All about glass > Classification acoustique Cekal

Cekal, the French glass certification association, has defined  6 AR ratings from AR1 to AR6, according to the minimum value
of the glazing unit sound reduction index: R  

Cekal Acoustic Reinforced ratings:  AR

AR AR1 AR2 AR3 AR4 AR5 AR6
R en dBa 25 à 27 28 à 29 30 à 32 33 à 34 35 à 36 37 et plus