What is the sound insulation effect of tempered glass
Information summary：The sound insulation effect of tempered glass is not very good, and it needs to be comprehensively judged based on the glass structure, thickness, and installation process. The core depends on its ability to block "air sounds" (such as speech and traffic sounds), which can be analyzed from the following dimensions:
The sound insulation effect of tempered glass is not very good, and it needs to be comprehensively judged based on the glass structure, thickness, and installation process. The core depends on its ability to block "air sounds" (such as speech and traffic sounds), which can be analyzed from the following dimensions:
1. Single piece tempered glass: limited sound insulation effect, thickness is key
The sound insulation logic of ordinary single piece tempered glass (such as common 5mm, 8mm, 12mm) is consistent with that of ordinary glass - mainly relying on the "quality law" (the larger the material quality, the better the air sound barrier effect).
Thin tempered glass (5-8mm): The sound insulation effect is weak, only able to isolate some high-frequency noise (such as human voices), and has poor blocking ability for low-frequency noise (such as car engines, air conditioning outdoor unit roar). It is commonly used in scenes with low sound insulation requirements (such as indoor partitions, ordinary shop windows).
Thick tempered glass (12mm and above): The sound insulation performance increases with thickness, which can further weaken mid to low frequency noise. However, the limited thickness of a single piece of glass cannot completely solve the noise problem and still cannot meet the high demand for sound insulation in bedrooms, offices, etc.
2. Tempered insulated glass: Improved sound insulation effect, is the mainstream choice
In practical scenarios, if tempered glass is required to have both high strength and sound insulation, tempered insulating glass (consisting of 2-3 pieces of tempered glass with a 12-20mm air layer sandwiched in between and sealed with sealant) is a better solution. Its sound insulation advantage comes from the "air layer buffering":
The air layer can block the direct propagation of sound, and combined with the quality barrier of tempered glass itself, it can effectively weaken mid to high frequency noise. The barrier to low-frequency noise is also 30% -50% higher than that of a single piece of glass (such as 12mm+12A air layer+12mm tempered insulating glass, the sound insulation volume can reach 35-40 decibels, which can greatly reduce the impact of traffic, square dancing and other noise).
If inert gases (such as argon) are filled in the air layer, the sound insulation and thermal insulation performance can be further optimized, which is suitable for scenarios with high sound insulation requirements (such as street facing residences and hotel rooms).
3. Key factors affecting sound insulation effectiveness
In addition to the glass structure, the following details will directly affect the sound insulation performance:
Sealing process: The gaps between glass and window frames, as well as between window frames and walls, are the "short boards" of sound insulation. If the sealant ages and the gaps are not filled with sound insulation cotton, noise will penetrate through the gaps, and even the best glass cannot function effectively.
Glass spacing: The air layer of insulating glass is not necessarily the wider the better, usually 12-20mm is a better range. Being too wide or too narrow can lead to a decrease in sound insulation performance.
Resonance problem: If the glass is rigidly connected to the window frame too tightly, it may cause "resonance" and amplify specific frequency noise (such as certain low-frequency vibrations), which needs to be reduced by elastic seals (such as EPDM rubber strips).
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