MIL-DTL-6070C
3.4.3.3 Mild compression wood. Streaks of mild forms of compression wood in face plies shall not
aggregate more than 10 percent of the width of the panel and shall in no case be wider than 1/2 inch.
3.4.4 Defect in inner plies and back . The following defects, in addition to those permitted in the face,
are acceptable in the inner plies and back.
3.4.4.1 Knot holes. No single knot hole shall exceed 3/8 inch in average diameter. The total number of
knot holes shall be not more than six in any 12 inch square and the sum of the diameters in any 12 inch
square shall not exceed 3/4 inch.
3.4.4.2 Insect holes. No single hole shall exceed 2 inches in length along the grain, 1/8 inch diameter,
nor cut across the grain more than 3/8 inch. The total number of insect holes shall be no more than six in
any 12 inch square and the sum of the lengths across the grain shall not exceed 3/4 inch.
3.4.4.3 Pitch pockets and bark pockets. The Product of the length and width of any pitch or bark pocket
shall be not more than one fourth square inch. The total number of pitch or bark pockets in any 12 inch
square shall be not more than six, and the sum of the pockets shall not exceed one half inch. Pockets shall
be not be closer than 24 inches on the same or adjacent grain lines.
3.4.4.4 Splits. Splits shall be no more than 1/32 inch in width and shall not occur more frequently than
twice in any 12 inches measured perpendicular to the grain of the ply in question. The length of a split in
any ply shall not exceed ten percent of the distance between the edges of a panel as measured along a line
parallel to the grain of that ply and passing through the split.
3.5 Straightness of grain . In at least 90% of the area of each sheet of veneer, the slope of the grain from
the edge of the sheet shall not be greater than 1 in 10. When both spiral and diagonal grain are present,
the combined slope shall be determined by taking the square root of the sum of the squares of the slopes of
the two types of cross grains. When the slope of the grain cannot be determined using the methods
specified herein, the veneer shall withstand mandrel bending tests, described in paragraph 4.6, at ratios of
radius of curvature to thickness as specified in Table IV with breakage of not more than 20 percent of the
specimens.
3.6 Thickness tolerance.
3.6.1 Veneer thickness. The allowable tolerances for veneer are given in Table II. The thickness of any
sheet shall be considered as the average of ten or more measurements taken on the sheet.
3.6.2 Plywood Thickness. The allowable thickness and tolerances for plywood are given in Table III.
The thickness of any sheet shall be considered as the average of ten or more measurements taken on the
sheet.
3.7 Thickness. Unless otherwise specified (see 6.2), the thickness of individual plies, the number of
plies, and the thickness of the plywood shall be as stated in Table III. All veneer of any one layer shall be
of the same thickness.
3.8 Construction. All plies except the core of the center ply shall occur in pairs, be of the same species,
thickness and direction of grain, and on opposite sides of the core, to give symmetrical construction.
Except as otherwise specified, in Table III footnote 2, all inner plies shall be of one species. In all panels
of nine plies or more the two outside plies on each side shall be of the same species and of the thickness
specified in Table III. Unless otherwise specified (see 6.2), the grain of all plies shall be at right angles to
the grain of adjacent plies and to the edges of the plywood.
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