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Polytrimethylhydrosilylsiloxane

  • Silicones
  • CAS 68988-56-7
  • IUPAC: Trimethylsiloxy-terminated hydromethylsiloxane polymer

Polytrimethylhydrosilylsiloxane (CAS 68988-56-7) appears in 3 of the 1,812 car-care products CarCareTruth tracks (as of June 2026).

No GHS health classification. Silicone polymer; low acute toxicity.

Polytrimethylhydrosilylsiloxane is a reactive silicone polymer (CAS 68988-56-7) used in coating and surface modifier formulations. The trimethylsiloxy end groups and hydromethylsiloxane backbone provide crosslinking functionality and surface hydrophobicity. Used at low concentrations in ceramic and graphene spray coating formulations. No GHS health hazard classification at consumer 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
no
Ozone depleting
no
Microplastic
no
PFAS
no
Env. score
4/5
Purpose: Reactive silicone polymer used as a surface modifier and crosslinker in coating formulations; imparts hydrophobicity and film durability

Common questions about Polytrimethylhydrosilylsiloxane

What is Polytrimethylhydrosilylsiloxane used for in car care?
Reactive silicone polymer used as a surface modifier and crosslinker in coating formulations; imparts hydrophobicity and film durability
Is Polytrimethylhydrosilylsiloxane a VOC?
No. Polytrimethylhydrosilylsiloxane is not classified as a volatile organic compound (VOC).
Is Polytrimethylhydrosilylsiloxane on California's Proposition 65 list?
No. Polytrimethylhydrosilylsiloxane is not on California's Proposition 65 list.

3 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.