MIL-PRF-15624G
APPENDIX A
METHOD FOR EVALUATING RUBBER PROPERTY - SEALING PRESSURE
A.1 SCOPE
A.1.1 Scope. This method is intended for use in determining the sealing pressure of soft, vulcanized rubber
intended particularly for gaskets used for sealing against low air pressure. This Appendix is a mandatory part of the
specification. The information contained herein is intended for compliance.
A.2 APPARATUS
A.2.1 Indenting device. The indenting device shall be of a design capable of indenting the specimen a
specified amount with an accuracy of ±0.0005 inch (±0.01 mm). A suitable type is illustrated on figure A-1.
Specimen and indentor may or may not be rotated relative to each other during the indenting operation.
A-2
FIGURE A-1. Typical indenting apparatus.
A.2.2 Indentor. The indentor tip shall be hemispherical in shape having a diameter of 0.250, +0.001/ -0.000
inch (6.32 to 6.35 mm) and an orifice 0.040 to 0.042 inch (1.00 to 1.05 mm) in diameter located as illustrated on
figure A-2. The material shall be corrosion resisting steel. The surface of the hemispherical tip shall be free of
scratches or surface defects.
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