Is the Double Glass Water Cup Insulated?

Strictly speaking, the double-layer glass water cup is not insulated.

Due to the double layer, the relative heat conduction will become slower, but due to material limitations, vacuuming technology cannot be used between the double glasses, so the double glasses cannot achieve the effect of heat preservation.

Considering the environment temperature, the double-layer glass will take about 1-3 hours from hot water at 96°C to 35°C. The international standard for thermos is that it takes at least 6 hours for hot water at 96℃ to reach 55℃. Therefore, many e-commerce platforms or merchants mislead consumers as long as they mark the double-layer glass vacuum flask.

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