MIL-STD-186F (MI)
TABLE II. Surface treatments - Continued.
Code No. |
Treatment |
216 217 218 219 220 221 222 223 |
Passivate by immersion for 30 minutes in a hot (48.8° to 54.4°C) aqueous solution containing 20 percent by volume nitric acid (specific gravity 1.42) and 2 percent by weight of sodium dichromate, rinsed in clean hot water and then thoroughly dried (for 200/300/400 series and precipitation hardening corrosion- resistant steels). Vacuum Pressure or Vacuum Soak Treatment. The clean, dry, well-seasoned wood, freed of bark, shall be surfaced to the correct cross-sectional dimensions and then treated by vacuum and pressure, or vacuum and soak. The treating material shall conform to Composition C of TT-W-572. Retention on treatment shall be not less than 0.3 pounds per cubic foot. The temperature of the preservative during the treating process is to be at the discretion of the contractor, so long as the requirements of AWPA-P3 as to penetration and the above retention requirements are met. Immersion treatment. Dress the wood part to correct cross- sectional dimensions. Immerse in composition C of TT-W-572 for not less than 4 hours. Allow the treated wood to air-dry or kiln-dry before it is painted. Surface treatment. Dress the wood part to correct cross- sectional dimensions. Apply one liberal coat of zinc naphthenate reduced with water down to 3 percent zinc metal. Where practical, apply the solution by immersion for not less than 3 minutes. Otherwise, brushing or low pressure spraying (no atomization) is acceptable. Allow the treated wood to air-dry or kiln-dry before it is painted. (No longer used.) (No longer used.) Treatment, mildew-resistant, noncopper process for cotton duck, webbing, and sewed items (CCC-D-950). Class to be designated on drawing immediately following code number. Treatment, insect-resistant for paper |
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