MIL-PRF-24699A (SH)
TABLE X. Minimum sound transmission loss values in dB for type I, class 1.
One-third octave band center frequency in Hz
Hz
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
dB
13
10
10
13
14
15
17
19
21
22
25
26
28
30
32
33
35
37
TABLE XI. Minimum sound transmission loss values in dB for type I, class 2.
One-third octave band center frequency in Hz
Hz
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
dB
12
12
12
14
16
17
19
21
23
24
26
28
30
32
34
36
38
39
TABLE XII. Minimum sound transmission loss values in dB for type I, class 3.
One-third octave band center frequency in Hz
Hz
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
dB
15
14
14
18
19
20
22
24
27
28
31
32
33
36
38
40
42
43
3.10.2 Type II material. Sound transmission loss values of type II barrier material in decibels shall be not
less than the minimum values specified in Table XIII.
TABLE XIII. Minimum sound transmission loss values in dB for type II.
One-third octave band center frequency in Hz
Hz
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
dB
15
12
18
28
34
39
43
45
50
53
56
57
57
58
60
65
67
69
3.11 Toxicity. When evaluated in accordance with 4.4.9, the barrier material shall have no adverse effect
on the health of personnel when used for its intended purpose and shall not cause any environmental problems
during waste disposal (see 4.4.9 and 6.5).
3.12 Workmanship. The material shall be free of cracks, scratches, dents, imbedded particles, broken
edges or corners, and other defects which could affect serviceability.
3.13 Off-gassing. The barrier material shall meet the requirements in the Nuclear Powered Submarine
Atmosphere Control Manual, NAVSEA Technical Manual S9510-AB-ATM-010 Rev 2, for a usage category of
Limited (see 4.4.10 and 6.6).
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a. First article inspection (see 4.2).
b. Conformance inspection (see 4.3).
4.1.1 Inspection conditions. Unless otherwise specified, all inspections shall be performed in
accordance with the test conditions specified herein.
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