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Ingredient Dictionary

OLEIC ACID

Oleic acid is an octadec-9-enoic acid in which the double bond at C-9 has Z (cis) stereochemistry.

Molecular structure

How much products actually contain

1 products state the amountmedian 0.000015%

  • under 0.01% 1
  • 0.01–0.1% 0
  • 0.1–1% 0
  • 1% or more 0

Amounts are mostly stated by products named after the ingredient, so they may lean towards token amounts.

Of the products containing it, 105 list it before the 1% line and 190 after it (usually 1% or less).

Products using this ingredient

12 of 295 confirmed · likeliest to carry enough first · See all 295

Definition

Oleic acid is an octadec-9-enoic acid in which the double bond at C-9 has Z (cis) stereochemistry. It has a role as an antioxidant, a solvent, a mouse metabolite, a plant metabolite, an Escherichia coli metabolite, an EC 3.1.1.1 (carboxylesterase) inhibitor and a Daphnia galeata metabolite. It is a conjugate acid of an oleate. It derives from a hydride of a cis-octadec-9-ene.

Source: PubChem

US FDA substance register · UNII 2UMI9U37CP · registered name Oleic acid · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

Cosmetic roles

Makes skin soft and smoothSKIN CONDITIONING - EMOLLIENTMixes and holds oil and water togetherSURFACTANT - EMULSIFYING

Safety & regulatory references

Not classified under Korea’s toxic-substance GHS list · existing chemical substance

Source: Korea toxic substances GHS register (NIER)

Reviewed by CIR: Annual Review of Cosmetic Ingredient Safety Assessments - 2004/2005

Source: US Cosmetic Ingredient Review (CIR)

Reviewed by CIR: Final Report: Safety Assessment of Fatty Acids and Fatty Acid Salts as Used in Cosmetics

Source: US Cosmetic Ingredient Review (CIR)

Reviewed by CIR: Final Report on the Safety Assessment of Oleic Acid, Lauric Acid, Palmitic Acid, Myristic Acid, and Stearic Acid

Source: US Cosmetic Ingredient Review (CIR)

More data — names, identifiers, properties, test records, literature

Official labels & definitions

JCIA labelling name オレイン酸: 本品は、次の化学式で表される不飽和脂肪酸である。

Source: JCIA labelling names (Japan)

JCIA labelling name オレイン酸（トリエチレングリコール／ＰＧ）: 本品は、オレイン酸（＊）とトリエチレングリコール（＊）のモノエステル及びジエステルとプロピレングリコール（ＰＧ（＊））のモノエステル及びジエステルの混合物である。

Source: JCIA labelling names (Japan)

Names & identifiers

OLEIC ACIDINCI올레익애씨드Korean label name (MFDS standard)9-Octadecenoic acid, (Z)-Synonymオレイン酸Japanese labelling name
CAS No.chemical registry number
112-80-1
CAS No.chemical registry number
2027-47-6
EC No.EU chemical inventory number
204-007-1
EC No.EU chemical inventory number
217-977-6
DTXSIDUS EPA chemical ID
DTXSID1025809
DTXCIDUS EPA compound ID
DTXCID705809
IUPAC
(9Z)-Octadec-9-enoic acid
Molecular formula
C18H34O2
Molecular weight
282.468 g/mol

Measured properties

Appearance
Oleic acid is a colorless to pale yellow liquid with a mild odor. Floats on water. (USCG, 1999) · Other Solid, CBI, Liquid, Wet Solid
Odour
PECULIAR LARD-LIKE ODOR
Boiling point
547 °F at 100 mmHg (NTP, 1992) · 360 °C
Melting point
61.3 °F (NTP, 1992) · 13.4 °C
Solubility
Insoluble (NTP, 1992) · Practically insol in water, sol in chloroform, ether, fixed & volatile oils, alcohol, benzene
Density
0.89 at 77 °F (USCG, 1999) - Less dense than water, will float · 0.895 at 25 °C/25 °C
Stability
ON EXPOSURE TO AIR, ESPECIALLY WHEN IMPURE, IT OXIDIZES & ACQUIRES YELLOW TO BROWN COLOR & RANCID ODOR
Viscosity
25.6 cP at 30 °C · 25.6 cP (@ 30 ℃)
Dissociation constant
pKa = 5.02 in aqueous solution at 25 °C
Colour
colourless
Melting/freezing point
13.4 ℃
Initial boiling point and range
300 ℃
Flash point
189 ℃(c.c.)
Flammability (solid, gas)
combustible
Vapour pressure
0.000000546 ㎜Hg (@ 25 ℃)
Water solubility
0.012 ㎎/ℓ (@ 25 ℃, est.)
Vapour density
9.75
Relative density
0.89
n-Octanol/water partition coefficient (Kow)
7.73 (est.)
Auto-ignition temperature
363 ℃
Molecular weight
282.52

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 157 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.

  • Dispersing agent27
  • pH regulating agent23
  • Emulsifier19
  • Surfactant (surface active agent)13
  • Lubricating agent12
  • Processing aids not otherwise specified7
  • Softener and conditioner5
  • Solubility enhancer5
22 other uses
  • Defoamer5
  • Flavouring and nutrient4
  • Solvent4
  • Intermediate3
  • Fragrance3
  • Cleaning agent3
  • Binder3
  • Corrosion inhibitor2
  • Soil amendments2
  • Anti-adhesive/cohesive2
  • Surface modifier2
  • Fuel agents2
  • Pigment2
  • No specific technical function1
  • Hydraulic fluids1
  • Fuel1
  • Foamant1
  • Flotation agent1
  • Abrasive1
  • Plasticizer1
  • Diluent1
  • Monomers1

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

1 skin studies and 1 eye studies are on record.

Classed as moderate2

The study conclusions largely agree (100%). These tests are on the raw material itself; irritation at the amount in a finished product is a different question.

See all 2 studies
  • Category 6.3A (Category 2)
    Skin Irritation · Read Across
  • Category 6.4A (Category 2A)
    Eye Irritation · Read Across

Source: US EPA CompTox dashboard

Related literature

Linked databases 21

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