MIL-PRF-24794A
operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
3.4 Composition. The index matching material shall be chemically stable
over the specified operating and storage temperature ranges.
3.5 Performance requirements. The performance requirements shall be
defined in terms of the mechanical, environmental, and chemical properties.
3.5.1 Appearance (see 4.6.1).
The index matching material shall be clear
and transparent.
3.5.2 Index of refraction (see 4.6.2). The index matching material shall
have an index of refraction of 1.46 ± 0.01.
3.5.3 Shelf life (see 4.6.3). The index matching material shall have a
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shelf life not less than 36 months at 25OC ± 5 C (see 6.6). The 36 month
period commences on the date of the adhesive manufacture. The index matching
material shall meet the requirements of 3.5.1 and 3.5.2.
3.5.4 Storage temperature (see 4.6.3). The index matching material shall
meet the requirements of 3.5.1 and 3.5.2 after storage.
3.5.5 Operating temperature (see 4.6.4). The index matching material shall
meet the requirements of 3.5.1 when exposed to operating temperature extremes
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between -28 C and +85 C.
3.5.6 Flow resistance (see 4.6.5). The index matching material shall not
flow at elevated temperatures. During the flow resistance test, uniform
displacement of the entire index matching material sample (as contrasted with
the flow of material) is not considered a failure.
3.5.7 Water absorption (see 4.6.6).
The index matching material shall meet
the requirements of 3.5.1.
3.5.8 Identification and marking (see 4.6.7). All containers shall be
marked. The markings shall be permanent and clearly visible and legible.
Marking information shall include the Part or Identifying Number (PIN), CAGE
code, manufacturer's name, and date of manufacture.
3.5.9 Workmanship (see 4.6.8). All index matching material shall be
uniform in color and free from dirt, metallic particles, and other foreign
material or any quality defects detrimental to the performance of the
material.
3.5.10 Fungus Resistance (see 4.6.9) When tested in accordance with 4.6.9,
index matching materials shall show sparse or very restricted microbial growth
and reproduction with minor or inhibited substrate utilization. There shall
be little or no chemical, physical, or structural change detectable.
3.6 Shipping. Index matching material shall not be shipped on any order to
this specification if the shipping date is greater than 12 months from the
manufacturing date.
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