MIL-PRF-13830B
4.2.3.1 Test No. 1. Three out of the first 10 of each type of cemented or bonded
component completed under each contract shall be tested at the high and low
temperatures specified in 3.7.1. If there is reason to doubt quality, the right is
reserved to test additional samples as the inspector deems necessary. Components
subjected to these tests shall have passed all other required tests.
4.2.3.2 Test No. 2. The cemented or bonded components shall be subjected to an
ambient temperature of minus 80 ± 2 degrees F for 5 hours. When inspected visually
at this temperature, and again after remaining five hours at room temperature, the
optical assembly shall show no evidence of "feathering" or reticulation and there shall
be no separation of the components. In performing this test the optical assemblies
shall not be subjected to any undue thermal shocks while being cooled to minus 80
degrees F, or while being warmed to room temperature.
4.2.3.3 Test No. 3. The cemented optical assembly shall then be subjected to the
following test at the high temperature. One of the components shall be held rigidly in
such a manner that the cemented interface shall be approximately in a vertical plane.
A weight of such magnitude as to induce in the optical assembly a unit shear stress
of 5 ounces per square inch of area of the cemented or bonded surface shall be
suspended from the other component. In no case shall the weight be less than one
ounce. The entire apparatus shall be allowed to soak at an ambient temperature of
plus 160 ± 2 degrees F, for 2 hours. The lens shall pass the requirements specified by
4.2.6 when tested at room temperature and the movement or slippage of one
component with respect to the other shall not exceed .002 inch. In performing this
test the optical assemblies shall not be subjected to any undue thermal shocks while
being raised to 160 degrees F or while being cooled to room temperature.
4.2.3.4 Failure investigation. Failure of one optical assembly shall be cause for
stopping shipments pending an investigation of the cause. The contractor shall
institute an immediate investigation in the presence of a representative of the
contracting officer if the representative desires to be present to determine the cause of
failure. If the investigation discloses a fault in cementing or bonding, acceptance of
optical assemblies incorporating this fault shall be stopped pending correction. The
contractor shall correct his cementing technique and shall correct all faulty optical
assemblies previously produced. Acceptance and shipments will be resumed when
ten consecutive optical assemblies of the type rejected have successfully passed the
temperature tests.
4.2.4 Temperature - relative humidity.
4.2.4.1 Sample size. Three out of the first 10 of each type of cemented or bonded
components at the beginning of each contract, or upon change in method of
cementing or change in type cement, shall be tested at the temperature-humidity
conditions specified herein. If there is reason to doubt quality, the right is reserved to
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