Soundproof glass can indeed effectively reduce noise, but its soundproofing effect varies significantly due to factors such as glass type, structural design, and installation process. The following is an analysis of the key points:

The sound insulation principle of soundproof glass

Soundproof glass mainly reduces noise through the following mechanisms:

Blocking the transmission of sound waves: Sound needs a medium to propagate. Vacuum glass reduces the air medium by vacuuming, which can theoretically block most sound waves.

Absorbing and attenuating vibrations: The PVB or EVA film in the middle of the laminated glass (laminated glass) acts as a damping layer, which can absorb sound wave energy and suppress glass vibration, thereby reducing sound transmission.

Multi-layer structure interference: Composite structures (such as hollow + laminated) interfere with sound waves of different frequencies through the combination of different materials and thicknesses, especially for low-frequency noise (such as traffic noise).

Common soundproof glass types and effects comparison

• Laminated glass (laminated glass)

Advantages: The best sound insulation effect, especially good at blocking medium and low frequency noise (such as vehicle engine sound). The higher the density and thickness of the middle PVB film, the stronger the sound insulation effect.

Data support: The sound insulation of 5+5mm laminated glass can reach 38 decibels, which is better than the 26 decibels of insulating glass.

Applicable scenarios: high noise environments such as street-side residences and recording studios.

• Insulating glass

Advantages: Good thermal insulation performance, but limited sound insulation effect, especially poor effect on low-frequency noise. The middle air layer is prone to resonance, which may amplify noise.

Applicable scenarios: non-street areas or environments with low sound insulation requirements.

• Vacuum glass

Advantages: Theoretically, the sound insulation effect is the best (the vacuum layer blocks sound waves), but in reality, the sound insulation effect is limited because tiny supports need to be added between the glass to form a "sound bridge". In addition, the cost is high and the life is short.

Data support: The sound insulation of vacuum glass is about 39 decibels, but the cost performance is low and the market application is less.

• Composite structural glass

Recommended solution: Hollow + laminated composite glass (such as 5+1.14PVB+5+12A+5), which has both sound insulation and heat insulation performance and is cost-effective.

Practical application suggestions

Street-side or high-noise environment: Prefer three-layer PVB laminated glass + plastic steel casement window, which can achieve a sound insulation of 35-40 decibels.

General residence: hollow laminated composite glass or double-layer laminated glass, balancing cost and effect.

Limited budget: Add sealing strips or thick curtains to reduce noise by about 5 decibels.