Alkyl Polysilicates

Alkyl polysilicates (CAS 919-30-2) are silicon ester crosslinkers used in industrial stone sealers, architectural coatings, and automotive ceramic trim coatings. In Adam's Ceramic Black Trim Restorer, this ingredient at 5–10% functions as the curing crosslinker — it reacts with the polysilazane binder and the D5 carrier to form a hard, bonded ceramic film on the trim surface. **Hazard — the driver of the DANGER rating:** Alkyl polysilicates are corrosive chemicals (H314 skin corrosion Cat 1B). At the ingredient level, even small concentrations in a formulated product are sufficient to trigger DANGER signal word and H318 (serious eye damage Cat 1) at product level. The corrosive mechanism is hydrolysis of the silicate ester groups — in the presence of moisture (including skin moisture), the product releases silicic acid and alcohols that cause alkaline chemical burns on contact. This is not boilerplate — it is the same class of chemistry that triggers skin corrosion H-codes in industrial masonry sealers. Products containing this ingredient at ≥5% require nitrile gloves and chemical splash goggles for every application. **Aquatic profile:** Lower aquatic concern than the D5 carrier in the same product — fish LC50 >934 mg/L, invertebrate EC50 331 mg/L. No PBT or vPvB designation.