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Polydimethylsiloxane (PDMS)

  • Silicones
  • CAS 63148-62-9

Polydimethylsiloxane (PDMS) (CAS 63148-62-9) appears in 7 of the 1,812 car-care products CarCareTruth tracks (as of June 2026).

Extremely low acute toxicity — widely used in cosmetics, medical devices, food contact. Practical home use poses minimal risk.

Polydimethylsiloxane (PDMS) is the workhorse linear silicone fluid behind glossy tire dressings and silicone-rich trim restorers. It is inert, non-volatile (in higher molecular weight grades), and considered safe for typical consumer contact.

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: Linear silicone fluid; the primary film-forming ingredient in most silicone-based tire dressings, trim restorers, and many sealants/waxes

Common questions about Polydimethylsiloxane (PDMS)

What is Polydimethylsiloxane (PDMS) used for in car care?
Linear silicone fluid; the primary film-forming ingredient in most silicone-based tire dressings, trim restorers, and many sealants/waxes
Is Polydimethylsiloxane (PDMS) a VOC?
No. Polydimethylsiloxane (PDMS) is not classified as a volatile organic compound (VOC).
Is Polydimethylsiloxane (PDMS) on California's Proposition 65 list?
No. Polydimethylsiloxane (PDMS) is not on California's Proposition 65 list.

7 products 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.