MIL-DTL-2439F
4.5.4 Inner tube material (first article inspection only).
4.5.4.1 Basis weight. The inner tube material shall be tested in accordance with ASTM D 646.
The basis weight results shall be recorded in pounds.
4.5.4.2 Bursting strength. The inner tube material shall be tested in accordance with
ISO 2758:2001. (note: TAPPI 403 is acceptable commercial standard alternative, if test
procedures are already in place.)
4.5.4.3 Acidity, pH. The inner tube material shall be tested for acidity in accordance with
ASTM D 548.
4.5.4.4 Construction. Adhesive used shall be shown to comply with ASTM D 4317 or MIL-A-
13374 (see 6.2.h). Physical construction details shall be verified visually with the aid of gages.
Any deviation from the required construction guidelines or adhesive will be cause for rejection.
4.5.5 Container cover. The container shall be placed in a vertical position, cover end down, and
supported at the base. The cover shall be positioned such that the open end of the cover is just
below the neck perforations. The cover shall then be released. If the cover remains in place
when released, it shall be removed; a 3 pound weight shall be placed therein and then be replaced
on the neck tube as far as the perforations. Time to disengagement of the cover from the neck
shall be observed. The sample shall be rejected if the cover does not disengage within the
required time frame.
4.5.6 Metal ends.
4.5.6.1 Material for metal ends. Material used in the construction of the metal ends shall be in
compliance with ASTM A 624/ASTM A 624M or ASTM A 626/ASTM A 626M for tinplated
steel, or ASTM A 653/ASTM A 653M for zinc-coated steel (See 6.2.h).
4.5.6.2 Crimping. A cross section of a finished item shall be created by cutting the sample with a
knife or other sharp instrument. Crimps crimp shall be verified to Figure 12 for Class 1 crimps
and Figure 13 for Class 2 crimp, based on inside diameter of fiber container outer cover. Crimps
found not to comply with Figures 12 and 13 shall be cause for rejection.
4.5.6.3 Metal end pull test. This test shall be performed on the metal ends of the cover and the
body assembly. The assembly shall be prepared for the test by cutting the body tube 5 to 6
inches from the end and extracting all component parts, where necessary, from the cover or
truncated body assembly without injury to the crimp of the metal end of the tube. The prepared
cover and body assemblies shall then be assembled in an approved fixture similar to that shown
in Figure 11. The test may be performed in a tensile testing machine or as static testing.
Determine the load required to separate the metal end from the tube by applying the load parallel
to the centerline of the specimen. When a tensile testing machine is used, the rate of travel of the
head shall be 0.25 +/- 0.05 inches per minute.
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