Downloaded from https://www.everyspec.com .. MIL-STD-81OO’ 19 July 1983 j. Chemical or electrochemical breakdown of organic surface coatings. k. Deterioration of electrical components. 1. Degradation of image transmission through glass or plastic optical elements. m. Absorption of moisture by explosives and propellant. n. Accelerated biological activity. > o. Deterioration of hydroscopic materials. I-3 S FOR ~ TEST ~ a NOTE: This teet method shculd be applied at the end of the tailoring process described in section 4 of this standard. a. Iirah=tkn. This method is used when the teat item ia likely to be deployed in a warm, humid environment.
Such conditions can occur year-round in tropical areaa and seasonally in midlatitude areas. b. kdxkd&m. Now. / c. .@a!w&& (See General Requirements, 4.4.4.) The test procedures of this method are potentially damaging. The place of this method in the eequence of a test itemta life cycle is illustrated in General Requirements, figure 2. The humidity test should follow the initial logistic dynamio exposure of the test item (after arrival at its initial point of disembarkation). It iS generally inappropriate to conduct this test on the same test sample used for salt fog or fungus teeta. d. lest varia.kkc.a.
The most “importantways the test can vary are in duration, temperature-humidity cycles, and ventilation. I-3:1 tice of teSt DrOCedUreW. This method consists of three procedures. a. re I - N~. Procedure I simulates natural environmental cycles and is conducted on test items which are open to the environment or frequently ventilated. b. lrocedure II - LoQu2fA. Procedure II simulates unventilated conditions that may occur during storage or tranait and is appropriate for sealed.iteme or items enclosed in sealed iteme. For the purpose of this test, a sealed item is one that could have a relatively high internal level of humidity and lacks continuous or frequent ventilation.
It does not include hermetically sealed items. The internal humidity may .be cauaed by these or other’mechanisms: . (1) Entrapped, highly humid air. (2) Presence of free water. METHOD 507.2 19 JUIY 1983 507.2-2