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Dimethiconol

  • Silicones
  • CAS 70131-67-8
  • IUPAC: Dimethyl silicone terminated with hydroxyl groups

Dimethiconol (CAS 70131-67-8) appears in 1 of the 1,812 car-care products CarCareTruth tracks (as of June 2026).

Biologically inert silicone used widely in personal care and cosmetic products. No known health hazards at use concentrations.

Dimethiconol is the hydroxyl-terminated form of dimethicone (PDMS). The hydroxyl end groups make it more reactive with surfaces than standard dimethicone, allowing it to bond more durably to leather and vinyl rather than sitting on top as a mobile film. Used in leather conditioning sprays as both a conditioner and a mild water-repellent film former.

No health concerns at use concentrations. Environmentally persistent but low aquatic toxicity based on available data.

Health & environment profile

VOC
no
Prop 65 listed
no
Asthmagen
no
EPA Safer Choice
no
Aquatic toxicity
no
Biodegradable
no
Bioaccumulative
no
Persistent
yes
Ozone depleting
no
Microplastic
no
PFAS
no
Env. score
3/5
Purpose: Conditioning agent, water-repellent film former on leather and vinyl

Common questions about Dimethiconol

What is Dimethiconol used for in car care?
Conditioning agent, water-repellent film former on leather and vinyl
Is Dimethiconol a VOC?
No. Dimethiconol is not classified as a volatile organic compound (VOC).
Is Dimethiconol on California's Proposition 65 list?
No. Dimethiconol is not on California's Proposition 65 list.

1 product contain this

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.