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Polysilazane

  • Ceramic (SiO₂)
  • CAS 90387-00-1
  • IUPAC: Dimethyl, methyl aminoethylaminoisobutyl siloxane, methoxy & hydroxy terminated (crosslinker component)

Polysilazane (CAS 90387-00-1) appears in 2 of the 1,812 car-care products CarCareTruth tracks (as of June 2026).

Ingredient-level: H314 (skin corrosion Cat 1B) and H318 (serious eye damage Cat 1). At 1–5% in consumer ceramic coating formulas, the mixture-level SDS §2 classification is reduced to H315 (skin irritation Cat 2) and H319 (eye irritation Cat 2) — below the corrosion thresholds. Handle with caution; the ingredient-level corrosion hazard does not propagate to the diluted consumer mixture.

Polysilazane (CAS 90387-00-1) is a silicon-nitrogen polymer used as a hardness-providing crosslinker in consumer ceramic coatings, including Optimum Gloss-Coat. On cure, atmospheric moisture converts the Si-N bonds into a Si-O-Si (silica-like) network that contributes film hardness and chemical resistance.

Hazard note: At the ingredient level this compound is classified as a skin corrosive (H314) and serious eye hazard (H318). At 1–5% in consumer coating formulas, the SDS §2 mixture classification drops to the milder irritant tier — H315 (skin irritation Cat 2) and H319 (eye irritation Cat 2). The ingredient-level corrosion classification should not be attributed to the diluted consumer product's §2 classification. See the relevant product SDS §2 for the applicable mixture-level hazard profile.

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: Polysilazane crosslinker; contributes film hardness and durability in cured ceramic coating. Ingredient-level GHS classification: Skin Corr. 1B (H314) and Eye Dam. 1 (H318). At 1–5% concentration in consumer ceramic coating mixtures, the SDS §2 mixture-level classification drops to H315/H319 Cat 2 (mild irritant) — the corrosion thresholds are not met at diluted concentrations.

Common questions about Polysilazane

What is Polysilazane used for in car care?
Polysilazane crosslinker; contributes film hardness and durability in cured ceramic coating. Ingredient-level GHS classification: Skin Corr. 1B (H314) and Eye Dam. 1 (H318). At 1–5% concentration in consumer ceramic coating mixtures, the SDS §2 mixture-level classification drops to H315/H319 Cat 2 (mild irritant) — the corrosion thresholds are not met at diluted concentrations.
Is Polysilazane a VOC?
No. Polysilazane is not classified as a volatile organic compound (VOC).
Is Polysilazane on California's Proposition 65 list?
No. Polysilazane is not on California's Proposition 65 list.

2 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.