Ingredient Dictionary

CROTONIC ACID

Crotonic acid is a but-2-enoic acid with a trans- double bond at C-2.

Definition

Crotonic acid is a but-2-enoic acid with a trans- double bond at C-2. It has been isolated from Daucus carota. It has a role as a plant metabolite. It is a conjugate acid of a crotonate.

Source: PubChem

US FDA substance register · UNII YW5WZZ4O5Q · registered name Crotonic acid · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

Cosmetic roles

Protects colour and scent from lightLIGHT STABILIZERListed as a fragrance-composition material (not a claim that it adds scent)FRAGRANCE

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

CROTONIC ACIDINCI크로토닉애씨드Korean label name (MFDS standard)2-Butenoic acidSynonym

CAS No.chemical registry number: 3724-65-0
EC No.EU chemical inventory number: 223-077-4
DTXSIDUS EPA chemical ID: DTXSID7027544
DTXCIDUS EPA compound ID: DTXCID507544

IUPAC: But-2-enoic acid
Molecular formula: C4H6O2
Molecular weight: 86.09 g/mol

Measured properties

Appearance: solid
Melting/freezing point: 72 ℃
Initial boiling point and range: 189 ℃
Flash point: 88 ℃
Upper/lower flammability or explosive limits: 15.1 / 2.2 %
Vapour pressure: 19 ㎩ (at 20 ℃)
Water solubility: 9.4 g/100㎖ (at 25 ℃, in water)
Vapour density: 2.97
Relative density: 1.02
n-Octanol/water partition coefficient (Kow): 0.72
Auto-ignition temperature: 396 ℃
Molecular weight: 86.09

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: 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.

Binder6
Processing aids not otherwise specified3
Flavouring and nutrient2
Stabilizing agent1
Monomers1
Fragrance1
Deodorizer1

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

3 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 5 studies

Category 2
Skin Irritation · Screening
Classification not possible
Skin Sensitization · Screening
Category 6.3A (Category 2)
Skin Irritation · Read Across
Category 2A
Eye Irritation · Screening
Category 6.4A (Category 2A)
Eye Irritation · Read Across