This test is performed for evaluating the resistance of component parts and constituent materials to the deteriorative effects of the high-humidity and heat conditions typical of tropical environments. Most tropical degradation results directly or indirectly from absorption of moisture vapor, and from surface wetting. These phenomena produce many types of deterioration, including corrosion of metals; physical distortion and decomposition of organic materials; leaching out of constituent components of materials, and detrimental changes in electrical properties.

Moisture resistance/humidity testing is specified in the following:

MIL-PRF-27, MIL-T-27, MIL-STD-202, MIL-STD-210, MIL-J-641, MIL-STD-750, MIL-STD-781, MIL-STD-810, MIL-I-983, MIL-STD-3885, MIL-S-3928, MIL-E-5272, MIL-E-5400, MIL-T-5422, MIL-C-7951, MIL-T-7743, MIL-P-7788, MIL-F-7872, MIL-M-7969, MIL-A-8064, MIL-K-8144, MIL-E-8189, MIL-R-8236, MIL-C-8384, MIL-E-8595, MIL-M-8609, MIL-F-8615, MIL-S-8805, MIL-M-10399, MIL-C-11015, MIL-R-11539, MIL-C-11693, MIL-I-11804, MIL-R-12574, MIL-C-12889, MIL-R-12934, MIL-R-13312, MIL-C-14409, MIL-C-15024, MIL-C-15305, MIL-F-15733, MIL-E-16400, MIL-T-17275, MIL-T-17301, MIL-P-17840, MIL-F-18327, MIL-T-18404, MIL-R-18546, MIL-F-18870, MIL-M-19097, MIL-E-19100, MIL-N-19900, MIL-R-19648, MIL-S-20708, MIL-C-21097, MIL-T-21200, MIL-D-21625, MIL-W-22248, MIL-S-22432, MIL-I-22943, MIL-B-23071, MIL-C-23200, MIL-B-23306, MIL-D-23615, MIL-L-23886, MIL-C-24095, MIL-L-24223, MIL-C-24308, MIL-P-24423, MIL-T-28800, MIL-E-39029, MIL-H-83511, MIL-S-008834, RTCA/DO-160, ASTM D2247-68, ASTM D822-86, TA-NWT-000487, TA-NWT-000487, ASTM E-644-91, UL-606, GR-487-CORE