MIL-PRF-24172B (SH)
3.10 Off-gassing. The insulation shall meet the requirements in the Nuclear Powered Submarine
Atmosphere Control Manual, NAVSEA Technical Manual S9510-AB-ATM-010 Rev 2, for a usage category of
Limited (see 4.7 and 6.7).
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a. First article inspection (see 4.2)
b. Conformance inspection (see 4.3)
4.2 First article inspection. Prior to production, first article inspection shall be conducted on a sample to
determine conformance with all the requirements and tests herein. The test material shall be identical in composition and
equivalent in manufacture to the material to be supplied later for conformance inspection. The first article sample shall
comply with all the requirements specified herein.
4.3 Conformance tests (type II only). Conformance tests shall be conducted to determine conformance to all of
the specified tests and requirements of this specification, except fire resistance (4.5.5), toxicity (4.6) and off-gassing
(4.7). Sufficient quantities of foam ingredients shall be taken to produce at least six sample test blocks as specified in
4.5.2. When a temperature range for mixing and foaming the base ingredients is specified (see 4.5.2.2, 6.2 and 6.3) three
test blocks of foam shall be prepared at each specified temperature. Conformance tests are not required for foam
formulations previously supplied under contract which have been tested and found to conform to this specification,
provided that no changes have been made in the test mold (see 4.5.2.1), materials, material production techniques,
formulation, mixing instructions and handling characteristics (see 4.5.2.2, 6.2 and 6.3) in the foam formulation subsequent
to these tests.
4.4 Sampling.
4.4.1 Lot. For purposes of sampling, a lot shall consist of all material from one production batch offered for
delivery at one time.
4.4.2 Sampling for visual dimensional examination (type I only). A random sample of preformed boards shall be
selected from each lot offered for Government inspection in accordance with ASQC Z1.4 at inspection level II. The
acceptable quality leve l (AQL) shall be no defects. Major and minor defects shall be as specified in ASQC Z1.4.
4.4.3 Sampling for quality conformance inspection.
4.4.3.1 Type I only. From each lot (see 4.4.1) sufficient samples shall be prepared from separate boards selected
at random and tested as specified in 4.5.3 through 4.5.14. If any of the samples tested is found to be not in accordance with
this specification, this shall be cause for rejection of the entire lot represented by the sample.
4.4.3.2 Type II only. Two containers of resin shall be selected at random from each lot (see 4.4.1). A 2-quart
sample shall be taken from each of the two containers, placed in separate clean, dry, metal or glass containers and sealed
and marked. Containers from which the samples have been removed shall be re-padded with dry nitrogen and sample
containers shall also be padded with dry nitrogen. In a similar manner samples of curing agent, in quantities proportional to
the resin as designated by the contractor's foaming instructions, shall also be selected, packaged, and marked. Containers
from which the curing agent samples have been removed shall be re-padded with dry nitrogen and sample containers shall
also be padded with dry nitrogen. The selected samples shall be foamed, prepared and then tested as specified in 4.5.3
through 4.5.14.
4.5 Test methods.
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