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CarCareTruthProducts · Ranked

Methyl Ionone

  • Fragrances
  • CAS 127-42-4
  • IUPAC: 3-methyl-4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-3-buten-2-one

CarCareTruth tracks Methyl Ionone (CAS 127-42-4) as a car-care ingredient.

No health H-codes at typical use concentrations. Some fragrance industry studies identify alpha-isomethyl ionone as a contact allergen; the compound class is monitored under IFRA standards.

Methyl ionone is a member of the ionone family of fragrance compounds, used extensively in perfumery for violet and woody notes. The compound class has low biodegradability and is persistent in aquatic environments; H411 (chronic aquatic toxicity Cat 2) applies. Ionone compounds are monitored under IFRA restrictions due to potential sensitization in some individuals, though methyl ionone itself is not classified as a skin sensitizer (H317) at typical fragrance concentrations. The environmental profile is the primary concern: persistence and aquatic toxicity warrant responsible disposal of products containing this compound.

Health & environment profile

VOC
no
Prop 65 listed
no
Asthmagen
no
EPA Safer Choice
no
Aquatic toxicity
yes
Biodegradable
no
Bioaccumulative
no
Persistent
yes
Ozone depleting
no
Microplastic
no
PFAS
no
Env. score
2/5
Purpose: Fragrance compound with a violet, woody, and powdery note; widely used in fine fragrances and consumer products

Common questions about Methyl Ionone

What is Methyl Ionone used for in car care?
Fragrance compound with a violet, woody, and powdery note; widely used in fine fragrances and consumer products
Is Methyl Ionone a VOC?
No. Methyl Ionone is not classified as a volatile organic compound (VOC).
Is Methyl Ionone on California's Proposition 65 list?
No. Methyl Ionone is not on California's Proposition 65 list.

No products on file contain this (yet)

Related

Health and environment notes translate the manufacturer Safety Data Sheet, the GHS classification, and authoritative regulatory listings (California Prop 65, EPA). Not medical advice. They describe the ingredient itself; whether a hazard applies to a finished product depends on its concentration and how it's used.