Spray-Applied Acoustical Materials Comparison

1, NRC (Noise Reduction Coefficient)

Product

thickness

mounting

Sound absorption coefficient (Hz)

mm

125

250

500

1000

2000

4000

NRC

Z146

44

Solid

0.13

0.30

0.84

1.04

1.01

1.01

0.80

Z106

44

Solid

0.33

0.57

0.85

0.89

0.87

0.82

0.80

MK6

25

Solid

0.04

0.30

0.80

1.00

0.88

0.93

0.75

Pyrok

25

Solid

0.18

0.35

0.64

0.73

0.73

0.77

0.60

44

Solid

0.24

0.59

0.74

0.81

0.91

0.97

0.75

Taipei subway

25

 

 

 

 

 

 

 

0.55

Taipei MRT-I

25

 

0.28

0.34

0.60

0.69

0.61

0.69

0.55

Taipei MRT-II

70

 

 

 

0.70

 

 

 

0.70

@

2, Physical Properties

Product

Composition

Density kg/m3

Flame spread index class

Z146

light weight aggregate +cement+fiber

640

A

Z106

light weight aggregate +cement+fiber

352

A

MK6

light weight aggregate +gypsum+fiber

240

A

Pyrok

Vermiculite + cement

500 - 700

A

Taipei subway

Asbestos free

288

A

Taipei MRT

Vermiculite + cement

500 - 700

A

@

@