How We Test the Heat Resistance of Printed Glass Cups for Dishwasher Durabili

How We Test the Heat Resistance of Printed Glass Cups for Dishwasher Durability

One of the most common questions from our customers is whether printed glass cups can maintain their appearance after repeated dishwasher cycles.

Regardless of whether the design is applied through high-temperature or low-temperature printing processes, both methods can pass our internal dishwasher testing of more than 20 cycles without obvious design damage.

However, glassware decorated through high-temperature firing (above 560°C) generally provides better durability compared with low-temperature printing around 180°C. The challenge is that high-temperature firing may cause thermal deformation when applied to thin-wall glass cups.

To ensure stable mass production, we have conducted repeated tests on different glass thicknesses and firing temperatures to evaluate thermal deformation resistance and identify the optimal production conditions.

In this test, a glass cup sample was placed in an electric kiln at 605°C. The temperature was increased gradually over 30 minutes, maintained at 605°C for 15 minutes, and then naturally cooled after the kiln was switched off.

After the test, deformation was observed around the rim area, indicating that 605°C was too high for this specific thin-wall glass structure.

We will continue testing at 580°C and 590°C to find the ideal balance between printing durability, color performance and glass stability. Our goal is to provide customers with printed glass cups that combine attractive designs with reliable quality for large-scale production.