MIL-PRF-15624G
4.6 Test methods. Unless otherwise indicated in the test method, tests shall not be conducted on the test
specimens prior to a conditioning period of 4 hours at room temperature 73.4±3.6 °F (23±2 °C). Sample preparation
may be undertaken without regard to this time interval.
4.6.1 Tensile properties. Tensile strength, ultimate elongation, and tensile stress (modulus) at 100 percent
elongation shall determined in accordance with ASTM D412, Test Method A, using Die C specimens 0.080±0.010
inch thick.
4.6.2 Hardness. The hardness shall be determined in accordance with ASTM D2240 using a Type A
durometer.
4.6.3 Specific gravity. The specific gravity shall be in accordance with ASTM D792.
4.6.4 Sealing pressure. The sealing pressure shall be determined in accordance with A.4 of Appendix A.
4.6.5 Oven aging. ASTM D573 shall be used for oven aging. The aging conditions shall be 46±¼ hours at
194±1.8 °F (90±1 °C).
4.6.5.1 Tensile properties after oven aging. The tensile strength, ultimate elongation and tensile stress
(modulus) at 100 percent elongation after oven aging shall be determined by the procedure in 4.6.1.
4.6.5.2 Hardness after oven aging. The hardness after oven aging shall be determined by the procedure in
4.6.5.3 Compression set after oven aging. Hot compression set after oven aging shall be determined in
accordance with ASTM D395, Test Method B except that specimens shall be clamped to 40 percent deflection
during the oven aging and the time and temperature of aging shall be as specified in 4.6.5.
4.6.5.4 Sealing pressure after oven aging. Sealing pressure after oven aging shall be determined in accordance
with A.4 of Appendix A.
4.6.6 Tensile properties after light aging. Specimens shall be light-aged in accordance with ASTM D2565,
except the specimens shall be 0.080±0.010 inch thick, black panel temperature shall be 113±5.4 °F (45±3 °C) and
the exposure time shall be 100±½ hour. After light aging, the tensile strength and ultimate elongation shall be
determined as specified in 4.6.1.
4.6.7 Flexibility. Specimens shall be low temperature flexibility tested as follows: Specimens shall be cleanly
die-cut to provide sharp edges, free of cracks, tears or abraded particles. Steel die shall be 0.5 inch by 6 inches (12.7
mm by 154.4 mm). Specimens shall not exceed 0.080 inch thickness and shall be uniform to within ±0.010 inch.
Expose the specimens and a 1-inch diameter mandrel for 6 hours at -20±3.6 °F (-29±2 °C) in a cold chamber.
Without removing the specimens from the cold chamber, firmly hold each cooled specimen at one point on the
1-inch diameter mandrel, and using finger pressure, force the specimen around the mandrel within 5±1 second so
that a 180-degree contact is achieved between the specimen and mandrel. The specimen shall not exhibit cracks,
tears, or surface separation from being forced around the mandrel.
4.6.8 Volume change in distilled water (class I only). The volume change after immersion in distilled water
shall be in accordance with ASTM D471 except that the immersion time shall be 24±¼ hour.
4.6.9 Extraction in distilled water (class I only). The percent extraction shall be in accordance with ASTM
D471 using distilled water at boiling point for one hour. The ASTM D471 procedure used shall be "Procedure for
Determining Mass of Soluble Matter Extracted by Liquid" and determining the percent extract by evaporating the
water after specimen removal and weighing the non-volatile residue.
4.6.10 Volume change after immersion in oil (class I only). The volume change shall be in accordance with
ASTM D471 after immersion in ASTM No. 1 oil for 70±½ hour at 212±2 °F (100±1 °C).
4.6.11 Volume change after immersion in Reference Fuel B (class III only). The volume change shall be in
accordance with ASTM D471 after immersion in Reference Fuel B for 168±2 hours at 75±9 °F (24±5 °C).
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