MIL-DTL-2439F
3.4.2 Neck ring plating. The ring shall be blanked and plated in accordance with either finish
number 1.9.1.3 or 1.9.2.3 of MIL-STD-171.
3.4.3 Neck ring corrosion resistance. The completed neck rings shall show no corrosion or rust
products of basic metal when subjected to 36 hours of 5% salt fog test.
3.4.4 Polyester tape. For Type I, II and III containers, Polyester tape may be applied to the neck
tube, instead of a neck ring. The polyester tape shall be "Scotch" TM brand Film Tape, Black Y
8459 (0.0025 inch thick) "Scotchpar" tm Heat Shrinkable Film (a product of 3M Company, 3M
Center, St. Paul, MN 55101), or equivalent. The application of the polyester tape, see 6.3, to the
open end of the neck tube shall be accomplished by a heat shrink process.
3.4.5 Neck ring workmanship. The neck ring shall be flush with the outside surface of the tube
and may project above the inside surface of the tube by the thickness of the metal. The ring shall
be crimped in place so that no sharp corners or burrs project. The waterproof layers of paper
shall not be cut by the neck ring when it is crimped in place.
3.5 Inner tubes. Tubes, other than those specified in 3.2, shall be either convolute or spiral
wound. Unless an overlap of the windings is specified, they shall be butted at the edges. Any
gap at the butt joint shall not be greater than 1/16 inch. Inner tubes with greater than ¼ inch wall
thickness may be made of two or more tubes placed one within the other and securely glued
together. Inner tubes shall be glued with an adhesive complying with ASTM D 4317 or MIL-A-
13374. Tubes shall be glued together with and adhesive complying with ASTM D 4317. Inner
tubes shall be made from plain commercial chipboard, suitable for winding and shall have a
clean, uniform surface. The chipboard shall meet the following minimum requirements:
a. Basis Weight - Three pounds per 0.001 inch of thickness per 1,000 square feet
b. Bursting Strength - Two points per 0.001 inch thickness
c. Acidity - pH of 6.5 +/- 1.5
3.6 Container cover. The fiber container cover shall be slide fit on the neck tube. The weighted
cover shall slide free of the neck tube without shaking or vibration within 15 seconds.
3.7 Metal ends, crimped and covers.
3.7.1 Metal for ends. The metal used shall conform to one of the materials 3.7.1.1 or 3.7.1.2.
More than one type material shall not be mixed within a given lot. The thickness shall be the
thickness of the base steel or iron before plating.
3.7.1.1 Tinplate. Tinplate shall be either electrolytic number 100 or hot-dipped Standard Cokes
(or better), in accordance with ASTM A 624/ASTM A 624M or ASTM A 626/ASTM A 626M.
Steel type, temper, finish, and base weigh shall be selected by the fiber container manufacturer to
the values which permit compliance with 3.7.
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