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Silsesquioxane (proprietary ceramic-coating agent)

  • Silicones
  • CAS proprietary
  • IUPAC: unknown (trade secret)

Silsesquioxane (proprietary ceramic-coating agent) (CAS proprietary) appears in 1 of the 2,122 car-care products CarCareTruth tracks (as of August 2026).

Trade-secret ingredient disclosed in the manufacturer's CA Cleaning Product Right to Know Act filing by function only ('Coating Agent'), with CAS withheld. The finished-product SDS mixture classification (DANGER, driven by H222 extremely flammable aerosol; Eye Irrit. 2 H319; STOT SE 3 H336) does not attribute any of those hazard codes to this specific component. No CAS number is available for independent toxicological cross-check.

This entry represents a proprietary silsesquioxane-family ceramic-coating agent disclosed in SONAX's California Cleaning Product Right to Know Act filing for PROFILINE Ceramic Coating CC36 (Base Coat) by function only ("Coating Agent"). No CAS number is assigned because the specific chemical identity is withheld by the manufacturer as a trade secret.

Why this entry exists: CarCareTruth's ingredient data model requires that every SDS/right-to-know-disclosed ingredient appear in the structured YAML — including trade-secret ingredients disclosed by function. This stub ensures the ingredient is visible on the product page and in future automated scoring, even when the identity is unknown.

Silsesquioxanes generally: Silsesquioxanes are a class of silicon-oxygen cage or network polymers (general formula RSiO1.5) used across coatings chemistry as film-formers and cross-linkers, prized for hardness, UV stability, and hydrophobic surface properties — the same properties marketed as "ceramic" protection in automotive coatings. They are chemically distinct from fluorinated (PFAS) chemistry.

Regulatory status

  • No CAS number — cannot be evaluated against TSCA, Prop 65, or EU CLP registries
  • Disclosed under the California Cleaning Product Right to Know Act (CA-RTK) as required by law

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
5/5
Purpose: Ceramic film-former — the primary coating/bonding agent that cross-links to form the cured ceramic layer. Trade-secret formulation; specific identity not publicly disclosed by the manufacturer.

Common questions about Silsesquioxane (proprietary ceramic-coating agent)

What is Silsesquioxane (proprietary ceramic-coating agent) used for in car care?
Ceramic film-former — the primary coating/bonding agent that cross-links to form the cured ceramic layer. Trade-secret formulation; specific identity not publicly disclosed by the manufacturer.
Is Silsesquioxane (proprietary ceramic-coating agent) a VOC?
No. Silsesquioxane (proprietary ceramic-coating agent) is not classified as a volatile organic compound (VOC).
Is Silsesquioxane (proprietary ceramic-coating agent) on California's Proposition 65 list?
No. Silsesquioxane (proprietary ceramic-coating agent) 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.