How Is the Sound-Insulation Effect of System Windows Achieved?

1) Core sound-insulation structure design. Multi-chamber profile: the frame uses multi-chamber thermal-break aluminium (commonly 3–6 chambers) filled with sound-absorbing cotton or foam; different media (aluminium, air, cotton) reflect and attenuate sound repeatedly. Insulating glass: double/triple glazing such as 5 mm + 12A + 5 mm (glass + air-layer); wider air layers insulate better (gains diminish beyond 15 mm). Laminated glass: a PVB film (e.g. 5 + 0.76PVB + 5) filters low-frequency noise such as traffic rumble. Argon filling in the cavity further improves sound and heat insulation. Sealing system: multiple EPDM gaskets (3–5 between frame and sash) plus hidden drainage that avoids the noise leaks of open drain holes.