What Causes Fog Inside the Glass?

[DeJason]

The reasons for fog inside the glass and their solutions are as follows: 1. Closed balance holes: The absence or improper placement of air pressure balance holes and drainage holes prevents water from draining, leading to long-term evaporation and moisture entering the glass interlayer, causing fog. Solution: Use insulated glass whenever possible, as it can significantly reduce this phenomenon. 2. Improper positioning: Incorrect installation position of the spacer bar, where it is adhered along the edges of the glass without leaving a gap, makes it prone to direct contact with rainwater. After absorbing moisture, it generates vapor between the glass panes. Solution: Install glass spacers, ensuring the spacer bar is placed 1-2mm away from the glass edges and 3-4mm from the bottom edge of the glass. This prevents direct contact with water. Additionally, choose high-quality spacer bars with low water absorption. 3. Inadequate sealing: Poor sealing of the glass, with uneven or incomplete application of sealant around the edges. Solution: Ensure tight sealing of the glass, paying careful attention during the application process.