MIL-DTL-6070C
3.9 Panel size. Unless otherwise specified (see 6.2), the nominal width and length shall be 48 by 96
inch panels.
3.10 Panel trimming . Trimming for length and width shall be full and true. A tolerance of plus 1/4
inch will be allowed in length and width of panels. Panels exceeding 35 inches in width or 59 inches in
length may be reduced 6 inches in either or both length or width to eliminate defects which may occur on
the
edge of the panels. The number of panels thus altered shall not exceed 5 percent of the total number of
panels of any lot or shipment.
3.11 Surfaces. Plywood shall be smooth, flat, and free from blisters, wrinkles, laps and other defects not
specifically permitted. The surfaces of the finished plywood shall be free from glue, oil, wax, paraffin,
tape, or any other substances that will prevent the adhesion of glue or paint finishes. Spot sanding that
results in no appreciable change in thickness may be permitted with other limitation. Otherwise if panels
are sanded, sanding shall be accomplished on both sides. Sanding shall not reduce the thickness of the
face plies by more than 5 percent of their normal thickness.
3.12 Joints.
3.12.1 Edge joints. Plywood shall have all plies either of one-piece veneer or of two or more pieces,
properly glued on the edges. Joints shall run parallel with the grain of the pieces. Edges of the pieces of
veneer shall be jointed straight and square and shall be glued with a water resistant glue. No metal staples
or tape shall be used. In plies other than the face, open joints will be permitted provided that the opening
in any one joint does not exceed 1/32 inch.
3.12.2 Scarfing. Large plywood panels may be made from two or more smaller panels by scarfing. The
slope of scarfs shall not be greater than 1 in 12. The scarfs shall be glued in a hot-press with thermo-
setting, synthetic-resin adhesives.
3.13 Moisture content. Moisture content of all veneers, which are to form any one panel, shall not
vary more than 3 percent from the minimum to the maximum at the time of gluing. The finished plywood
shall be conditioned to a moisture content of not less than 8 percent nor more than 12 percent.
3.14 Shearing strength . Specimens shall be subjected to shear tests described in section 4. The test
specimens shall not show delamination or separation at the bond lines before testing or during the boiling
period. When the test specimens have an average shear strength of less than 250 psi, they shall show not
less than 30 percent minimum and 60 percent average wood failure. When the test specimens have an
average shear strength ranging from 250 to 400 psi, they will show not less than 15 percent minimum and
30 percent average wood failure. Specimens having shear strength greater than 400 psi, no wood failure
shall be required.
3.15 Exterior type heat durability. When tested as specified in 4.6.5 the plywood shall show no glueline
delamination due to combustion.
3.16 Identification. Each sheet of plywood shall have marked on the face with suitable light-fast,
durable non-bleeding marking fluid, in letters not less than 1/4 inch high with the following data:
Nomenclature
Manufacturers Name
Number of Plies
Panel Thickness
Species of Face
Species of Inner Plies
Contract Number
Federal Stock Number
US
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