MIL-PRF-23653D
4.3.1 Identification of lot. For purposes of sampling, examinations, and tests for conformance, a lot shall
consist of all the tiles, not exceeding 500 square feet of material, produced in one plant under essentially the same
conditions, and offered for delivery at one time.
4.3.2 Sampling for conformance inspection. For the examination and tests specified in 4.3.3 and 4.3.4, 10 tiles
shall be selected at random from each lot of tiles furnished under the contract or order.
4.3.3 Examination. Each of the tiles selected in accordance with 4.2.1 and 4.3.2, as appropriate, shall be
examined for identification marking and visual defects and workmanship.
4.3.3.1 Rejection. If any of the 10 tiles in the sample are found not to be in conformance with the requirements
of this specification, an additional set of 10 tiles shall be taken from the lot of tiles. If any of the 10 tiles in the
second sampling are found not to be in conformance with the requirements of this specification, this shall be cause
for rejection of the entire lot.
4.3.4 Conformance tests. Each of the tiles selected in accordance with 4.3.2 shall be tested to determine
conformance to the following requirements:
Paragraph
Requirement
Weight
Dimensions
Hardness
Permanent compressibility (Class 1 only)
4.3.4.1 Rejection. If any of the tiles representing a lot are found not to be in conformance with the
requirements of this specification, this shall be cause for rejection of the entire lot represented by the tile.
4.3.5 Recertification. To maintain qualification, each class of damping tile shall be tested for conformance to
3.8.1 every three years and to 3.2.1 and 3.8.1 each time there is a change in formulation or tile manufacturing is
moved to a location or plant other than the location or plant at which the tiles tested for qualification were
manufactured. The formulation shall be considered to have changed if there is an introduction or elimination of an
ingredient, a replacement or change of an ingredient, a change in the source of supply of an ingredient, or the
replacement of an ingredient with an equivalent ingredient from the same manufacturer. Results shall be submitted
for evaluation and approval for use as specified (see 6.4).
4.4 Test methods.
4.4.1 Weight. The weight of each of the 10 tiles in the sampling shall be measured to the nearest 0.01 pound
and the 10 results averaged.
4.4.2 Dimensions. Each of the 10 tiles shall be conditioned at 80±9 °F (27±5 °C) for not less than 16 hours.
The dimensions of each of the tiles shall be measured at 80±9 °F (27±5 °C) by the following procedure. The tile
shall be laid on a flat surface and measured for length and width with a steel ruler graduated in 1/64-inch units. The
thickness of the tile shall be measured with a nominal 6-inch deep-throat micrometer, or equal, at not less than six
points distributed over the area of the tile and at least 1 inch (2.5 cm) from the edge of the tile. The average of the
six or more thickness readings shall be computed and considered to be the thickness of the tile.
4.4.3 Flame retardance. Flame retardance shall be determined in accordance with ASTM D635 except that no
wire gauze shall be mounted beneath the specimen and only three specimens cut from the same tile shall be tested.
Each of the three specimens shall be rated at least self-extinguishing. If any of the specimens are not at least
self-extinguishing, the procedure in the ASTM method which specifies tests in groups of 10 specimens (cut from the
same tile) shall be followed.
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