Who has a better sound proof function between insulated glass and laminated glass

Insulated glass and laminated glass are widely used in aluminum windows and doors, but they perform differently in sound insulation.

Insulated Glass Unit (IGU) consists of two or more panes separated by an air space sealed with spacers and desiccant. The dry air gap reduces medium and high-frequency noise such as human voice and car horns. It also provides excellent thermal insulation, which saves energy for buildings. Its limitation is poor performance for low-frequency noise like subway and heavy truck vibration.

Laminated glass is made with two glass sheets bonded by PVB or SGP interlayer. The polymer interlayer absorbs vibration and suppresses resonance, delivering better low-frequency sound insulation. Another key benefit is safety: when broken, glass fragments stick to the interlayer and will not fall off. The downside is its weaker thermal performance and higher cost compared with standard insulated glass.

Selection Guide for Projects

1.Normal residential projects needing heat insulation and daily noise reduction: Choose insulated glass, double glazing or triple glazing with Low-E coating.

2.Buildings near highways, railways or airports with strict sound requirements: Laminated insulated glass (combination of laminated pane + insulated air cavity) is recommended.

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