PRECISION WATCH REPAIR BY CHARLIE SQUIRES
Water Resistance: A federally approved term to indicate the amount of pressure a watch can withstand under water without leaking or losing accuracy. Water Tightness is achieved by installing seals between major parts of the watch case and a specially designed setting crown which, together, prevent moisture from entering the case.
Water resistance is NOT permanent.
In order to maintain the integrity of this water resistant system, periodic maintenance is required.
Gasket's on the case back, setting crown and crystal deteriorate over time under normal use as they are subject to many aggressions; dust, temperature changes, cosmetics, perspiration, etc. leaving your watch vulnerable to moisture damage.
Therefore, these parts must be inspected annually and replaced as necessary. In addition, water-resistant watches must be tested to ensure a proper seal has been re-established.
Squires Watches checks the water resistance of a watch
by means of the deformation principle.
The pressure causes a certain amount of deformation of the watch. This deformation remains constant in the case of a fully sealed watch provided the pressure remains constant. In the case of a leaky watch, the air seeping into the watch case results in an internal pressure equalization which relaxes the deformation.
The outcome is referred back to the ISO 2281 standard for water resistant watches providing unquestionable results.