Theory of Sound Absorption of Glass Wool (Chapter 3)?The sound absoption rate of glass wool also has close relationship with the fixing condition, the sound absoption ratio for low frequency will increase remarkablely if the glass wool material be fixed with air layer behind than against the hard surface closely, the sound absoption rate will increase as the thickness grows, but no evident effection if the thickness becomes to some certain degree.?Meanwhile, the overlay of Glass Wool with increasing density can gain better sound absorption effection, for example, we place a glass wool batt with density 24kg/m3 and thickness 2.5cm then overlay the glass wool density 32kg/m3 and thickness 2.5cm, the sound absorption rate will better than one layer glass wool with the density 32kg/m3 thickness 5cm.
