Ingredient Dictionary

CYCLOPENTANONE

Cyclopentanone is a cyclic ketone that consists of cyclopentane bearing a single oxo substituent.

Definition

Cyclopentanone is a cyclic ketone that consists of cyclopentane bearing a single oxo substituent. It has a role as a Maillard reaction product.

Source: PubChem

US FDA substance register · UNII 220W81TN3S · registered name Cyclopentanone · 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

CYCLOPENTANONEINCI

CAS No.chemical registry number: 120-92-3
EC No.EU chemical inventory number: 204-435-9
DTXSIDUS EPA chemical ID: DTXSID3029154
DTXCIDUS EPA compound ID: DTXCID209154

IUPAC: Cyclopentanone
Molecular formula: C5H8O
Molecular weight: 84.118 g/mol

Measured properties

Appearance: Cyclopentanone appears as a clear colorless liquid with a petroleum-like odor. Flash point 87 °F. Less dense than water and insoluble in water. Vapors heavier than air. · CBI, Liquid
Odour: DISTINCTIVE ETHEREAL ODOR, SOMEWHAT LIKE PEPPERMINT
Boiling point: 267.17 °F at 760 mmHg (NTP, 1992) · 130.6 °C AT 760 MM HG
Melting point: -60.3 °F (NTP, 1992) · -51.3 °C
Solubility: Sol in alcohol, acetone, ether · Estimated water solubility of 9175 mg/l
Density: 0.94869 at 68 °F (NTP, 1992) - Less dense than water, will float · 0.94869 @ 20 °C/4 °C
Colour: colourless
Melting/freezing point: -51 ℃
Initial boiling point and range: 131 ℃
Flash point: 26 ℃(c.c.)
Upper/lower flammability or explosive limits: 1.7 / - %
Vapour pressure: 11.4 ㎜Hg (25℃)
Vapour density: 2.3
Relative density: 0.9487
n-Octanol/water partition coefficient (Kow): 0.38
Molecular weight: 84.12

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 7 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.

Solvent2
Fragrance2
Flavouring and nutrient2
Intermediate1

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

8 skin studies and 5 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 13 studies

Not classified
Skin Irritation · Screening
Classification not possible
Skin Sensitization · Screening
Category 6.3A (Category 2)
Skin Irritation · Read Across
Moderate or Mild Irritation
skin irritation: in vivo · Screening · OECD Guideline 404 (Acute Dermal Irritation / Corrosion) according to
Skin Irrit. 2
Skin Irritation · Authoritative
Moderate or Mild Irritation
skin irritation: in vivo · Screening · other guideline: Cosmetic - official method for testing cosmetics ans toiletries (Journal Officiel de la Republique Francaises, 1971 & 1973) according to
Moderate or Mild Irritation
skin irritation: in vivo · Screening · other guideline: AFNOR (1982) according to
Not likely to be sensitizing
skin sensitisation: in vivo (non-LLNA) · Screening · equivalent or similar to OECD Guideline 406 (Skin Sensitisation)
Category 2A
Eye Irritation · Screening
Serious eye damage/eye irritation - Category 2
Eye Irritation · Screening
Category 6.4A (Category 2A)
Eye Irritation · Read Across
Severe Irritation
eye irritation: in vivo · Screening · OECD Guideline 405 (Acute Eye Irritation / Corrosion) equivalent or similar to
Eye Irrit. 2
Eye Irritation · Authoritative