megapro90.pro

megapro90Sound Ratings (ASTM E90-02, E989-89, E492-90) STC (Sound Transmission Class) 72* IIC (Impact Insulation Class) 72* *Sound testing performed as to ASTM E90 and E492, testSound Ratings (ASTM E90-02, E989-89, E492-90) STC (Sound Transmission Class) 52* IIC (Impact Insulation Class) 50* *Sound testing performed as to ASTM E90 and E492, test