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Methyl Hydrogen Siloxane (Siloxanes and Silicones, Me Hydrogen)

  • Silicones
  • CAS 63148-57-2
  • IUPAC: Hydrogen-terminated polymethylhydrosiloxane

Methyl Hydrogen Siloxane (Siloxanes and Silicones, Me Hydrogen) (CAS 63148-57-2) appears in 1 of the 1,812 car-care products CarCareTruth tracks (as of June 2026).

Not classified for health hazards per GHS. No H-codes at ingredient or mixture level in SDS §3. Reactive Si-H groups provide crosslinking chemistry; no acute or chronic health classification confirmed.

Methyl hydrogen siloxane is a polymethylhydrosiloxane used as a crosslinker in silicone-based ceramic coating formulations. The Si-H groups react with aminosiloxane and other reactive silicone components during the cure process to build the coating network. Not classified for health or environmental hazards at the ingredient level in typical ceramic coating SDSs.

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 crosslinker; provides film-forming and hydrophobic surface bonding in ceramic coating formulations

Common questions about Methyl Hydrogen Siloxane (Siloxanes and Silicones, Me Hydrogen)

What is Methyl Hydrogen Siloxane (Siloxanes and Silicones, Me Hydrogen) used for in car care?
Reactive silicone crosslinker; provides film-forming and hydrophobic surface bonding in ceramic coating formulations
Is Methyl Hydrogen Siloxane (Siloxanes and Silicones, Me Hydrogen) a VOC?
No. Methyl Hydrogen Siloxane (Siloxanes and Silicones, Me Hydrogen) is not classified as a volatile organic compound (VOC).
Is Methyl Hydrogen Siloxane (Siloxanes and Silicones, Me Hydrogen) on California's Proposition 65 list?
No. Methyl Hydrogen Siloxane (Siloxanes and Silicones, Me Hydrogen) 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.