Waterproof grade ip44

Waterproof level
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Domestic Standards
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This standard applies to watches marked as waterproof, with or without an additional overpressure mark, and does not apply to diving watches. Meaning: Any watch marked as waterproof, regardless of whether it has an additional overpressure mark or not, in addition to being waterproof in daily life, can also be worn for swimming in a short period of time and under conditions of changes in water pressure and water temperature. However, , they cannot be used for diving with or without an additional overpressure marking. The technical requirements and test methods are as follows
① Air pressure resistance performance: Place the watch in air with a higher pressure than normal atmospheric pressure, and measure the air leakage rate entering the watch case (use a special instrument to detect it). Air leakage flow rate micrograms/minute.
② Water pressure resistance: Immerse the watch in a container filled with water, and apply a pressure value that is the same as the overpressure mark value within minutes. If the watch does not have an overpressure mark, the pressure value is , and maintain it for minutes, and then , the pressure should be reduced to the ambient pressure within minutes. During the condensation test, no condensation should appear on the inner surface of the watch glass.
③ Waterproof performance with a water immersion depth of centimeters. Immerse the watch in water with a depth of centimeters and keep it for an hour. Then do a condensation test, and no condensation should appear on the inner surface of the watch glass.
④ Mechanical pressure resistance of operating parts Immerse the watch in water with a depth of centimeters, apply Newton force in the direction perpendicular to the axial direction of the crown or button, and maintain it for minutes. Then do a condensation test, and no condensation should appear on the inner surface of the watch glass.
⑤ Resistance to water temperature changes: Immerse the watch in water of different temperatures with a depth of centimeters in sequence, place it in water at ℃ for 1 minute, place it in water at ℃ for 1 minute, place it in water at ℃ for 1 minute (take the watch out of the water and immerse it in another water temperature again) The time in must not exceed minutes). Then do a condensation test, and no condensation should appear on the inner surface of the watch glass.
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