Field Test of Irreversible Humidity Indicator.
Final rept. Apr 82-Dec 83,
AIR FORCE PACKAGING EVALUATION AGENCY WRIGHT-PATTERSON AFB OH
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The objective of this report was to determine the effectiveness of irreversible relative humidity RH indicators in the storage environment of DOD organizations throughout the Continental United States CONUS. Twelve DOD organizations participated in a twelve month field test of irreversible RH indicators which were installed in a various types of containers with a variety of items. The indicator, which turns to a dark orangebrown color after exposure at 55 RH, will not reverse even in a dry environment as do the blue low RHpink high RH reversible types. The reversible type can be affected by temperaturesunlight without an actual change in humidity. The test revealed that the indicator will provide a positive and permanent indication of early stage moisture intrusion before corrosion takes place. Additionally, the test revealed that 12 of test containers with actual stored items indicated a RH above 55 even though the bluepink reversible reference elements indicated RH levels below 50.
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