FED-STD-791D
7.2 Calculate the percentage change in hardness (H) of each rubber sample as follows:
(C - D) 100
H=
C
where:
H = change in hardness, percent.
C = hardness before test.
D = hardness after test.
7.3 Calculate the change in tensile strength.
7.3.1 Observed tensile strength.
F/E = tensile strength in mPa (psi).
F = observed force at break in N (lb).
E = Cross-sectional area of the unstretched specimen in cm2 (in2).
7.3.2 Change in tensile strength, percent
(J - K) 100
T=
J
where:
T = change in tensile strength, percent.
J = tensile strength before test.
K = tensile strength after test.
NOTE 2:
See section 6.6.5.3
8. REPORTING
8.1 The report shall include the following:
8.1.1 Results calculated in accordance with paragraph 7, Calculations.
8.1.2 All observed and recorded data on which the calculations are based.
8.1.3 Date of test.
8.1.4 Temperature of test.
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