Water resistance is one of the most important protective features of a watch. At the center of that protection are watch gaskets. These small seals prevent moisture dust and air from entering the case and damaging the movement.
Understanding how gaskets work when they should be replaced and how they affect water resistance is essential for proper watch maintenance.
What Are Watch Gaskets
Watch gaskets are rubber or synthetic seals installed at key entry points of the watch case. They create a tight barrier that protects internal components from external elements.
Most watches use multiple gaskets working together to maintain water resistance.
Common Gasket Locations
A typical watch contains several gaskets including
• Case back gasket
• Crown gasket
• Crystal gasket
• Push button gaskets on chronographs
If even one gasket fails water resistance is compromised.
Types of Watch Gasket Materials
Rubber Gaskets
Rubber gaskets are commonly used in everyday watches.
Benefits include
• Flexible sealing
• Low cost
• Easy replacement
They may dry out over time and require regular replacement.
Silicone Gaskets
Silicone gaskets offer improved elasticity.
Advantages include
• Better temperature resistance
• Longer service life
• Improved sealing
They are often used in higher quality watches.
Nylon and Teflon Gaskets
These gaskets are found in specific designs and vintage cases.
Features include
• Chemical resistance
• Structural stability
• Precise fit
They are typically used for crystal seating.
What Does Water Resistance Really Mean
Water resistance ratings do not indicate diving depth.
Common ratings include
• 30 meters suitable for splashes only
• 50 meters suitable for hand washing
• 100 meters suitable for swimming
• 200 meters or more suitable for diving
Real world pressure differs significantly from static testing conditions.
When Gaskets Should Be Replaced
Gaskets should be replaced
• During every battery change
• Whenever the case is opened
• If the watch shows moisture
• At least every two to three years
Old gaskets lose elasticity and cannot reseal properly.
Importance of Gasket Lubrication
Lubrication improves sealing performance.
Proper lubrication
• Prevents gasket tearing
• Improves compression
• Extends gasket lifespan
Only silicone based gasket grease should be used.
Pressure Testing After Service
After gasket replacement water resistance should be verified.
Testing methods include
• Dry pressure testing
• Wet pressure testing
Professional testing ensures the watch meets its rated resistance.
Common Causes of Water Damage
Water damage often results from
• Worn crown gaskets
• Improperly seated case backs
• Cracked crystals
• Dried or flattened seals
Regular gasket inspection prevents costly repairs.
Final Thoughts
Watch gaskets may be small but they play a critical role in protecting your timepiece. Proper gasket selection installation and maintenance ensure reliable water resistance and long term movement protection.
At Swiss Watch Material & Tools Ltd, we supply professional watch gaskets sealing materials and tools used by watchmakers worldwide.