Inorganic zinc silicate paint uses zinc silicate (ethyl silicate hydrolysate or potassium silicate/sodium silicate) as the binder, combined with a high zinc dust content, and is a type of zinc-rich primer with pronounced temperature resistance and solvent resistance. Its advantages are threefold: temperature resistance up to above 400°C (far higher than approximately 120°C for epoxy zinc-rich), resistance to organic solvents and ketone media, and a hard, wear-resistant film that can serve as a primer for subsequent welding and cutting. Typical uses include high-temperature pipelines, storage tank interiors, petrochemical units, and shop primers for steel components requiring welding. In application, particular attention should be paid to: most products rely on moisture in the air to trigger curing, requiring relative humidity control (too low, no curing; too high, easy blistering); high surface preparation grade (usually Sa2.5); the film is relatively brittle, and compatible topcoats with good compatibility and no dependence on strong solvents should be selected. This page summarizes original manufacturer data for inorganic zinc silicate paints from various brands.
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