Fiberglass Baffle 1/3 Octave Center Frequency (Hz)
Absorption Coefficient
100
0.68
125
0.60
160
0.96
200
0.92
250
0.84
315
1.00
400
1.00
500
0.96
630
1.00
800
0.96
1000
1.08
1250
1.08
1600
1.08
2000
1.16
2500
1.16
3150
1.16
4000
1.12
5000
1.08
Practical Absorption Coefficient αp
Reference Absorption Coefficient
0.75
0.90
0.80
1.00
1.00
1.00
1.00
1.00
1.00
1.00
0.90
NRC = 1.00 (EN ISO 11654:1997)
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Main Specification
National Standard
Main Properties
Surface Material
700#
Thickness (mm)
40
Volume Weight
(KG/M3)
120
Noise Reduction Coefficient
GBJ47-83
NRC=1.00
Level of Fireproof
GB8624-1997
A CLASS
Thermal Insulation
JC/T670-2005
≥0.40(m2*k)/w
Damp Rate
JC/T670-2005
0.7mm
Bending Destroying Loading
JC/T670-2005
≥40N
Moisture Rate
JC/T670-2005
≤3.0
Size Tolerance
JC/T670-2005
±1.0mm
Limit of Radionuclide
GB/T6566-2001
Sniffable particulate matter
GB/T18883-2002
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Ira≤1.0,
Ir≤1.3
≤0.03g/m3