The journey begins with sourcing high borosilicate glass, a specialized composition containing boron trioxide. This additive grants the glass a low thermal expansion coefficient, enabling it to withstand extreme temperature shifts without cracking—a critical feature for glass cups designed to hold hot or icy beverages. Manufacturers rigorously test raw materials to ensure purity, as even minor impurities can compromise structural integrity.
The glass mixture is melted in furnaces at temperatures exceeding 1,600°C, transforming into a molten state. Skilled artisans or automated machinery then shape the liquid glass using blow-pipe techniques or molds. For double walled glass cups, this step involves creating two concentric layers. The inner and outer walls are formed simultaneously, separated by a narrow air gap that provides insulation. This dual-layer structure not only enhances thermal retention but also prevents condensation, keeping hands comfortable and tabletops drip-free.

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