The ratio itself does not create a separate tariff line within this SITC heading, but it is commercially significant because different ratios (e.g., 2.0, 2.5, or 3.3 modulus) are specified for distinct end uses such as detergents versus foundry binders. Importers should document the grade and concentration on the commercial invoice to support accurate classification and avoid disputes at entry.

The largest consuming sectors are detergent and soap manufacturing (where sodium silicate acts as a builder and corrosion inhibitor), paper and board production (as a sizing and coating agent), and construction chemicals (concrete sealers and refractory cements). Foundry and investment-casting operations also rely on silicate binders for mold-making.