I'm Not Missing You and Pelican case: Difference between pages

Pelican cases are molded plastic containers that seal perfectly, with an airtight and watertight gasket. Pelican cases include a barometric relief valve made in gore-tex to prevent barotrauma to the case, during transportation, or when the air pressure in the environment may change.

Water leakage through barometric relief valve

If the case falls into a river, generally, if there is not too much contents, there will be enough air in the case to keep it afloat. Since most rivers flow downstream, the case will go from a high altitute to a low altitude, with a likely increase in pressure. The barometric relief valve will therefore, most likely, result in an exit of air, such that the contents of the case remains dry, since water will not go into a valve that is exhaling air.

The relief valve is made of gore-tex which is a hydrophobic membrane. It permit air to pass through but not water or other liquids including acids since gore-tex is an inert material

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