MIL-DTL-83397B
4.5.2 Compression set.. Compression set shall be determined In accordance with Method B
of ASTM D395, except that the aging time and temperature shall be in accordance with Table I.
Compression set tests shall be conducted on test specimens plied up from applicable test
samples or parts.
4.5.3 Heat aging. Heat aging shall be conducted in accordance with ASTM D573, except
that the aging time and temperature shall be in accordance with Table I, tensile strength,
elongation, and hardness changes shall be determined as specified (see 4.5.1).
4.5.4 Humidity resistance.
4.5.4.1 Long term. Five ASTM D412 die C shall be suspended in a humidity chamber which
maintains 95 ± 5 percent relative humidity at 160 ± 2F (71 ± 1C) for 120 days. After 120 days
the specimens shall be removed, and cooled for 4 hours at 77 ± 2F (25 ± 1C) and 50 ± 5
percent relative humidity prior to test.
4.5.4.2 Short term. Humidity resistance shall be conducted by suspending three ASTM D412,
die C specimens in a quart jar containing approximately 150 cc. distilled water. The screw cap
closed jar shall be placed in an air oven for the time and temperature specified in Table I. Distilled
water shall be added as required to maintain approximately 150 cc in the jar. After exposure, the
specimens shall be cooled for 4 hours at 77 ± 2F (25 ± 1C) and 50 ± 5 percent relative humidity
prior to the tensile strength test.
4.5.5 Ultraviolet resistance. Exposure shall be in accordance with Method 5660 of FED-
STD-191. Tensile specimen; shall be suspended in the apparatus for 100 hours. After exposure
the specimens shall be held at standard conditions (see 4.4.1) for a minimum of 2 hours prior to
test.
5. PACKAGING
5.1 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 requirements are maintained by the Inventory
Control Point's packaging activities within the Military Service or Defense Agency, or within the
military service's system commands. Packaging data retrieval is available from the managing
Military Department's or Defense Agency's automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but
is not mandatory.)
6.1 Intended use. The rubber covered by this specification is intended for use where
resistance to tear and abrasion is required. This material has excellent resistance to humidity.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
b.
Class, hardness (see 1.2).
c.
Dimensions and tolerances (see 3.3)
d.
If first article samples are required (see 3.1).
e.
Packaging requirements (see 5.1).
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