MIL-PRF-24792A
4.6.5 Linear shrinkage (see 3.4.6).
The adhesive shall be tested in
accordance with ASTM D2566 or equivalent.
4.6.6 Hardness (see 3.4.7). A 24-gram slab of cured adhesive shall be
tested in accordance with ASTM D2240.
4.6.7 Bond strength (see 3.4.8). The cured adhesive shall be tested in
accordance with ASTM D1002, using acid etched aluminum bars (QQ-A-250/4).
4.6.8 Glass transition temperature (see 3.4.9). The cured adhesive
shall be tested in accordance with ASTM D3418, using a Differential Scanning
Calorimeter or equivalent.
4.6.9 Index of refraction (see 3.4.10).
The adhesive shall be tested
in accordance with ASTM D542 or equivalent.
4.6.10 Coefficient of linear thermal expansion (see 3.4.11 and 3.4.12).
The cured adhesive shall initially be soaked at both -40 °C and +85 °C for one
hour each. The cured adhesive shall then be tested in accordance with ASTM
D696 or equivalent. The test shall be performed at 11 equally spaced
temperatures spanning the operating temperature range specified in 3.4.12.
4.6.11 Water absorption (see 3.4.13). The cured adhesive shall be
tested for 24 hours in accordance with ASTM D570 or equivalent.
4.6.12 Identification and marking (see 3.4.14). The adhesive
containers shall be visually examined for conformance with the requirements of
3.4.14.
4.6.13 Workmanship (see 3.4.15). The adhesive components shall be
visually examined for conformance with the requirements of 3.4.15.
4.6.14 Connector compatibility (see 3.4.16). The adhesive components
shall be mixed and used in the assembly of a 62.5/125/900-µm optical fiber
into a TIA/EIA-604-2 compliant fiber optic connector, utilizing a zirconia
ferrule. The connector shall be assembled in accordance with the
manufacturer's instructions, except that the adhesive shall be cured in
accordance with 3.4.5, and the connector shall not be crimped to the 900-µm
fiber. NOTE: Finely polished connector end faces will allow more accurate
fiber position measurements (see 4.6.14.1 and 4.6.14.3). The connector
assembly shall be exposed to the tests specified in 4.6.14.1 through 4.6.14.3,
in the order listed.
4.6.14.1 Thermal shock. The connector assembly shall be tested in
accordance with TIA/EIA-455-71, using test condition C-0. The low and high
temperatures shall be -40 °C and +85 °C, respectively. Before the test, the
connector assembly shall be examined for fiber position, using a profilometer
or an optical interferometer.
4.6.14.2 Temperature/humidity cycling. The connector assembly shall be
tested in accordance with TIA/EIA-455-5, method B. The subcycle shall be
included in the test.
4.6.14.3 Fiber pull out. The connector assembly shall be tested by
applying a tensile force of 14.0 N (3.1 pounds) on the 900-µm fiber for one
minute. After the test, the connector assembly shall be examined for fiber
position, using a profilometer or an optical interferometer.
4.6.15 Outgassing (see 3.4.17).
The cured adhesive shall be tested in
accordance with ASTM E595.
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