Glass-ceramic articles occupy a distinct material classification from conventional soda-lime or borosilicate glass, owing to their crystalline microstructure that delivers superior thermal shock resistance — a property that drives demand in cookware, bakeware, and specialty industrial applications. The controlled crystallization process used in manufacturing places these goods in a separate tariff category from ordinary glassware, which can affect duty treatment and classification decisions at entry. Importers should verify that the glass-ceramic composition is properly documented, as misclassification into adjacent household glassware headings is a common audit finding.

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