Optical and specialty glass manufacturing is a leading end use, as potassium carbonate improves glass clarity and refractive index compared to soda ash. It is also used in the production of potassium silicate, as a flux in welding, in specialty fertilizer blends for chloride-sensitive crops, and as a food-grade leavening agent in certain baked goods and confections. The niche nature of these applications means import volumes are relatively modest but specification-sensitive.

Yes. Anhydrous potassium carbonate and the hydrated form (potassium carbonate sesquihydrate) differ in active content per unit weight, which affects both pricing on a dry-weight basis and, potentially, the applicable HTS tariff line. Importers should confirm the form and moisture content in the certificate of analysis and ensure the commercial invoice reflects the correct specification to avoid valuation disputes.