MIL-DTL-19379C(SH)
4.4 Verification tests. Unless otherwise specified in a particular test procedure, all tests shall be conducted at
an ambient temperature of 80±10 °F. Within this range, the temperature from the beginning to the end of any one
test shall not vary more than ±5 °F.
4.4.1 Rubber, test methods.
4.4.1.1 Tensile strength and ultimate elongation tests. The tensile strength and ultimate elongation shall be
measured in accordance with ASTM D412, Method A, using three Die C test specimens. Refer to table III or
table VII for specimen description.
4.4.1.2 Compression set after oven aging. Compression set shall be determined on three rubber test specimens
in accordance with ASTM D395, Method B, except oven aging conditions shall be as specified in 4.4.1.7. Rubber
specimens with a hardness less than or equal to 44 durometer shall be compressed 40 percent. Rubber specimens
with a hardness greater than or equal to 45 durometer shall be compressed 30 percent. Refer to table III or table VII
for specimen description.
4.4.1.3 Cold compression set. Low temperature compression set shall be determined in accordance with
ASTM D1229 on two rubber specimens, except compression shall be 40 percent and exposure shall be 30±2 °F for
94±½ hours. Two tests agreeing within 5 percent of each other shall be conducted and averaged to determine
4.4.1.4 Hardness. The hardness of the ½-inch thick elastomer specimens shall be determined in accordance
with ASTM D2240 with a Type A Shore durometer. A 3-second reading shall be taken to determine hardness.
4.4.1.5 Volume change in oil. Volume change in oil shall be determined in accordance with ASTM D471,
except the three specimens shall be immersed for a period of 70±¼ hours at 158±2 °F. The specimen shall be
immersed in reference oil IRM 903 of ASTM D471. Refer to table III for specimen size.
4.4.1.6 Adhesion to metal tests. The adhesion tests shall be in accordance with Method A of ASTM D429.
Three specimens of the rubber compound bonded to metal shall be tested and results averaged to determine
compliance with 3.4.2.2. Specimens shall have the same surface preparation, adhesive system, metal type, and
bonding method as used in the finished mount. Refer to table III for specimen description.
4.4.1.7 Oven aging test. Specimens for tensile, ultimate elongation, and compression set after oven aging shall
be oven-aged in accordance with ASTM D573 at a temperature of 194±2 °F for 46±¼ hours. Final determination of
aged tensile strengths and ultimate elongations shall be made not less than 16 hours, or more than 48 hours, after
removal from the oven. Tensile strength and ultimate elongation tests on unaged specimens shall be made
immediately prior to, and on the same machine as, oven-aged specimens.
4.4.1.8 Specific gravity. The specific gravity shall be determined in accordance with ASTM D792 on samples
cut from the specimen sheets. Specimen sheets are referred to in table III and table VII. The average of three
measurements shall be used to determine compliance with 3.4.2.2.
4.4.2 Finished mount, test methods.
4.4.2.1 Dynamic stiffness measurement.
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