MIL-PRF-24792A
3.2 Materials. The cured adhesive material shall not produce toxic,
corrosive, or explosive by-products. For safety of the material, all
materials are subject to a toxicological and formulations review and
inspection by the Government.
3.2.1 Recycled, recovered, or environmentally preferable materials.
Recycled, recovered, or environmentally preferable materials should be used to
the maximum extent possible, provided that the material meets or exceeds the
operational and maintenance requirements and promotes economically
advantageous life cycle costs.
3.3 Composition.
The adhesive shall be a two-component, 100 percent
solid, epoxy adhesive.
3.4 Performance requirements. The performance requirements shall be
defined in terms of the mechanical, environmental, and chemical properties.
3.4.1 Viscosity (see 4.6.1).
Each adhesive component shall have a
viscosity as specified in table I.
TABLE I.
Adhesive viscosity.
Item
Viscosity (cps)1/ at +25 °C
Part A (resin)
1,000 to 10,000
Part B (hardener)
300 to 5,000
1/ Centipoise.
3.4.2 Shelf life (see 4.6.2). The unmixed adhesive components shall
have a shelf life not less than 24 months at +25 °C ± 5 °C (see 6.6). The 24-
month period commences on the date of the adhesive component manufacture. The
unmixed adhesive components shall meet the requirements of 3.4.1. When cured
in accordance with 3.4.5, the adhesive shall meet the requirements of 3.4.7,
3.4.8, 3.4.9, and 3.4.17 (space application only).
3.4.3 Storage temperature (see 4.6.2). The unmixed adhesive shall be
capable of storage at temperatures from -40 °C to +85 °C. After storage, the
unmixed adhesive components shall meet the requirements of 3.4.1. When cured
in accordance with 3.4.5, the adhesive shall meet the requirements of 3.4.7,
3.4.8, and 3.4.9.
3.4.4 Pot life (see 4.6.3). The mixed adhesive shall have a working
life not less than 30 minutes at +25 °C ± 5 °C. Throughout the working life,
the adhesive shall be dispensable through a syringe needle with a 0.91-mm (.04
inch) outer diameter.
3.4.5 Cure schedule (see 4.6.4). The mixed adhesive shall meet the
requirements of 3.4.6, 3.4.7, 3.4.8, 3.4.9, 3.4.11, 3.4.12, 3.4.13, and 3.4.17
(space application only), when cured as specified (see 6.5 and table VIII).
3.4.6 Linear shrinkage (see 4.6.5). When cured in accordance with
3.4.5, the adhesive shall have a linear shrinkage of not greater than
1 percent.
3.4.7 Hardness (see 4.6.6). When cured in accordance with 3.4.5, the
adhesive shall have a Shore D hardness not less than 65.
3.4.8 Bond strength (see 4.6.7). When cured in accordance with 3.4.5,
the adhesive shall have a bond strength not less than 10.3 megapascals (MPa)
(1,500 psi) at a temperature of +25 °C ± 5 °C.
3.4.9
Glass transition temperature (see 4.6.8).
When cured in
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