A-A-52520 Hardwood; Floorboards And Platforms: For Military Vehicles (Metric)This CID covers hardwood floorboards and platforms fabricated for military vehicles.

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A-A-52520B

2.2 Moisture content. Unless otherwise specified (see 6.2) material used shall be air dried or kiln dried to a maximum moisture content of 15 percent or less at time of treatment. This shall be verified when tested to ASTM D4444.

2.3 Preservative treatment. Treatment shall be accomplished after all cutting, machining, or trimming has been accomplished. At the time of treatment, the moisture content shall be in accordance with the requirements noted in 2.2. Hardwood preservative treatment shall be a pressure treatment of light solvent solution of copper naphthenate, to a net minimum retention of 0.64 kilograms per cubic meter (kg/m3) [0.040 pound per cubic foot (pcf)] of copper as measured by gauge or assay method for the zone of 0 to 15 millimeters (mm) (0 to 0.6 inch). The copper naphthenate used in the treating solution shall comply with AWPA P8. The solution shall contain 1 percent copper but not less than 34 grams of copper per gallon at 16 degrees Celsius (°C) [60 degrees Fahrenheit (°F)]. Hardwood preservative treatment shall be monitored, tested, and checked using the appropriate procedures of AWPA C2.

a. For white oak hardwood, treatment to refusal is allowable (see 6.3). The pressure and treatment during the pressure period shall be maintained constant or increased within a range consistence for the material being treated until the quantity of preservative during each of two consecutive half-hour periods is more than 2 percent of the amount already injected.

b. For hardwood species an alternate non-pressure treatment is acceptable, if a high solvent solution of copper naphthenate is used, with a minimum net retention of 0.64