managing moisture Archives - Sierra Cases

Choosing the Right Humidity Indicator

Sierra Cases — Wed, 09 Oct 2013 20:44:58 +0000

In the desert, relative humidity levels may be as low as 5%. In the tropics, 100% is possible. Anything over 40% is generally considered humid. Humidity causes metal to corrode and mold to form. Lower humidity is a problem too, as drops in temperature cause condensation. If that happens inside a transit case or shipping […]

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An Introduction to Humidity Indicators

Sierra Cases — Wed, 25 Sep 2013 21:19:36 +0000

Humidity causes mold and corrosion. Add in temperature changes, condensation can be a problem, too. A desiccant placed in an enclosure adsorbs moisture for a while, but eventually it loses effectiveness and needs replacing. Knowing the level of humidity in a transit case or shipping container, action can be taken before damage occurs. Color-Changing Cobalt chloride […]

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How Desiccants Manage Moisture in a Transit Case

Sierra Cases — Wed, 11 Sep 2013 17:40:49 +0000

You can't prevent moisture from entering an enclosure. It's in the sealed-in air. It's in the enclosed materials. It even permeates through the walls and seals of the enclosure. And, when a transit case is equipped with a breather for pressure equalization, air will be drawn in from outside, too. Moisture causes corrosion and provides […]

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How a Pressure Relief Valve Handles Pressure Differentials

Sierra Cases — Thu, 13 Dec 2012 16:25:11 +0000

The greatest strength of the well-constructed transit case is also its greatest weakness. An airtight seal keeps moisture and dust at bay but can lead to a significant pressure differential. If the case becomes pressurized—say you close it at night and leave it in the desert sun all day—the sides might bulge, and the seal […]

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Pressure Relief Valves: The Smart Way to Handle Pressure Changes

Sierra Cases — Tue, 04 Dec 2012 16:27:31 +0000

You've packed your delicate items in an airtight case to protect them from moisture and dust. Air can't get in or out. That's the purpose. But, what happens when the outside pressure changes? Altitude and Transit Cases Say you close the case in San Diego, then drive it over the mountains to Denver, Colorado. Denver […]

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