In the US and EU, safety is paramount. Our 3.3 Borosilicate glass contains 13% boron trioxide, allowing it to withstand thermal shocks up to 170℃. It is lead-free, non-toxic, and chemically stable, ensuring no harmful substances are released even under high-temperature brewing.

For boutique tea houses and high-end gift brands, we recommend hand-blown glassware. Unlike machine-made products with visible mold lines, hand-blown pieces are lighter, clearer, and offer a seamless finish that justifies a premium retail price for your brand.

Spontaneous breakage months after purchase is usually caused by residual internal stress. Every piece at Guan International undergoes a rigorous annealing process in a temperature-controlled oven to eliminate stress, ensuring long-term structural integrity and reducing your after-sales headache.

We understand the challenges of Amazon startups and boutique tea brands. That’s why we offer flexible MOQs and professional customization services, including silk-screen printing and laser engraving. We are committed to supporting your growth from the first sample to full-scale production.

International shipping can be brutal on glassware. We use drop-test certified packaging, including high-density EPE foam and reinforced 5-ply cartons. For LCL shipments, we provide palletization to ensure your goods arrive in pristine condition, ready for immediate sale.