WATER RESISTANCE

NOT ALL WATER RESISTANT STANDARDS ARE CREATED EQUAL

Water can have a huge impact on the mechanical components of an automatic watch.  Internal parts are made from either brass or carbon steel.  Brass loses its zinc component quickly when exposed to water, causing the metal to weaken and putting its structural integrity at risk.  Carbon steel is highly susceptible to natural oxidation and galvanic corrosion.  If exposed even briefly, rust can set in and quickly spread.  Sensitive items, such as the dial and hands, can be destroyed beyond repair even if the exposure is limited.

The differences between ISO 22810 and ISO 6425 are “staggering."   -  Gear Patrol 

ISO 6425 (Seaholm) ISO 22810 (Industry)
Depth testing 125% of depth rating 100% of depth rating
Testing Duration Tested for 2 hours Tested for 10 minutes
Testing Medium Water Immersion Air Pressure
Testing Frequency Every Watch Sample testing
Resistance to a Magnetic Field Tested Not Tested
Resistance to Shock Tested Not Tested
Resistance to Salt Water Tested Not Tested
Reliability Under Water Tested Not Tested
Resistance to External Force Tested Not Tested
Resistance to Thermal Shock Pre and Post Depth Testing Sample testing
Time-preselecting device Required Not Required
Legible at a distance in the dark Required Not Required

THE THREE PILLARS OF WATER RESISTANCE

Condensation

Condensation is the silent killer.  Even minor amounts of condensation inside the case will have a lasting impact on the durability and accuracy of your automatic watch.   SEAHOLM applies thermal shock tests before and after depth testing as mandated by ISO 6425 to insure of cases are impervious to condensation.

CORROSION

SEAHOLM tests for saltwater corrosion.  We use marine grade 316L stainless steel in all cases and crowns to insure SEAHOLM watches thrive in high salinity environments.

DEPTH

It's fun to see how "low can you go".  But for SEAHOLM water tighness in all facets of use is more important than acheiving a depth rating beyond what most divers can physically acheive.  SEAHOLM tests every case to 125% of the 200m depth rating.  SEAHOLM watches are tested to Diver's standards.

SHOCK RESISTANT

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ANTI-MAGNETIC

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