Sodium Silicates (Excluding Sodium Metasilicate)

Waterglass and related sodium silicate solutions — the dominant products in this heading — are versatile industrial binders and adhesives used in foundry sand bonding, corrugated board adhesives, cement hardening, and fire-resistant coatings. Canada is the leading US import source, followed by Brazil and Poland, reflecting proximity and established chemical trade relationships. All imports enter under tariff line 2839190000, and the SiO₂:Na₂O ratio (modulus) is the key commercial specification distinguishing liquid waterglass grades from solid or powder forms. The Netherlands and India round out the top five supplier countries.