MIL-DTL-25421C
TABLE I. Longitudinal 1/ Mechanical Properties of Epoxy Laminates (Types I and II)
at Standard Temperature (23°C)
Glass Fiber
Base
Tensile Strength
Compression
Flexural Strength
Flexural Modulus of
Thousands of psi
Strength
(Ultimate)
Elasticity (Initial)
(Minimum
Thousands of psi
Thousands of psi
Millions of psi
Cloth number 2/
Average)
(Minimum Average)
(Minimum Average)
(Minimum Average)
3/
3/
3/
3/
Wet
Wet
Wet
Wet
Standard
Standard
Standard
Standard
Laminated) Conditions Conditions Conditions
Conditions
Conditions
Conditions
(Parallel
Conditions
Conditions
(I)
112
47
45
47
42
70
65
3.3
3.2
(IA)
112-150
47
45
47
42
70
65
3.3
3.2
(II)
116
47
45
43
39
63
58
3.3
3.2
(IIA)
116-150
47
45
43
39
63
58
3.3
3.2
(III)
120
47
45
47
42
70
65
3.3
3.2
(IV)
128
47
45
33
30
63
58
3.3
3.2
(IVA)
128-150
47
45
33
30
63
58
3.3
3.2
(IVB)
128-750
47
45
33
30
63
58
3.3
3.2
(V)
143
90
85
68
60
115
110
5.2
5.0
(VA)
143-150
90
85
68
60
115
110
5.2
5.0
(VI)
162
47
45
23
20
49
45
2.8
2.6
(VII)
164
39
35
31
28
49
45
2.8
2.6
(VIIA)
164-150
39
35
31
28
49
45
2.8
2.6
(VIII)
181
48
45
50
45
75
65
3.2
3.2
(VIIIA)
181-150
48
45
50
45
75
65
3.2
3.2
(VIIIB)
181-750
48
45
50
45
75
65
3.2
3.2
(IX)
182
50
47
46
41
70
65
3.3
3.2
(IXA)
182-150
50
47
46
41
70
65
3.3
3.2
(X)
183
50
47
43
39
63
58
3.3
3.2
(XI)
184
50
47
37
33
63
58
3.3
3.2
(XIA)
184-150
50
47
37
33
63
58
3.3
3.2
Mat,
short fibers
1.5
25
23
1.7
30
25
35
30
(Random
laminated)
Mat, nonwoven
continuous
filament
Laminated as
specified
Crossplied
60
55
55
50
100
85
3.3
3.2
Isotropic
40
35
45
40
65
58
2.5
2.5
Unidirectional
100
90
70
62
125
110
5.0
5.0
1/
Except that volume for random laminated and isotropic laminated materials are for random
oriented specimens and values for crossplied laminates are for specimens cut in the stronger
principal direction. By "longitudinal" is meant the warp directions of the parallel laminated cloth
base or filament direction of the unidirectional mat base.
2/
Arabic numerals show the base cloth identification numbers under this specification.
Parenthetical Roman numerals show, for information only, the cloth type designations under
SAE AMS-C-9084.
3/
Dimensional measurements for the determination of mechanical properties under wet conditions
are taken before immersion.
5
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