Potassium Silicate

Potassium silicate is a water-soluble alkaline salt used in heavy-duty cleaners and degreasers as a builder. It provides pH buffering, helps soften water by sequestering metal ions, and acts as a corrosion inhibitor on metal surfaces — particularly aluminum and zinc — by depositing a thin silicate film that retards acid attack. In automotive degreasers it appears at sub-1% concentrations alongside other alkaline builders (sodium metasilicate, tetrapotassium pyrophosphate) and contributes to the formula's grease-cutting capacity without the harshness of stronger caustics like sodium hydroxide. In aquatic systems it dissociates into potassium ions and silicate, neither of which is meaningfully bioaccumulative; the silicate ion is essentially a soluble form of silica and is environmentally benign at trace concentrations.