MIL-PRF-24793A
3.4 Composition. The adhesive shall be a one component, liquid, adhesive.
The adhesive shall be capable of being cured by exposure to ultraviolet (UV)
electromagnetic radiation.
3.5 Performance requirements. The performance requirements shall be
defined in terms of the mechanical, environmental, and chemical properties.
3.5.1 Viscosity (see 4.6.1). The uncured adhesive viscosity shall be not
less than 100 cp and not greater than 2,000 cp at +25OC ± 5OC.
3.5.2 Shelf life (see 4.6.2). The uncured adhesive shall have a shelf life
not less than 18 months at +25OC ± 5OC (see 6.6). The 18-month period
commences on the date of the adhesive manufacture. The uncured adhesive shall
meet the requirements of 3.5.1. When cured in accordance with 3.5.4, the
adhesive shall meet the requirements of 3.5.5, 3.5.6, and 3.5.7.
3.5.3 Storage temperature (see 4.6.2). The uncured adhesive shall be
capable of storage at temperatures from -40OC to +50OC. After storage, the
uncured adhesive shall meet the requirements of 3.5.1. When cured in
accordance with 3.5.4, the adhesive shall meet the requirements of 3.5.5,
3.5.6, and 3.5.7.
3.5.4 Cure schedule (see 4.6.3). The adhesive shall meet the requirements
of 3.5.5, 3.5.6, 3.5.7, 3.5.8, 3.5.10, 3.5.11, and 3.5.12 when exposed to UV
radiation (radiant intensity > 0.006 W/cm2) for a time period sufficient to
completely cure the bulk material sample. The adhesive shall meet the
requirements of 3.5.15 when exposed to UV radiation with a radiant intensity
of 0.003 W/cm2 for 2 ± 1 minutes at +25OC ± 5OC.
3.5.5 Linear shrinkage (see 4.6.4). The adhesive shall have a linear
shrinkage of not greater than 2 percent when cured in accordance with 3.5.4.
3.5.6 Hardness (see 4.6.5). When cured in accordance with 3.5.4, the
adhesive shall have a Shore D hardness not less than 65.
3.5.7 Bond strength (see 4.6.6). When cured in accordance with 3.5.4, the
adhesive shall have a bond strength not less than 10.3 MPa (1,500 psi) at a
temperature of +25OC ± 5OC.
3.5.8 Glass transition temperature (see 4.6.7). When cured in accordance
with 3.5.4, the adhesive shall have a glass transition temperature not less
than +65OC.
3.5.9 Index of refraction (see 4.6.8).
The adhesive shall have an index of
refraction not less than 1.500.
3.5.10 Coefficient of linear thermal expansion (see 4.6.9). When cured in
accordance with 3.5.4, the adhesive shall have a coefficient of linear thermal
expansion not greater than 225 x 10-6 mm/OC.
3.5.11 Operating temperature (see 4.6.9). When cured in accordance with
3.5.4 and after exposure to non-operating temperature extremes between -40OC
and +70OC, the adhesive shall meet the requirements of 3.5.10 when exposed to
operating temperature extremes between -28OC and +65OC.
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