MIL-PRF-2819H
4.3.1 Lot. For purposes of sampling and conformance inspection, a lot shall consist of all block insulation of
the same class produced under similar conditions and ready for inspection or shipment at one time. The lot size
shall be the number of thermal insulation blocks in a lot.
4.3.2 Sampling for conformance inspection. As a minimum, a sample quantity of insulation blocks shall be
selected from each lot as specified in table IV, except as specified below, and the sample blocks shall be subjected to
the examinations and tests specified in table III (see 4.4.15). Sample size for the linear shrinkage and weight loss by
tumbling tests shall be in accordance with table IV except for lot sizes greater than 50, in which case the sample size
shall be three for each lot. Conformance tests and examinations are required for all production lots of material.
TABLE IV. Sampling for conformance inspection.
Lot size
Sample size
2 to 25
1
26 to 50
2
51 to 90
4
91 to 150
7
151 to 280
10
281 to 500
11
501 to 1200
15
1,201 to 3,200
18
3,201 to 10,000
22
10,001 and over
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4.3.3 Formulation changes. Any changes in formulation, ingredients, manufacturing processes, or
manufacturing locations shall be approved by NAVSEA.
4.3.4 Certificate of compliance. When specified (see 6.2), a certificate of compliance shall be prepared.
4.4 Test methods.
4.4.1 Conditioning of samples. Test specimens shall be conditioned by drying to a constant weight in an oven
at a temperature of 215 to 250 °F preceding a test.
4.4.2 Dimensions. Length, width, and thickness shall be measured in accordance with ASTM C303 (see 3.3.1).
4.4.3 Appearance and workmanship. The insulation block shall be examined to determine that none of the
following defects exist (see 3.8):
a.
Cracked or broken blocks.
b.
Edges not plane.
c.
Excessive voids.
d.
Warping.
e.
Form not as required.
4.4.4 Density. The density shall be determined in accordance with ASTM C303.
4.4.5 Compressive strength. The compressive strength shall be determined in accordance with ASTM C165.
4.4.6 Weight loss by tumbling. Weight loss by tumbling shall be determined in accordance with ASTM C421.
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