Watertightness
The watertightness of the CASIO watches complies with DIN 8310 and ISO 2281. These standards describe the various classes of watertightness and the test procedure used to determine watertightness. This excludes models that do not display the ""Water Resist"" inscription. These watches must never come into contact with water.
In principle, watertightness according to DIN 8310 and ISO 2281 is not a permanent characteristic, since existing seals naturally wear with age. Extremely high and low temperatures, solvents and cosmetics accelerate this process, whereby seals quickly become brittle and porous and the watertightness of the models is no longer guaranteed. Watches should be used in ""normal"" temperature ranges, between approx. +10°C and +50°C.
Scope:
These standards shall apply to the general use of wristwatches.
Watches with metre indications for watertightness cannot be used immediately in this water depth, however, as the watertightness metre indications are merely a pictorial representation of the test pressure.
A wristwatch withstands the impact of water at the static pressure specified on the watch (e.g. 10 bar) and the theoretical immersion in water at the specified depth.
As a result of movements in the water, such as a forceful swimming motion or a stroke on the water, the resulting dynamic pressure can exceed the specified static pressure many times over, thereby impairing the predetermined watertightness of the watch.
Watertightness classification
| Labelling | Instructions for use | |||
|---|---|---|---|---|
 |
 |
 |
 |
|
| Inscription base of housing | Splashes of water, rain | Bathing, washing, showering | Swimming, snorkelling | Free-diving without equipment |
| No information | No | No | No | No |
| Water Resistant | Yes | No | No | No |
| Water Resist 5BAR | Yes | Yes | No | No |
| Water Resist 10BAR | Yes | Yes | Yes | No |
| Water Resist 20BAR | Yes | Yes | Yes | Yes |
Watertightness classification (5 bar/50 m*)
The watch is checked for watertightness up to 5 bar, which corresponds to the pressure of a hypothetical water column of 50 metres that is supported by a square centimetre. It is therefore best suited to everyday use such as bathing, showering or washing your hands.
Watertightness classification (10 bar/100m*)
The watch is checked for watertightness up to 10 bar, which corresponds to the pressure of a hypothetical water column of 100 metres that is supported by a square centimetre. So it is best suited to frequent swimming or snorkelling, for example.
Watertightness classification (20 bar/200 m*)
The watch is checked for watertightness up to 20 bar, which corresponds to the pressure of a hypothetical water column of 200 metres that is supported by a square centimetre. It is therefore best suited to free-diving without equipment, for example.
*The meter indication refers to air pressure rather than depth, which is used in the context of the watertightness test. (ISO 2281)