MIL-DTL-25421C
TABLE VI. Laminate Test of Sheets or Parts
Number of
determinations per
Property
Requirement
Method 1/
sample unit
Specific gravity
3.5.1
5011 or 5012
1
Resin content
3.5.1
7061
3
Barcol hardness
3.5.1
4.7.1
10
Tensile strength:
Standard conditions
Table I
1011 2/
5
Wet conditions
Table I
1011 2/
5
260°C, ½ hour (Type II only)
Table II
1011 2/
5
Compressive strength:
Standard conditions
Table I
1021 3/
5
Wet conditions
Table I
1021 3/
5
260°C, ½ hour (Type II only)
Table II
1021 3/
5
Flexural strength, Ultimate
Standard conditions
Table I
1031 4/
5
Wet conditions
Table I
1031 4/
5
70° C, ½ hour
Table II
1031 4/
5
260°C, ½ hour (Type II only)
Table II
1031 4/
5
260°C, 192 hours (Type II only)
Table II
1031 4/
5
Flexural modulus of elasticity, initial
Standard conditions
Table I
1031 4/
5
Wet conditions
Table I
1031 4/
5
70° C, ½ hour
Table II
1031 4/
5
260°C, ½ hour (Type II only)
Table II
1031 4/
5
260°C, 192 hours (Type II only)
Table II
1031 4/
5
Dielectric constant at 1 megacycle
(Class 2 Only):
Standard conditions
Table III
4021
4
After immersion
Table III
4021
4
Loss tangent at 1 megacycle (Class 2 only):
Standard conditions
Table III
4021
4
After immersion
Table III
4021
4
Dielectric constant at 8,500 to 10,000
megacycles (Class 3 only):
Standard conditions
Table III
4.7.2
4
After immersion
Table III
4.7.2
4
Loss tangent at 8,500 to 10,000 megacycles
(Class 3 only):
Standard conditions
Table III
4.7.2
4
After immersion
Table III
4.7.2
4
1/
Method references other than paragraph numbers refer to methods of ASTM D2240.
2/
Tensile specimens to be Type II of Method 1011.
3/
Compression specimens to be tested edgewise by thin-sheet procedure.
4/
Flexural specimens to be tested flatwise.
12
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