MIL-DTL-2439F
Where: W1 = Weight (in grams) before resin impregnation.
W2 = Weight (in grams) after resin impregnation.
If any sample fails to meet the 12% by weight minimum, the impregnation procedure shall be
adjusted and the test repeated. During production, after every four hours and during the last hour
of production, if applicable, two samples shall be inspected as described above. If any sample
fails to meet the required resin content, that portion of production since the last control check
shall be removed from the lot.
4.5.10.2 Resin cure time. In establishing a cure time, check weigh ten parts, outer, cover, or
neck tubes, after resin impregnation at periodic intervals, since resin impregnation and continue
until weighing stability is achieved.
4.5.11 Wax. As an aid in the manufacturing process, fully refined paraffin wax, with melting
point between 123 to 150 degrees F, may be used to facilitate release of tubes from the forming
mandrel. Build-up of wax particles, flaking, caking shall be inspected visually. Presence will be
cause for rejection.
4.5.12 Gloss of coated container exterior. The exterior of finished containers shall be tested for
specular gloss at 60 degree geometry in accordance with ASTM D 523. Gloss reading shall not
exceed the maximum stated in the requirement.
4.5.13 Blister detection. The fiber container with cover removed, shall be dried in a circulating
oven for a period of 8 +/- ½ hours, at a temperature of 120 +/-5 F degrees. Following this
procedure, visual determination shall be made for indications of blistering. Any presence of
blistering shall be cause for rejection. This is applicable to Types I, II, and III containers.
4.5.14 Assembly.
4.5.14.1 Drop test. The container shall be held vertically with the low end four feet from a
concrete or steel surface, released and allowed to fall freely. Repeat the operation having the
opposite end contact the surface. Observation shall be made for loose or misplaced parts,
dislodgement of the spacer caused by separation of chipboard fibers rather than by separation of
the adhesive bond between the spacer and the metal end shall not be cause for rejection.
4.5.14.2 Tubes (except outer and cover). Cut a finished tube square to the central axis. Any
inner, support, or neck tube used in construction shall have its position and contact with the outer
or cover tube verified from the cross section. If position and tolerance do not meet the
requirements it shall be cause for rejection.
4.5.15 Workmanship. General workmanship of the item shall be verified by visual inspection on
finished items. Evidence of poor workmanship shall be subject to rejection of the individual unit
and withholding acceptance of lot for disposition.
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