Micro perforation single l ayer metallic panel
1.Specification : 1.0 mm / diameter 0.08 geometrically perforation.
2.Test temperture : 25.0 °c / Humidity :60%
3.Frequency range : According to ASTM C423norm.
According to the ASTM C423-02a，the noise reduction coefficient（NRC）~1/3 octave band centre frequency（Hz）
Airspace
100mm
1200mm
300mm
Centre frequencies(HZ)
Sound absorption coefficients
Sound absorption coefficients
Sound absorption coefficients
125
0.15
0.25
0.53
160
0.20
0.30
0.84
200
0.27
0.48
0.76
250
0.45
0.71
0.78
315
0.53
0.80
0.86
400
0.65
0.83
0.83
500
0.78
0.92
0.65
630
0.80
0.78
0.52
800
0.85
0.62
0.62
1K
0.90
0.56
0.70
1.25K
0.78
0.65
0.67
1.6K
0.62
0.66
0.67
2K
0.57
0.58
0.60
2.5K
0.58
0.53
0.57
3.15K
0.65
0.59
0.57
4K
0.58
0.56
0.55
NRC
0.70
0.70
0.70
Micro perforation dual layer metallic panel
1.Specification : 1.0 mm / diameter 0.08 geometrically perforation.
2.Test temperture : 25.0 °c / Humidity :60%
3.Frequency range : According to ASTM C423 norm.
According to the ASTM C423-02a，the noise reduction coefficient（NRC）~1/3 octave band centre frequency（Hz）
Double panels
50mm
50mm
100mm
Airspace
50mm
100mm
100mm
Centre frequencies(HZ)
Sound absorption coefficients
Sound absorption coefficients
Sound absorption coefficients
125
0.33
0.21
0.35
160
0.49
0.37
0.36
200
0.48
0.59
0.65
250
0.75
0.76
0.66
315
0.82
0.76
0.88
400
0.83
0.79
0.90
500
0.77
0.89
0.88
630
0.77
0.88
0.92
800
0.77
0.88
0.90
1K
0.80
0.89
0.87
1.25K
0.74
0.86
0.86
1.6K
0.72
0.85
0.78
2K
0.68
0.80
0.72
2.5K
0.59
0.77
0.75
3.15K
0.56
0.69
0.71
4K
0.41
0.66
0.67
NRC
0.75
0.85
0.685
CKM BUILDING MATERIAL CORP. No.9, Industrial Road, Kuan Tien Hsiang, Tainan Hsien Taiwan
TEL：886-6-6986623 FAX： 886-6-6990272
