Ingredient Dictionary

OCTANE

Octane is a straight chain alkane composed of 8 carbon atoms.

Definition

Octane is a straight chain alkane composed of 8 carbon atoms. It has a role as a xenobiotic.

Source: PubChem

US FDA substance register · UNII X1RV0B2FJV · registered name Octane · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

Cosmetic roles

Base that dissolves other ingredientsSOLVENT

Safety & regulatory references

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

Source: Korea toxic substances GHS register (NIER)

Other restriction: ban substances that deplete the ozone layer

Source: EU CosIng ingredient list

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

Names & identifiers

OCTANEINCI옥탄Korean label name (MFDS standard)

CAS No.chemical registry number: 111-65-9
EC No.EU chemical inventory number: 203-892-1
DTXSIDUS EPA chemical ID: DTXSID0026882
DTXCIDUS EPA compound ID: DTXCID406882

IUPAC: Octane
Molecular formula: C8H18
Molecular weight: 114.232 g/mol

Measured properties

Appearance: N-octane is a colorless liquid with an odor of gasoline. Less dense than water and insoluble in water. Hence floats on water. Produces irritating vapor. · Liquid
Odour: Gasoline-like
Boiling point: 258.1 °F at 760 mmHg (USCG, 1999) · 125.62 °C
Melting point: -70.2 °F (USCG, 1999) · -56.73 °C
Solubility: 7e-05 % at 77 °F (NIOSH, 2024) · In water, 0.66 mg/L at 25 °C
Density: 0.703 at 68 °F (USCG, 1999) - Less dense than water, will float · 0.6986 g/cu cm at 25 °C
Viscosity: 0.5151 cP at 25 °C · 0.5151 (25℃)
Colour: colourless
Melting/freezing point: -56.73 ℃
Initial boiling point and range: 125.62 ℃
Flash point: 13 ℃
Evaporation rate: 1
Upper/lower flammability or explosive limits: 6.5 / 1 %
Vapour pressure: 14.1 ㎜Hg (25℃)
Water solubility: 0.7 ㎎/ℓ (25℃)
Vapour density: 3.86
Relative density: 0.6986
n-Octanol/water partition coefficient (Kow): 5.18
Auto-ignition temperature: 206 ℃
Decomposition temperature: 1302.7 (20℃, kg cal/g mol)
Molecular weight: 114.23

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 15 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.

Solvent4
Intermediate3
Degradant/impurity (EPA)2
Fuel2
Processing aids not otherwise specified2
UV stabilizer1
Cleaning agent1

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

5 skin studies and 2 eye studies are on record.

Classed as moderate1

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 7 studies

Category 2
Skin Irritation · Screening
Skin corrosion/irritation - Category 2
Skin Irritation · Screening
Classification not possible
Skin Sensitization · Screening
Skin Irrit. 2
Skin Irritation · Authoritative
Category 6.3B (Category 3)
Skin Irritation · Read Across
Category 2
Eye Irritation · Screening
Category 6.4A (Category 2A)
Eye Irritation · Read Across