everything else on the bench. For formulators building premium skincare, performance hair care, or stable pharmaceutical creams, 1-hexadecanol (CAS 36653-82-4) belongs in the standard toolkit — and it is worth buying from a supplier who can document grade, origin, and consistency batch to batch.
