Glass type

Thickness/mm

Average sound insulation/dB

Increased sound insulation/dB

4T-0.3V-4T

8.3

34.78

-

5T-0.3V-5T

10.3

37.31

2.53

6T-0.3V-6T

12.3

39.34

2.03

7T-0.3V-7T

14.3

40.91

1.57

8T-0.3V-8T

16.3

42.24

1.33