Frequency (Hz)
(B:1)
125 250 500 1000 2000 3150 4000 6300 8000 NRR
CSA
Class
Mean attenuation (dB)
(B:2)
18.6 27.4 35.9 38.9 35.8 37.7 37.0 36.4 38.0
26 A 373 g
Std deviation (dB)
(B:3)
4.1 3.3 3.1 2.9 2.9 3.0 2.4 3.8 5.0
Headband with foam cushion
MT15H7AWS6**
ANSI S3.19-1974
Frequency (Hz)
(B:1)
125 250 500 1000 2000 3150 4000 6300 8000 NRR
CSA
Class
Mean attenuation (dB)
(B:2)
17.3 24.3 33.4 35.9 35.0 37.8 37.0 37.7 39.8
24 A 357 g
Std deviation (dB)
(B:3)
4.4 4.6 3.7 3.0 3.1 2.4 2.6 2,.6 3,9
Neckband with foam cushion
MT15H7BWS6**
ANSI S3.19-1974
Frequency (Hz)
(B:1)
125 250 500 1000 2000 3150 4000 6300 8000 NRR
CSA
Class
Mean attenuation (dB)
(B:2)
19.3 25.1 35.0 38.7 34.5 35.3 34.9 36.1 38.5
26 A 395 g
Std deviation (dB)
(B:3)
3.6 2.9 3.1 2.1 2.5 2.1 2.4 2.8 4.1
Helmet attachment with foam cushion on 3M
TM
H-700 Hard Hat
MT15H7P3EWS6**
ANSI S3.19-1974
B
Frequency (Hz)
(B:1)
125 250 500 1000 2000 3150 4000 6300 8000 NRR
CSA
Class
Mean attenuation (dB)
(B:2)
17.5 23.3 34.6 39.2 36.1 38.2 38.5 38.7 40.0
27 A 457 g
Std deviation (dB)
(B:3)
2.6 2.0 3.2 2.8 2.7 2.6 2.1 1.9 2.5
Helmet attachment with gel cushion 3M
TM
H-700 Hard Hat
MT15H7P3EWS6**
ANSI S3.19-1974
Frequency (Hz)
(B:1)
125 250 500 1000 2000 3150 4000 6300 8000 NRR
CSA
Class
Mean attenuation (dB)
(B:2)
16.9 22.5 33.4 39.9 35.2 37.6 36.1 36.7 37.5
27 A 432 g
Std deviation (dB)
(B:3)
2.6 2.2 2.5 1.8 1.9 1.7 2.6 1.8 1.7
Headband with gel cushion
MT15H7AWS6**
ANSI S3.19-1974
Frequency (Hz)
(B:1)
125 250 500 1000 2000 3150 4000 6300 8000 NRR
CSA
Class
Mean attenuation (dB)
(B:2)
16.6 22.6 32.3 37.7 37.6 38.7 37.8 39.5 40.3
26 A 425 g
Std deviation (dB)
(B:3)
3.6 2.2 2.4 2.4 2.8 2.9 2.5 2.4 2.0
Neckband with gel cushion
MT15H7BWS6**
ANSI S3.19-1974