What Causes Fogging On The Glass Of Broken Bridge Aluminum Windows ?

Jun 18, 2025

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The main reasons for fogging on the glass of broken bridge aluminum doors and Windows are as follows:

 

1. Poor sealing

 

The sealant between the glass and the window frame ages, cracks or is not installed properly, allowing external moisture to enter the glass interlayer. For instance, during long-term use, sealant gradually loses its elasticity and develops gaps due to factors such as ultraviolet radiation and temperature changes.

 

2. Poor quality or improper installation of the thermal insulation strips in aluminum alloy doors and Windows with broken bridge technology can affect the overall sealing performance, allowing moisture to enter. If the material of the thermal break is not good, it is prone to deformation, thereby damaging the sealing performance of the doors and Windows.

Ii. Glass quality issues

 

The manufacturing process of insulating glass is poor. For instance, the sealant does not completely seal the edge of the glass, or during the manufacturing process, the desiccant inside the glass becomes ineffective and cannot absorb the moisture that enters the interlayer of the glass.

 

2. Glass has poor thermal insulation performance. When the temperature difference between indoors and outdoors is large, the surface temperature of the glass is relatively low, which easily causes water vapor in the air to condense into fog.

 

Third, there is a large temperature difference between indoors and outdoors

 

In winter, the indoor temperature is high and the humidity is large, while the outdoor temperature is low. This significant temperature difference causes the surface temperature of the glass to drop below the dew point, resulting in water vapor condensing into fog on the glass surface.

 

In summer, if air conditioners are used indoors but the outdoor temperature is relatively high, the same situation may occur where the glass fogs up due to the temperature difference.

Iv. Other factors

 

During the initial stage of use of newly installed aluminum alloy doors and Windows with thermal break, the glass may fog up as the moisture in the material has not yet completely evaporated. However, this situation usually disappears on its own after a period of time.

 

After the house is renovated, the indoor humidity is relatively high. If the ventilation is poor, it is also easy to cause the glass of the doors and Windows to fog up.

 

Quick solution to fogging on the glass of aluminum alloy doors and Windows with broken bridge:

 

I. Emergency Response

 

1. Wipe the glass: Use a clean and soft cloth to gently wipe the fog on the glass surface, which can temporarily relieve the fogging phenomenon. But this is only a temporary solution, not a fundamental one. The fog might reappear.

 

2. Use anti-fogging agents: There are some specialized anti-fogging agents for glass on the market that can be sprayed on the glass surface to form an anti-fogging film, reducing the formation of fog. However, the effect of this method may vary depending on the product quality and the usage environment.

Ii. Long-term Solutions

 

1. Check the seal: Carefully inspect whether the sealant between the glass and the window frame is intact. If there is any aging or cracking, replace the sealant in time. Ensure that the thermal insulation strips of the aluminum alloy doors and Windows with broken bridge are installed correctly, without deformation or damage, to guarantee good sealing performance.

 

2. Replace the glass: If the glass itself has quality issues causing severe fogging, it is advisable to consider replacing the glass. Choose high-quality insulating glass with strong sealing performance to ensure that the desiccant inside the glass is effective and can absorb the water vapor that enters the glass interlayer.

 

3. Improve ventilation: Maintaining good indoor ventilation and reducing indoor humidity can decrease the possibility of glass fogging. When the weather is suitable, open the Windows for ventilation or use ventilation equipment such as exhaust fans and fresh air systems.

 

4. Regulate indoor temperature and humidity: Reasonably adjust the indoor temperature and humidity to avoid excessive temperature differences. In winter, a humidifier can be used to appropriately increase the indoor humidity, but it is important not to over-humidify. In summer, when using air conditioners, the temperature should not be set too low to avoid a large temperature difference with the outside.

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