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Silanol Terminated Polydimethylsiloxane

  • Silicones
  • CAS 70131-67-8
  • IUPAC: α,ω-Dihydroxypoly(dimethylsiloxane)

No GHS hazard classification. Silanol-terminated PDMS is a high-molecular-weight silicone polymer with no known acute or chronic health effects at use concentrations in car care products.

Silanol terminated polydimethylsiloxane is a linear silicone polymer with hydroxyl (silanol) end groups. The end groups allow it to bond more readily to surfaces compared to standard non-reactive PDMS. Used as a surface modifier in quick detailers and spray waxes to provide lubricity, gloss, and light water beading without leaving a greasy film. The compound is not biodegradable (silicone persistence in environment) but has no aquatic toxicity classification and no known health hazards at detailing product concentrations.

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
Purpose: Reactive linear silicone polymer — surface modifier that deposits a smooth, slick film on paint and glass; contributes to lubricity and water beading

No products on file contain this (yet)

Health summaries are editorial — we synthesize from SDSs, peer-reviewed sources, and regulatory listings. Not medical advice.