MIL-DTL-62474F
3.3.1.2 Weights. The unit weight or areal density of the finished class A or class B
laminates shall fall within the ranges established by table I (see 4.3.4.1).
TABLE I. Finished laminate unit weights for Class A and Class B. 1/
Plies wt (lb/ft2)
Plies wt (lb/ft2)
Plies wt (lb/ft2)
Plies wt (lb/ft2)
1
0.127-0.152 11
1.40-1.67 21
2.67-3.18
31
3.95-4.69
2
0.255-0.303 12
1.53-1.82 22
2.80-3.33
32
4.08-4.85
3
0.382-0.454 13
1.65-1.97 23
2.93-3.48
33
4.20-5.00
4
0.510-0.606 14
1.78-2.12 24
3.06-3.64
34
4.33-5.15
5
0.637-0.757 15
1.91-2.27 25
3.18-3.79
35
4.46-5.30
6
0.765-0.908 16
2.04-2.42 26
3.31-3.94
36
4.59-5.45
7
0.892-1.06
17
2.16-2.58 27
3.44-4.09
37
4.71-5.60
8
1.02-1.21
18
2.29-2.73 28
3.57-4.24
38
4.84-5.75
9
1.14-1.37
19
2.42-2.88 29
3.69-4.39
39
4.97-5.91
10
1.27-1.57
20
2.55-3.03 30
3.82-4.54
40
5.10-6.06
2
1/ pounds per square foot (lb/ft )
TABLE Ia. Finished laminate unit weights for Class A and Class B. 1/
Plies wt (kg/m2)
Plies wt (kg/m2)
Plies wt (kg/m2)
Plies wt (kg/m2)
1
0.62-0.74
11
6.84-8.15
21
13.04-15.53 31 19.29-22.90
2
1.25-1.48
12
7.47-8.89
22
13.67-16.26 32 19.92-23.68
3
1.87-2.22
13
8.06-9.62
23
14.31-16.99 33 20.51-24.41
4
2.49-2.96
14
8.69-10.35
24
14.94-17.77 34 21.14-25.15
5
3.11-3.70
15
9.33-11.08
25
15.53-18.51 35 21.78-25.88
6
3.74-4.43
16
9.96-11.82
26
16.16-19.24 36 22.41-26.61
7
4.36-5.18
17
10.55-12.60 27
16.80-19.97 37 23.00-27.34
8
4.98-5.91
28
11.18-13.33 28
17.43-20.70 38 23.63-28.08
9
5.57-6.69
19
11.82-14.06 29
18.02-21.44 39 24.27-28.86
10
6.20-7.42
20
12.45-14.80 30
18.65-22.17 40 24.90-29.59
1/ kilograms per square meter (kg/m2)
3.3.2 Lamination pressures and temperatures. The following conditions shall prevail
during lamination processes (see 4.3.3):
a. Type I and II.
1. Type I (flat) laminates shall be press-molded at 250 +10 pounds per square
inch (psi) [1725 +69 kilopascals (kPa)].
2. Type II (molded) laminates shall be press-molded at 200 +10 psi (1380 +69
kPa) or may be autoclaved at 50 psi (345 kPa) minimum.
Pressures indicated above shall be maintained until the following stages have been completed.
6
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