The sealing performance of aluminum alloy windows.

The sealing performance of aluminum alloy windows directly determines their sound insulation, heat insulation, waterproofing, and dustproof effects, and is a core indicator of window and door quality.

Core Indicators of Sealing Performance (How to determine "good sealing")

To determine whether an aluminum alloy window has good sealing performance, first look at these four key indicators, all of which are essential:

Air tightness: Prevents air penetration, affecting heat insulation, sound insulation, and dust prevention. The national standard is divided into 6 levels; for home decoration,   ≥ level 6   (the highest level) is considered qualified.  Casement windows generally reach levels 6-8.

Water tightness: Prevents rainwater leakage. The national standard is divided into 9 levels; for coastal areas/high-rise buildings,   ≥ level 7   is recommended, and for ordinary homes, ≥ level 6 is sufficient.

Wind pressure resistance: Resists deformation from strong winds. The national standard is divided into 9 levels; for high-rise buildings (≥10 floors),   ≥ level 8   is recommended, and for low-rise buildings, ≥ level 6 is sufficient.

Sound insulation: Directly related to sealing. For buildings near streets/high-speed railways,   ≥ 35dB   is required; for ordinary residential buildings, ≥ 30dB is sufficient.