A-A-50806C
Leakage testing (frozen urine under vacuum conditions). The bottle shall be filled with synthetic urine to the level indicated by the 75 ml graduation mark. A screw cap closure shall be applied hand tight. The synthetic urine filled bottle shall be placed in a freezer chamber with a temperature of at least -40 degrees (F) for the appropriate time period for the liquid synthetic urine content to become completely frozen solid. The bottle with its frozen content shall be removed from the freezer and transferred to a vacuum chamber that operates at room temperature. The vacuum chamber shall be set for a 151 mm Hg vacuumatic pressure. Under the 151 mm Hg vacuumatic pressure condition, the bottle shall be vertically suspended in an inverted position for 1 hour and then positioned in a horizontal position for 1 hour. Any evidence of leakage from the bottle shall be cause for rejection of the bottle. If the bottle has shown no evidence of leakage in both vertical and horizontal positions, the frozen liquid shall be allowed to thaw back to a complete liquid form (with ambient conditions at option of the contractor). The bottle with the thawed liquid contents shall be subjected to an additional leakage testing procedure (see “Leakage testing (frozen/thawed urine under vacuum testing)” hereinafter specified. Sampling for the tests shall be in accordance with MIL-STD-105 and an S-1 inspection level. The unit of product for the leakage tests shall be an individual bottle with screw cap. The acceptance number shall be zero.
Leakage testing (frozen/thawed urine under vacuum testing). The bottle with synthetic urine contents shall be initially subjected to the testing procedure specified in the “Leakage testing (frozen urine under vacuum conditions)” paragraph. After completion of that testing procedure the frozen urine content shall be allowed to become completely thawed and returned to its liquid state. The liquid urine filled bottle shall be placed in the vacuum chamber that is at room temperature. The vacuum chamber shall be set for a 151 mm Hg vacuumatic pressure. Under in the inverted position for 1 hour and then positioned in the bottle shall be cause for rejection of the bottle. The sampling plan and acceptance number shall be as indicated in the previous paragraph.
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