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Sound-absorbing system of FC perforated panels, slot panels. (tested by reverberation room)
type
Spec.mm
perforating rate p%
structure nutshell
Sound-absorption of the following frequencies:?
125 250 500 1000 2000 4000
FCP5-1
FCP5-2
600*600*4
1200*600*4
(Circular hole）
8
 1、4mm FC perforated panels with 50mm hollow in the back 0.05 0.16 0.29 0.24 0.10
2、4mm FC perforated panels with 6mm acupunctated cloth on the back of the panel. 0.12 0.28 0.26 0.67 0.54 0.41
3、4mm perforated panels with 100m hollow in the back 0.21 0.41 0.68 0.60 0.41 0.34
4、4mm perforated panels,the cavity is filled with glass wool in 50mm thick. 0.53 0.77 0.90 0.73 0.70 0.66
FCP8-1
1200*600*4 (Circular hole）
4.5
 5、4mm FC perforated panels with 50mm hollow in the back 0.60 0.26 0.19 0.12? 0.10
6、4mm FC perforated panels with 6mm acupunctated cloth on the back of the panel. 0.14 0.36 0.75 0.62 0.35 0.26
7、4mm perforated panels with 100m hollow in the back 0.42 0.33 0.30 0.21 0.11 0.06
8、4mm perforated panels,the cavity is filled with glass wool in 50mm thick. 0.50 0.37 0.34 0.25 0.14 0.07
FCP10-1
FCP10-2
985*985*4
500*500*4
10.4
 9、4mm FC perforated panels with 50mm hollow in the back 0.02 0.10 0.21 0.14 0.12
10、4mm FC perforated panels with 6mm acupunctated cloth on the back of the panel. 0.11 0.24 0.54 0.67 0.58 0.53

Note: tested by the acoustics laboratory of Beijing Architecture Design Academy in Dec.1990.

Acoustic meter
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
31500
4000
Unperforated panels with 100mm bareness in the rear
0.39
0.22
0.16
0.13
0.15
0.12
0.13
0.08
0.06
0.06
0.05
Sparsely perforated panels with 100mm bareness in the rear. (Aperture 6, number 36, thickness 6, perforating rate 0.3%)
0.41
0.14
0.17
0.09
0.12
0.08
0.13
0.08
0.06
0.09
0.08
0.06
 0.06
0.07
0.04
0.07
0.10
Thickly perforated panels with 50mm bareness in the rear.
（FCP10-2）
0.08
0.19
0.30
0.28
0.43
0.49
0.56
0.74
0.82
0.90
0.93
0.92
0.81
0.76
0.63
0.50
0.51
Bar slot panels with 50mm bareness in the rear.
（FCP4-1)
0.08
0.25
0.25
0.32
0.59
0.59
0.67
0.83
0.77
0.90
0.77
0.74
0.63
0.55
0.45
0.39
0.40

Note: tested by acoustics laboratory of Broadcast, movie and TV designing Institute in May, 1992.

Sound-absorbing coefficient

Type & Spec.
Structure
Frequency 　　Hz
Sound-absorbing coefficient

Type
P10-4

Spec.
600x
600x
5mm

Aperture
10.4
mm

Perforating
rate
18.5%

100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
The back of the panels are attached with sound-absorbing yarn free cloth.
Hollow in the rear.50mm
0.08
0.16
0.20
0.28
0.32
0.40
0.52
0.68
0.88
0.92
0.88
0.92
0.88
0.80
0.60
0.40
0.44
0.48
0.65
Hollow in the rear.100mm
0.20
0.32
0.48
0.64
0.8
0.72
1.08
1.08
0.92
0.96
0.88
0.76
0.6
0.48
0.60
0.48
0.48
0.44
0.8
Hollow in the rear.200mm
0.6
0.72
0.84
1.16
1.08
0.72
1.04
0.92
0.84
0.56
0.52
0.76
0.68
0.64
0.60
0.56
0.52
0.52
0.8
Hollow in the rear.400mm
0.44
0.52
0.72
0.80
0.92
0.72
0.60
0.56
0.72
0.64
0.72
0.72
0.76
0.72
0.68
0.60
0.60
0.52
0.7
The back of the panels are attached with common yarn free cloth.
Hollow in the rear.50mm
0.08
0.12
0.08
0.04
0.12
0.16
0.20
0.32
0.40
0.48
0.56
0.64
0.48
0.44
0.32
0.24
0.28
0.36
0.35
Hollow in the rear.100mm
0.12
0.20
0.16
0.16
0.28
0.36
0.44
0.60
0.56
0.52
0.44
0.40
0.28
0.36
0.40
0.28
0.44
0.36
0.40
Hollow in the rear.200mm
0.16
0.44
0.48
0.52
0.60
0.52
0.68
0.52
0.32
0.24
0.28
0.44
0.44
0.44
0.36
0.36
0.40
0.44
0.45
Hollow in the rear.400mm
0.24
0.32
0.40
0.44
0.36
0.28
0.20
0.24
0.36
0.32
0.40
0.44
0.40
0.44
0.44
0.40
0.40
0.40
0.40
The back of the panels are added with 50mm thick glass wool.
Covered fully.
0.08
0.20
0.28
0.40
0.52
0.68
0.84
1.00
1.04
1.08
1.00
0.92
0.84
0.72
0.68
0.64
0.60
0.48
0.8
Hollow in the rear.50mm
0.16
0.28
0.40
0.56
0.76
0.88
1.08
1.12
1.12
1.00
0.84
0.84
0.84
0.88
0.72
0.60
0.60
0.44
0.90
Hollow in the rear.150mm
0.44
0.52
0.92
1.04
1.00
1.00
1.16
1.00
0.96
0.84
0.88
0.96
0.92
0.80
0.76
0.68
0.60
0.48
0.95
Hollow in the rear.400mm
0.52
0.52
0.68
0.72
0.88
0.84
0.80
0.80
1.00
0.92
0.92
0.92
0.88
0.88
0.84
0.68
0.60
0.52
0.85
The back of the panels are attached with common yarn free cloth and 50mm glass wool.
Covered fully.
0.08
0.24
0.24
0.28
0.60
0.76
0.96
1.00
1.12
1.20
1.00
1.00
0.80
0.76
0.60
0.64
0.68
0.56
0.85
Hollow in the rear.50mm
0.12
0.36
0.40
0.48
0.96
0.96
1.24
1.16
1.04
0.96
0.96
0.88
0.84
0.84
0.80
0.64
0.52
0.52
0.95
Hollow in the rear.150mm
0.48
0.52
0.80
0.92
1.24
1.08
1.24
1.08
1.04
0.92
0.88
1.04
0.88
0.88
0.72
0.64
0.56
0.52
1.00

Note: tested by acoustics academy of Yuejing Tongji University in May, 2002.

 
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