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Re: "FrogSuit" waterproof cases for iPads
In the late 1960's early 1970's the FTC settled all questions about "waterproof" in a major settlement with Bulova, who wre selling "Waterproof" watches that were in fact only water resistant.
The bottom line [pun intended] is that if you pour water on something, slowly, and the water can run off without doing damage, that is "water resistant". If you add any component of depth, pressure, or shock, you have to state it as "waterproof to..." and then cite the depth/pressure or G-shock rating that it can survive without damage.
The more common ones today are IP65 and IP67, there are international standards for "casual" waterproofing as opposed to deep pressure resistance. (As you go down deeper, the water pressure gets higher.)
There are more standards and conventions over whether the rating is for something that is static, or something that is in use. For instance, watches use o-ring seals, and they are rated waterproof to a certain depth--but only if you do not operate whatever the o-ring is sealing. As opposed to Ikelite camera housings, that are designed to be operated to a stated depth, using o-ring and x-ring seals.
Froggy, water pressure tends to be uniform. If you put an iPad in a EwaMarine pouch (grand daddy of the "ziplock" pouches) I'd expect it to have no problem down to 50 feet or more. As opposed to putting "the same" pressure on it by sitting on the iPad, which would put local stresses on the screen and probably shatter it. But all waterproof seals require maintenance, and eventually fail. The really good stuff just takes a very long time to fail. (G)