How is the potassium carbonate supply-demand balance shifting in China's glass and agrochemical sectors?

Potassium carbonate demand is being reshaped by two distinct downstream trends. In glass manufacturing, domestic producers are ramping up high-purity anhydrous potassium carbonate capacity—one Jiangsu producer now offers 99.8% purity grades at 50,000 tonnes per year, targeting optical lenses and display panel glass that previously relied on imports. This lowers cost and secures supply for specialty glass makers. Meanwhile, in fertilizers, agricultural-grade potassium carbonate is gaining traction as a potassium source in compound and water-soluble fertilizers, with producers emphasizing cost efficiency over ultra-high purity. The market is bifurcating: premium grades for high-end glass and fine chemicals, and economical grades for bulk agricultural use. This split is intensifying competition among Chinese producers to differentiate product lines while managing input costs.