MIL-PRF-17927D
4.3.1.3 Sampling for tests. Samples of gasket material shall be selected from each lot for the test as
specified in 4.3.2 at special inspection level S4 in accordance with ASQC Z1.4. Samples of core rubber shall be
furnished with each lot in the form of two sample pieces 6 by 6 inches by 0.080 + 0.010 inch thick and one
sample piece approximately 4 by 3 inches by 0.500 + 0.010 inch thick, or cut from extruded core and supplied as
slabs. The substitute samples shall be of the same material and equivalent core as that used in the lot of finished
material offered for delivery.
4.3.2 Conformance tests. The samples selected for testing as specified in 4.3.1 shall be subjected to the
tests as specified in Table IV. If any of the samples tested fail to meet any of the requirements specified herein, it
shall be cause for rejection of the entire lot.
4.3.3 Examination. Each of the samples taken as specified in 4.3.1.2 shall be examined visually for
workmanship, appearance, dimensions and tolerance. Any reel in the sample containing one or more visual or
dimensional defects shall not be offered for delivery. Noncompliance with any specified requirements or
presence of one or more defects preventing or lessening maximum efficiency shall constitute cause for
rejection.
4.4 Test procedures.
4.4.1 Testing conditions. Unless otherwise specified, the testing conditions shall be in accordance with
the temperature and humidity of conditioning room requirements in accordance with ASTM D 1349.
4.4.2 Core. The rubber core material shall be tested for the requirements of Table III in accordance
with ASTM D 2000.
4.4.3 Adhesion test. The outer layer(s) shall be stripped from the rubber core (and from each other)
without the use of solvents.
4.4.4 Sealing durometer. The sealing durometer shall be determined in accordance with ASTM D
2240. The reading shall be taken on the finished gasket at the point where the knife or striker bar is to contact
the gasket in actual application.
4.4.5 Tensile strength. The tensile strength shall be determined in accordance with ASTM D 412.
4.4.6 Flame and heat resistance. A specimen of the finished gasket shall be held for 15 seconds with
one face across the flame of a Tirrill-type burner. The lower side of the gasket shall be held even with the tip of
the blue cone of the flame. The temperature of the flame, measured with a pyrometer, shall be approximately
1600°F at the tip of the blue cone. If a pyrometer is not available for measuring the temperature, the tip of the
blue cone of the flame shall be not less than 1 inch or more than 1-1/2 inches high. The specimen, when cut
open at the exposed section, shall be examined for conformance to 3.6. In addition, a specimen of the gasket
shall be held over a 1600°F flame, as specified herein for not more than 60 seconds (or until the silicone core
ignites or bursts into flame). The gasket, when removed from the burner flame, shall be examined for
conformance to 3.6.
4.4.7 Toxicity. To determine conformance with the requirements of 3.9, the gaskets shall be evaluated
using the HHA process. Sufficient data to permit a HHA of the product shall be provided by the
manufacturer/distributor to the NAVENVIRHLTHCEN. To obtain current technical information requirements
specified by the NAVENVIRHLTHCEN, see 6.5.
5. PACKAGING
Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or
order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these
personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging
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