Ingredient Dictionary

2-METHYLNAPHTHALENE

2-methylnaphthalene is a methylnaphthalene carrying a methyl substituent at position 2.

Definition

2-methylnaphthalene is a methylnaphthalene carrying a methyl substituent at position 2.

Source: PubChem

US FDA substance register · UNII S8MCX3C16H · registered name 2-METHYLNAPHTHALENE · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

Cosmetic roles

Gives the product a scentPERFUMING

Safety & regulatory references

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

Source: Korea toxic substances GHS register (NIER)

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

Names & identifiers

2-METHYLNAPHTHALENEINCINaphthalene, 2-methyl-Synonym

CAS No.chemical registry number: 91-57-6
EC No.EU chemical inventory number: 202-078-3
DTXSIDUS EPA chemical ID: DTXSID4020878
DTXCIDUS EPA compound ID: DTXCID60878

IUPAC: 2-Methylnaphthalene
Molecular formula: C11H10
Molecular weight: 142.201 g/mol

Measured properties

Appearance: 2-methylnaphthalene is a white crystalline solid. (NTP, 1992) · Liquid
Boiling point: 466 to 468 °F at 760 mmHg (NTP, 1992) · 241.1 °C
Melting point: 94.3 °F (NTP, 1992) · 34.6 °C
Solubility: less than 1 mg/mL at 70 °F (NTP, 1992) · In water, 24.6 mg/L at 25 °C
Density: 1.0058 at 68 °F (NTP, 1992) - Denser than water, will sink · 1.0058 at 20 °C/4 °C
Colour: white
Odour threshold: 0.02 ppm
Melting/freezing point: 32~35 ℃
Initial boiling point and range: 241 ℃
Flash point: 98 ℃
Upper/lower flammability or explosive limits: 5.3 / 0.8 %
Vapour pressure: 0.03 ㎜Hg (25℃)
Water solubility: 30 ㎎/ℓ
Vapour density: 1
Relative density: 1.0058 (20℃)
n-Octanol/water partition coefficient (Kow): 3.86
Auto-ignition temperature: 488 ℃
Viscosity: 1.05 cP (40℃)
Molecular weight: 142.2

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 10 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.

Fragrance5
Fuel agents2
Intermediate2
Flavouring and nutrient1

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

4 skin studies and 1 eye studies are on record.

Classed as moderate1Classed as low1

The studies disagree (the most common conclusion covers 50%), so they do not establish that this ingredient is irritating. These tests are on the raw material itself; irritation at the amount in a finished product is a different question.

See all 5 studies

Skin corrosion/irritation - Category 2
Skin Irritation · Screening
Not classified
Skin Irritation · Screening
Classification not possible
Skin Sensitization · Screening
SkinSens1
Skin Sensitization · QSAR Predicted
Category 2
Eye Irritation · Screening