[Jewelry making - Article 01037] - [Orchid] Ultrasonic cleaner and damage to hands

[Danny Mitchell]

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Hi Tina, 

    Ultrasonic vibrations of more than about 50kHz travelling through
    air are attenuated so heavily that they are effectively not
    transmitted at all (that's why they use that jelly-like substance
    when they use ultrasound to image foetuses - it conducts the sound.)
    In practical terms, this means that ultrasonic cleaners pose no risk
    unless you (a) put your hands into the water, or (b) hold the item
    you're cleaning whilst it's in the water (because it conducts the
    ultrasonic vibrations into your hand.) Ultrasonic vibrations can
    cause serious damage: ship screws (propellers) are frequently pitted
    on the forward side due to ultrasonic boiling of the metal. Hope
    this helps, DM --


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