Q: How Does Vacuum Insulated Glass Help Prevent Condensation?

Condensation occurs when water vapour in the air comes into contact with a surface that is below the air's dew point. The vapour then condenses into liquid droplets, creating a fogged appearance.

In traditional insulating glass, the air or gas-filled cavity still allows some heat transfer through conduction and convection. Depending on the operating conditions, the glass surface can become cold enough to fall below the surrounding air's dew point, resulting in condensation.

Vacuum insulated glass works differently. Its evacuated cavity significantly suppresses gas conduction and convection between the panes, reducing heat transfer through the glazing. This helps maintain a more favourable temperature on the exposed glass surface and can reduce the likelihood of condensation when the surface temperature remains above the dew point.

Under the stated test conditions of an ambient temperature of 32°C and relative humidity of 80%, the vacuum glass reportedly remained clear and free of visible fogging. Even when the refrigeration unit operates at −50°C, the glass surface is reported to remain 3–5°C above the dew point, preventing the surface conditions required for condensation.

Actual anti-condensation performance depends on the glazing configuration, indoor and outdoor temperatures, relative humidity, edge conditions and installation details. Product-specific test data should be used to verify performance under the intended operating conditions.