MIL-DTL-24487B (SH)
TABLE VII. Classification of defects.
Category
Defects
Critical
None defined
Major
101
Deviation from weight and dimensions specified in 3.4 and 3.5 (see 4.4.1 and 4.4.2)
102
Wax or other substances on the surfaces of the tile which might interfere with
subsequent adhesion
103
Tile not roughened by abrading on surfaces to be bonded (see 3.3)
104
Hardness not within required limits
Minor
201
Cracks, pin holes, or cavities such as bad fill on the surfaces of the tile
202
Foreign material embedded in the rubber
203
Blisters on the surfaces of the rubber component
204
Improper or incomplete identification of the tiles (see 3.8)
4.4.1 Dimensions and Form. Prior to measuring dimensions and form, the sample tile shall be conditioned
at 80 ± 9 degrees Fahrenheit (°F) (27 ± 5 degrees Celsius (°C)) for at least 16 hours. The plan size of the entire tile
and the overall thickness of the tile shall be measured without cutting the tile.
4.4.1.1 Tile plan size. The plan size of the entire tile shall be measured on the cross-grooved face of the
tile with a steel ruler graduated in 1/64 inch units to determine conformance to 3.4.
4.4.1.2 Tile thickness. The thickness of the tiles shall be measured with a nominal 6-inch deep-throat
micrometer, or equal, having 0.001 inch (0.0025 cm) divisions and accurate to 0.001 inch (0.0025 cm) to determine
conformance to 3.4. Each tile shall be measured at four points at least 4 inches (10 cm) apart and at least 1 inch (2.5
cm) from the edge of the tile. Each tile containing a nonconforming measurement shall be considered defective.
4.4.1.3 Form. One tile shall be placed inside a cylinder with a 36 ± 1.0 inches (91.4 ± 2.5 cm) inside
diameter and a minimum length of 12 inches (30.5 cm). The tile surface with the cross-grooved face should be
placed facing the cylinder inside wall. The tile shall easily conform to the curvature of the inner wall of the cylinder
with no wrinkling, buckling or obvious distortions of the tile.
4.4.2 Weight. Sample tiles shall each be weighted to the nearest 0.05 pound (0.023 kilograms (kg)).
Results shall be computed to weight per square foot based on the nominal dimensions for the tile. The weight of
each tile shall conform to the requirement in 3.5.
4.5 Test methods.
4.5.1 Conditioning. Unless otherwise specified in the procedures, all specimens shall be conditioned for at
least 16 hours at 80 ± 9°F (27 ± 5°C) before being tested, and the tests shall be performed within this temperature
range.
4.5.2 Specific gravity. The specific gravity of the rubber shall be determined in accordance with ASTM D
792 using specimens cut from the tiles. A Jolly balance, or equal, may be used in lieu of an analytical balance.
4.5.2.1 Reference value. The specific gravity of specimens cut from the five tiles provided for first article
inspection shall be measured to a tolerance of plus or minus 0.02 unit and averaged to establish a reference value for
conformance inspection.
4.5.2.2 Conformance. The specific gravity shall be determined on specimens cut from the tile which was
randomly-selected for destructive conformance tests. The value obtained shall be compared to the average obtained
in 4.5.2.1 and shall conform to the requirement in 3.2.
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