MIL-DTL-3100H
6.6 Comparative data. Historically, elastomer material property values were required to
be determined on first article samples as specified in 6.6.1, 6.6.1.1 and 6.6.2, and furnished to the
Government as comparative data. After first article approval was granted, these values were
maintained during subsequent production as evidence of constancy of materials, formula, and
manufacturing processes. This comparative data was used by the Government in quality control
evaluation of production items furnished subsequent to first article approval.
6.6.1 Elastomer compounds. The contractor should furnish comparative data as specified
in table V, in accordance with applicable ASTM methods.
Table V. Comparative data elastomer physical and mechanical properties.
Hardness (durometer Shore A or IHRD)
Specific gravity (per ASTM D945 or D575)
(per ASTM D1415 or D2240)
Tear strength (per ASTM D624)
Tensile strength (per ASTM D412)
Load compression & recovery (per ASTM D573)
Elongation (per ASTM D792)
Low temperature flexibility (per ASTM D2137)
Tensile stress (modulus)
Accelerated aging characteristics
(per ASTM D2137)
(per ASTM D573)
6.6.1.1 Tolerances. Property values should be maintained as specified in table VI.
Table VI. Tolerances.
Physical and mechanical properties
Tolerances
Hardness (durometer Shore A or IHRD) ± 5
Tensile strength value (TSV)
± 10
% (before aging)
% (after aging)
-10 from aged TSV to +10 of before aged TSV
± 17
Elongation, % (before and after aging)
± 17
Tensile stress, %
± 0.015
Specific gravity
Tear strength, %
- 15 (minimum only)
± 10
Load compression and recovery, %
6.6.2 Infrared absorption. The contractor should also furnish infrared absorption
spectrum recordings, taken prior to each endurance test, from specimens granted first article
approval. A chart showing the attenuated total reflectance spectrum for a range from
approximately 2.5 to 15 microns wave length, as a function of absorbance, should be prepared by
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