Sunday, January 15, 2017

By Nancy Allen


A watch which is being considered as water resistant can be wet by water but only up to an extent and not for so long. Most of the watches are being categorized to different degrees of the depth of immersion. Thus, one must always remember that the ratings of resistances provided by the manufacturers are based on the controlled conditions from laboratories.

Resistances of watches decrease over time because of some constant changes in conditions and in aging. Another thing that needs to be remembered importantly is the difference between being resistant and being waterproof. One best example for this is changing the battery of your watch. When the seal or covering is put back, it cannot protect your watch anymore like before. And because of this, a watch water resistance testing Cambridge would be very important.

In Cambridge, MA, most manufacturers are suggesting their clients to have them test their watches every year or even after the battery is changed. This will ensure that sealing it was done properly, and thus, waters are avoided to get in. The tests will be done in laboratories of manufacturers under some specific controlled conditions. Expect that test results may fully be different from real life actions.

In the test, a chamber filled with half air and water will be used, wherein the item is going to be placed. The item is taken out from water. And while increasing the pressure of the air, it will be immersed into it very slowly. When it is already immersed completely, the air pressure will be released slowly. When bubbles come out, this would mean that your watch does not have any resistance.

The shapes of gasket seals may also be affected by the temperature of waters such as in hot showers and hot tubs. This is possible to happen when dipping the item to a hot temperature and immediately dipping it into cold temperature. For example, the item is placed in a hot tub and directly transferred to pool right after. Stressing the gaskets through rapid changes in pressure can rupture them.

The resistance in watches is being obtained by three important factors. These factors are case back, crown, and gaskets. The attachment of case backs into watches may imply different levels of resistances. There are two types of case backs and these are the snap on and screw in.

The snap on type is sealed by a pressure and is considered to be the least resistant. And the second level which is the screw in type that allows tighter seal to case back. The screw in types will be threaded before being screwed to a case. And with the use of threading and gasket as its seal, a double seal is created.

The crowns also have 2 types which include the screw down crown and the crown stem. If the crown will move continuously, this is stressing the gasket constantly. The screw down is also threaded along with matching screws for threaded tubes. This type can be essential for submerged watches in water.

O rings also refers to gaskets. The common materials used for these are either Teflon, rubber, or nylon. These are forming watertight seals in joints wherein crown, crystal, and caseback will meet the watch case. Gaskets often break down easily and erode as well, causing the diminishing of resistance.




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