MIL-DTL-45449C
4.4 Methods of inspection.
4.4.1 Moisture content. Moisture content of lumber for Grade A and Grade B pallets shall
be determined in accordance with ASTM-D4442. Moisture content shall be as specified in 3.4.
4.4.2 Moisture content sampling. A sample of 15 pallets shall be selected at random and
subjected to this test. If one or two pallets fail to comply with the requirement of 3.4, the lot shall
be considered eligible for retest as per 4.4.3. If three or more pallets fail to comply with the
applicable requirement the lot shall be rejected.
4.4.3 Retest. A sample of 15 additional pallets shall be selected and subjected to the test
specified in 4.4.1. Failure of one or more pallets to comply with the applicable requirement shall
be cause for rejection of the lot.
4.5 Test of Linderman-jointed pieces in Grade A pallets. Three samples shall be cut
from each of five pallets chosen at random from each lot of pallets. Two of the three samples
shall be cut from the cover assembly and one from the base assembly. The samples shall be 2
inches, +/- 1/8 inch wide (parallel to the grain direction) by a length (perpendicular to the grain
direction) equal to the width of the piece. Any sample that contains a nail hole or a visible split,
shake or check across the entire width shall be discarded and a new sample shall be chosen to
replace it. Samples shall be picked so that the joint to be tested is at least 2 5/8 inches from the
edge of the board. Additional pallets shall be taken if necessary to secure fifteen satisfactory
samples. Any break that is wholly or partially at the joint shall be observed as joint failures. In
order for the lot of pallets to pass this test, at least twelve in the Linderman-joint samples shall
not break at the joints.
4.5.1 Linderman joint sampling. Samples selected as specified in 4.4.2 shall be tested as
cantilever beams as shown in Figure 5. The length of the sample shall be placed perpendicular to
the top edge of the vise. The size of the block and the position to the cleat shall be selected so
that the lever is parallel to the sample. The lever shall be at least 30 inches long. The sample
shall be positioned vertically so that the center of the joint is 0.4 times the clear span, L, above
the top face of the vise. A slow, even pull shall be applied to the top of the level until the sample
yields in bending. The position of the break with respect to the joint shall be recorded to
determine compliance with 3.7.
4.5.2 Urea resin glue. Testing shall be conducted in accordance with ASTM D4690, in
order to satisfy shelf-life and pH level requirements. (See 6.14)
4.6 Presence of wood preservative. A sample of 15 Grade A pallets shall be selected
at random for this test. Four members (two cover assemblies and two base assemblies) of the
pallets selected shall be subjected to the test specified in 4.6.1, 4.6.2 or 4.6.3 as applicable. If one
or more members fail to meet the applicable requirement, the pallet shall be classed defective.
Failure of any pallet to comply with the requirement shall be cause for rejection of the lot.
4.6.1 Presence of PQ56 (copper-8-quinolinolate) preservative. Time of immersion shall
be observed when treated with PQ56, the pallet shall show evidence of discoloration. (See 6.14)
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