MIL-PRF-23653D
TABLE IV. Class 2.5 tiles (3.1 lb/ft²), vibration damping characteristics.
Percent Critical Damping at
Nominal Frequency at
Lengthwise
Indicated Temperatures
75 °F (12.8 °C) of
Flexural
(Minimum)
⅜ × 3 × 40" Covered Bar
Mode
Number
(Hz)
75 °F (23.9 °C)
95 °F (35.0 °C)
1
45
5.4
3.0
3
260
5.8
5.3
5
670
5.2
6.5
7
1250
4.4
6.5
9
1990
3.4
6.0
11
2890
3.0
5.0
13
3830
2.8
5.0
TABLE V. Class 3 tiles (4.5 lb/ft²), vibration damping characteristics.
Percent Critical Damping at Indicated
Nominal Frequency at
Lengthwise
Temperatures (Minimum)
115 °F (46.6 °C) of
Flexural
⅜ × 3 × 40" Covered Bar
Mode
95 °F
115 °F
135 °F
155 °F
Number
(Hz)
(35.0 °C)
(46.1 °C)
(57.2 °C)
(68.3 °C)
1
50
6.0
5.0
2.0
---
3
305
6.0
7.0
5.0
1.0
5
770
4.5
6.0
5.5
2.0
7
1425
4.5
6.0
6.0
3.0
9
2220
3.5
5.0
5.0
3.0
11
3200
3.5
5.0
5.0
3.0
13
4290
3.5
5.0
5.0
3.0
3.12 Workmanship. The tiles shall be examined for defects and workmanship. The finished tiles shall be free
of segregated particles. Blisters shall not exceed a height of 1/16 inch. Minor surface voids and minor cracks will not
be cause for rejection. The surface shall be free of wax or other substances which may interfere with subsequent
adhesion (see 4.3.3).
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
Qualification inspection (see 4.2).
b.
Conformance inspection (see 4.3).
4.2 Qualification inspection. Qualification inspection shall be conducted at a laboratory satisfactory to the
Naval Sea Systems Command (NAVSEA). Government representatives may witness qualification inspections.
4.2.1 Samples for qualification tests. The samples for qualification testing of Classes 1, 2, and 3 shall consist
of 10 tiles, each 12 by 12 inches and weighing 4.5±0.2 lb/ft². The samples for qualification testing of Class 2.5 tiles
shall consist of 10 tiles, each 12 by 12 inches and weighing 3.1±0.1 lb/ft².
4.3 Conformance inspection. Conformance inspection shall include the examination and tests specified in 4.3.3
and 4.3.4. Government representatives may witness conformance inspections.
5
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