MIL-PRF-15624G
APPENDIX A
A.4.3 Initial sealing pressure.
A.4.3.1 Determine initial pressure. To determine the initial sealing pressure, since material is initially indented
1.59 mm, the pressure should be increased incrementally from 0 psi in 10 psi intervals until the maximum leakage
rate is achieved. The hold period between intervals shall be 30 seconds to allow the material to respond. If the
specimen is over-pressured, the pressure shall be backed-off by 10 psi. Pressure shall then be applied in 2 psi
intervals to ensure that the sealing pressure measured is accurate. The hold period between intervals shall also be 30
seconds for the 2 psi intervals to allow the material to respond. Continue until the maximum leakage rate is
achieved. Make the initial leakage point, indentation of test specimen, and initial sealing pressure determinations at
a temperature of 73.4±3.6 °F (23±2 °C).
A.4.3.1.1 Number of tests. Test a minimum of two specimens from each sample. Test an additional specimen
if the sealing pressure deviates 5 percent from the average pressure.
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