MIL-DTL-24688A
4.3.2 Testing of the end item. The end item shall be tested in accordance with 4.3.2.1 through 4.3.2.3.
4.3.2.1 Lot. For purposes of sampling and conformance inspection, a lot shall consist of all insulation material
of the same type, size, and thickness produced under similar conditions and ready for inspection or shipment at one
time. Unless otherwise specified (see 6.2), the lot size shall be expressed in the number of panels or lengths of
preformed pipe insulation.
4.3.2.2 Sampling for conformance testing. The sample unit shall be one panel or one length of preformed pipe
insulation as applicable. Sampling shall be in accordance with MIL-STD-1916, except where otherwise indicated
herein. Conformance tests and examinations are required for all production lots of material.
4.3.2.3 Formulation changes. The addition of any substance that was not present in the qualification sample
requires requalification. Any changes in basic ingredients, manufacturing processes, or manufacturing locations
which would affect compliance with this specification must be reported to both the contracting activity and
NAVSEA. The Government reserves the right to require that all tests specified in this specification be re-performed
on a production lot of material produced under the new formulation, new process, or in a new location before any
shipment is accepted. Any formulation change not disclosed to NAVSEA will result in immediate disqualification
of the product.
4.3.3 Certificate of compliance. When specified (see 6.2), a certificate of compliance shall be prepared.
4.4 Test procedures.
4.4.1 Adhesive. Adhesive testing shall be in accordance with the fire resistance requirements of MIL-A-3316
except that the testing shall be conducted with Type II and Type III insulation materials as applicable (see 3.2.7).
4.4.2 Dimensions and tolerances.
4.4.2.1 Type I and type II. Length, width, thickness, and tolerances shall be determined by ASTM D3574,
Test A (see 3.4.1).
4.4.2.2 Type III.
4.4.2.2.1 Length. Length shall be determined in accordance with ASTM C302 (see 3.4.2.1).
4.4.2.2.2 Size. The inner diameter of the pipe insulation shall be determined in accordance with ASTM C585
(see 3.4.2.2).
4.4.2.2.3 Thickness. Thickness shall be determined in accordance with ASTM C302 (see 3.4.2.3).
4.4.3 Weight and tolerances.
4.4.3.1 Type I and type II. Weight and tolerances shall be determined in accordance with ASTM D3574,
Test A (see 3.5.1).
4.4.3.2 Type III (classes 1 and 2). Density shall be determined in accordance with ASTM C302 (see 3.5.2).
4.4.3.3 Type III (classes 3, 4, 5, and 6). Density shall be determined in accordance with ASTM D3574, Test A
(see 3.5.2).
4.4.4 Facing alignment (type II, classes 1, 2, 3, 4, and 5 and type III). Facing alignment shall be tested by
4.4.5 Paintability (type II, classes 1, 3, 4, and 5 and type III, classes 2, 4, and 6). One coat of latex emulsion
flat primer conforming to MIL-PRF-24596 and one coat of fire-retardant paint conforming to MIL-DTL-24607 shall
be applied to the cloth surface of the Type II panel or the Type III prelagged preformed pipe insulation (see 3.7.1).
4.4.6 Cutability (type II). Panels shall be examined after cutting or sawing to determine conformance to 3.8.
Thread separation shall be determined by direct measurement using a rigid rule with 1/16-inch graduations.
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