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Moisture can cause physical and
chemical deterioration of material to include surface effects such as corrosion,
and biologic growth; changes in material properties due to moisture penetration,
and electrical or mechanical performance effects due to condensation. Typical
problems that can result from exposure to a warm, humid environment include:
-
Swelling
of materials due to moisture absorption.
-
Loss
of physical strength.
-
Changes
in mechanical properties.
-
Degradation
of electrical and thermal properties in insulating materials.
-
Electrical
shorts due to condensation.
-
Binding
of moving parts due to corrosion or fouling of lubricants.
-
Oxidation
and/or galvanic corrosion of metals.
-
Loss
of plasticity.
-
Accelerated
chemical reactions.
The Ranger
Series is tested in accordance with Procedure III - Aggravated. Procedure
III exposes the test item to combined high temperature and humidity levels more
severe than those that occur in documented service scenarios. 10 cycles are
performed - a cycle being 12-hours at 60 C (140° F) and relative humidity of
95%, and 12-hours at 30 C (86° F) with relative humidity of 85%.
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