MIL-PRF-46846D
72-hour exposure, the synthetic rubber shall be allowed to stabilize at normal room temperature
and shall then be subjected to all of the conformance tests specified herein (see 4.4).
4.3.2 Ambient storage. The synthetic rubber shall be placed in a temperature chamber at a
temperature of 40 + 3°C for not less than 336 hours. Upon completion of the 336-hour exposure,
the synthetic rubber shall be allowed to stabilize at normal room temperature and shall then be
subjected to tests for dimensions, as supplied and after heating in accordance with 4.5.3
(see 4.4.1 for sampling).
4.4 Conformance inspection.
4.4.1 Sampling.
4.4.1.1 Nondestructive examinations. Nondestructive examinations shall consist of
examinations for the workmanship requirements of 3.12.
4.4.1.2 Destructive examinations and tests. Unless otherwise specified (see 6.2), samples
for destructive examinations and tests of tubing shall be selected at random from the lot
(see 4.4.2.1). The samples for destructive examinations and tests of molded parts shall be cut
from molded slabs, 6 inches x 6 inches x 0.075 + 0.010 inches, fabricated from the same batch of
material and subjected to the same degree of cross-linking as the molded parts. Destructive
examinations and tests shall consist of examinations and tests for tensile strength, heat shock,
hardness, elastic memory, and the dimensions and tolerance requirements of 3.5 (see 4.5.2
through 4.5.6).
4.4.2 Test methods.
4.4.2.1 Tests for type II through VI, class 1. Unless otherwise specified in table II, tests
shall be performed in accordance with ASTM D2671 to determine tubing properties as required
by 3.6.1. Unless otherwise specified, the specimens shall be full sections of tubing for sizes 0.375
and smaller. For sizes 0.5 and larger, specimens shall be cut in accordance with 'Die D' of
ASTM D412.
4.4.2.2 Tests for type I through VI, class 2. Tests shall be conducted in accordance with
test methods specified in table III to determine properties as required by 3.6.2.
4.4.2.3 Conditioning. Prior to testing, specimens shall be conditioned as specified in
table II or III.
4.4.2.3.1 Designation. The type of conditioning required shall be designated as follows:
Condition A: As received; no special conditioning after shrinking in
accordance with 4.5.3.
Condition E: Temperature conditioning.
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