Butyl octadecanoate is a fatty acid ester that is the butyl ester of stearic acid.
How much products actually contain
No product states its amount yet.
Of the products containing it, 7 list it before the 1% line and 0 after it (usually 1% or less).
Products using this ingredient
7 of 7 confirmed · likeliest to carry enough first
ORLYORLY 2oz Spritz Dry
ORLYORLY SPRITZ DRY
ORLYORLY Harry Potter™ BUTTERBEER™ Quick Dry Nail Spray
wet n wildwet n wild Color Icon Lipliner | Fab Fuchsia
UOMA BeautyUOMA Beauty Double Take Contour Freed
ORLYORLY ORLY PRO Exfoliator for Hands & Feet 1gal
ORLYORLY ORLY PRO Exfoliator for Hands & Feet 26.5oz
Definition
Butyl octadecanoate is a fatty acid ester that is the butyl ester of stearic acid. It has a role as an algal metabolite. It is functionally related to an octadecanoic acid.
Source: PubChem
US FDA substance register · UNII 6Y0AI5605C · registered name Butyl Stearate · single chemical substance
Cosmetic roles
Safety & regulatory references
Not classified under Korea’s toxic-substance GHS list · existing chemical substance
Other restriction: ban substances that deplete the ozone layer
Source: EU CosIng ingredient list
Reviewed by CIR: Annual Review of Cosmetic Ingredient Safety Assessments - 2002/2003
Reviewed by CIR: Final Report on the Safety Assessment of Butyl Stearate, Cetyl Stearate, Isobutyl Stearate, Isocetyl Stearate, Isopropyl Stearate, Myristyl Stearate, and Octyl Stearate
Reviewed by CIR: Safety Assessment of Alkyl Esters as Used in Cosmetics
More data — names, identifiers, properties, test records, literature
Official labels & definitions
JCIA labelling name ステアリン酸ブチル: 本品は、ステアリン酸（＊）とブタノール（＊）のエステルであり、次の化学式で表される。
Source: JCIA labelling names (Japan)
Names & identifiers
- CAS No.chemical registry number
- 123-95-5
- EC No.EU chemical inventory number
- 204-666-5
- DTXSIDUS EPA chemical ID
- DTXSID5027013
- DTXCIDUS EPA compound ID
- DTXCID207013
- IUPAC
- Butyl octadecanoate
- Molecular formula
- C22H44O2
- Molecular weight
- 340.592 g/mol
Measured properties
- Appearance
- Wet Solid, Liquid · Colorless liquid, m[ = 19.5-20 deg C, [Hawley] Solid or colorless or very pale liquid (above 20 deg C), mp = 27 deg C, [HSDB] Odorless oily liquid, mp approximately 23 deg C, [MSDSonline]
- Odour
- ODORLESS OR FAINTLY FATTY ODOR · FATTY FRUITY ODOR
- Boiling point
- 343 °C · 343.00 °C. @ 25.00 mm Hg
- Melting point
- 27 °C · 27.5 °C
- Solubility
- Insoluble in water, soluble in ethanol, very soluble in acetone · SOL IN MINERAL OR VEGETABLE OILS
- Density
- 0.854 @ 25 °C/4 °C · 0.855-0.875
- Stability
- STABLE LIQUID
- Melting/freezing point
- 27 ℃
- Initial boiling point and range
- 343 ℃
- Flash point
- 160 ℃(c.c.)
- Vapour pressure
- 0.0000058 ㎜Hg (@ 25 ℃, est.)
- Water solubility
- 1700 ㎎/ℓ (@ 25 ℃)
- Vapour density
- 11.4
- Relative density
- 0.854 (@ 25 ℃)
- n-Octanol/water partition coefficient (Kow)
- 9.70 (est.)
- Auto-ignition temperature
- 355 ℃
- Molecular weight
- 340.66
Values measured on the substance itself. The KOSHA data are a reference for writing and reviewing safety data sheets, not a specification for a commercial raw material.
Source: PubChem · KOSHA safety data sheets (Korea)
What products actually use it for
What the 40 products reported to the US EPA with this ingredient use it for. Products outside cosmetics are included, so the top few rows are its main uses.
- Lubricating agent8
- Processing aids not otherwise specified6
- Plasticizer5
- Softener and conditioner5
- Fragrance3
- Flavouring and nutrient3
- Anti-adhesive/cohesive3
- Deodorizer2
4 other uses
- Surfactant (surface active agent)2
- Heat stabilizer1
- Defoamer1
- Surface modifier1
Source: US EPA CompTox dashboard
Related literature
- Characterization of Vermillion and Lipstick Using Thin-Layer Chromatography and Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy With Chemometrics · 2025
- UJI EFEK KOMEDOGENIK PRODUK KOSMETIK BB CREAM PADA TELINGA KELINCI · 2022
- Enzymatic esterification for the synthesis of butyl stearate and ethyl stearate · 2018
- Comedogenicity in Rabbit: Some Cosmetic Ingredients/Vehicles · 2007
- 4 Final Report on the Safety Assessment of Butyl Stearate, Cetyl Stearate, Isobutyl Stearate, Isocetyl Stearate, Isopropyl Stearate, Myristyl Stearate, and Octyl Stearate · 1985
Linked databases 20
- Australian Industrial Chemicals Inventory (AICIS)
- ChEBI
- China inventory of existing ingredients (IECIC)
- EU CosIng ingredient list 2
- JCIA labelling names (Japan)
- Korea Cosmetic Association ingredient dictionary
- Korea toxic substances GHS register (NIER)
- KOSHA safety data sheets (Korea)
- MFDS (Korea) cosmetic ingredient register 2
- NIST Chemistry WebBook
- PubChem 2
- Tlooto literature search 2 3 4 5
- UniChem cross-reference IDs
- US Cosmetic Ingredient Review (CIR) 2 3 4
- US EPA CompTox dashboard 2
- US EPA DSSTox chemical database
- US FDA substance registration (GSRS)
- US FDA Unique Ingredient Identifier (UNII)
- Wikidata
- Wikipedia · Chinese