MIL-DTL-2439F
4.5.6.4 Coating thickness. The metal ends shall be tested in accordance with ASTM E 376 (69,
Part 31). If coating thickness is found to be unacceptable for the requirement, it shall be cause
for rejection.
4.5.6.5 Gloss of coated metal ends. The coated metal ends 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.
4.5.6.6 Salt spray of coated metal ends. The coated metal ends shall be tested as specified in the
MIL-E-19603, except that the specimens are not required to be bent.
4.5.7 Chipboard spacers. Analysis shall be done to verify conformance with stated requirement
(see 6.2.h).
4.5.8 Peel strength of polyester tape. Store container assemblies without cover tubes at ambient
temperature and humidity for three hours, minimum. Upon completion of the conditioning, the
tape shall be separated by a sharp object or other suitable means from the surface of the neck
tube. The separation will be sufficient in length to permit fingertip grasping of the tape. Peel the
tape perpendicular to the neck tube at an even rate of peel of approximately 1 inch, every five
seconds. Examine for evidence of fiber failure of the surface of the outer kraft or polyethylene
ply to the tape.
4.5.9 Peel strength of outer layer. Prior to being subjected to this test, the test coupons shall be
conditioned to the following requirements. Storage at ambient room temperature and humidity
for a period of three hours, minimum. Upon completion of conditioning, the outer layer of
asphalt impregnated kraft paper(Type I and II containers) or the outer layer of polyethylene
(Type V containers) shall be separated from the adjacent layer of aluminum foil by a sharp object
or other suitable means. The separation shall be sufficient in length to permit fingertip grasping
of the layers. The separated layer will be peeled at a 180 degree angle and at an even rate of peel
of one inch approximately every five seconds. Examine for evidence of fiber failure of the
surface of asphalt impregnated kraft paper to the layer of aluminum foil.
4.5.10 Resin content; process control of resin impregnated procedure. Applicable to Type IV
containers.
4.5.10.1 Batch process. After a cure time for the parts, outer, cover or neck tubes, has been
established, five samples shall be inspected to qualify the resin impregnation procedure at the
beginning of production. The non-impregnated samples shall be tared and labeled. Then, they
shall be immersed in heated resin at 200 F to 225 F for three minutes, minimum. After the
samples have been cured, they shall be weighed again and the resin content shall be calculated as
follows:
Resin content: % = (W2-W1) X 100
W2
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