MIL-DTL-25421C
TABLE II. Longitudinal 1/ Mechanical Properties of Epoxy Laminates at Elevated
Temperatures
Glass Fiber
Base
Types I and II
TYPE II
TYPE II
At 70°C
At 260°C
At 260°C
after ½ hour at
after ½ hour at 260° C
after 192 hours at
Cloth number 2/
70°C
260° C
Flexural
Flexural
Flexural
Flexural modulus of
Compres-
Flexural
modulus of
Flexural
modulus of
Strength elasticity
Tensile
sive
Strength
elasticity
Strength
elasticity
(Ultimate) (Initial)
Strength
Strength
(Ultimate)
(Initial)
(Ultimate)
(Initial)
(Thousands (Millions of (Thousands (Thousands (Thousands (Millions of
(Thousands (Millions of
of psi)
psi)
of psi)
of psi)
of psi)
psi)
of psi)
psi)
(Minimum (Minimum (Minimum
(Minimum
(Minimum
(Minimum
(Minimum
(Minimum
(Parallel
Laminated) Average) Average)
Average)
Average)
Average)
Average)
Average)
Average)
(I)
112
65.0
3.2
20.0
10.0
22.0
2.0
18.0
1.8
(IA)
112-150
65.0
3.2
20.0
10.0
22.0
2.0
18.0
1.8
(II)
116
58.0
3.2
20.0
8.0
20.0
2.0
15.0
1.8
(IIA)
116-150
58.0
3.2
20.0
8.0
20.0
2.0
15.0
1.8
(III)
120
65.0
3.2
20.0
10.0
22.0
2.0
18.0
1.8
(IV)
128
58.0
3.2
20.0
8.0
20.0
2.0
15.0
1.8
(IVA)
128-150
58.0
3.2
20.0
8.0
20.0
2.0
15.0
1.8
(IVB)
128-750
58.0
3.2
20.0
8.0
20.0
2.0
15.0
1.8
(V)
143
105.0
5.0
42.0
16.0
40.0
3.3
29.0
2.8
(VA)
143-150
105.0
5.0
42.0
16.0
40.0
3.3
29.0
2.8
(VI)
162
45.0
2.8
20.0
6.0
15.0
2.0
11.0
1.4
(VII)
164
45.0
2.8
20.0
6.0
15.0
2.0
11.0
1.4
(VIIA)
164-150
45.0
2.8
20.0
6.0
15.0
2.0
11.0
1.4
(VIII)
181
65.0
3.2
45.0
10.0
25.0
2.3
20.0
1.9
(VIIIA)
181-150
65.0
3.2
45.0
10.0
25.0
2.3
20.0
1.9
(VIIIB)
181-750
65.0
3.2
45.0
10.0
25.0
2.3
20.0
1.9
(IX)
182
65.0
3.2
21.0
10.0
22.0
2.0
18.0
1.8
(IXA)
182-150
65.0
3.2
21.0
10.0
22.0
2.0
18.0
1.8
(X)
183
58.0
3.2
21.0
8.0
20.0
2.0
15.0
1.8
(XI)
184
58.0
3.2
21.0
8.0
20.0
2.0
15.0
1.8
(XIA)
184-150
58.0
3.2
21.0
8.0
20.0
2.0
15.0
1.8
Mat,
short fibers
32.0
1.6
12.0
8.0
11.0
1.0
8.5
0.85
(Random
laminated)
Mat, nonwoven
continuous
filament
Laminated as
specified
Crossplied
80.0
3.0
28.0
11.0
31.0
2.0
25.5
1.8
Isotropic
60.0
2.2
17.0
9.0
20.0
1.5
16.0
1.4
Unidirectional
100.0
4.5
42.5
15.0
39.0
3.0
32.0
2.6
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.
6
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business