Waterproof vs IP Rating: What IPX7 Actually Means for a Shaver or Toothbrush
Water resistance is one of the first things people check on a shaver. What a product page usually offers, though, is a sentence rather than a rating. The two look similar and can be verified to very different degrees.
This piece reads the public bibliographic record of the standard that defines the IP code next to the wording on one manufacturer’s product page. It tests nothing and rates nothing.
The IP code is a classification defined by a standard
The IP code is defined by IEC 60529, published by the International Electrotechnical Commission. The public record shows the current document as IEC 60529:1989 consolidated with its 1999 and 2013 amendments, titled Degrees of protection provided by enclosures (IP Code), edition 2.2, dated 29 August 2013.
Its scope is stated as well: it applies to the classification of degrees of protection provided by enclosures for electrical equipment with a rated voltage not exceeding 72.5 kV.
What matters here is the kind of thing it is. An IP code is a classification assigned under conditions the standard fixes, which is what allows one company’s product to be placed on the same axis as another’s.
The product page offers a sentence instead
The Braun Series 9 Pro Plus page puts it this way: 100% waterproof. Tested to resist under water up to 24 hours. Wet or dry, with or without foam.
No IP code appears on that page. There is no IPX7 or equivalent notation anywhere on it. What the page provides is a description the company writes on the basis of its own testing.
Neither form is wrong. Twenty-four hours is, if anything, a more specific figure than a code digit. But the sentence does not sit inside a box the standard defines, so it does not line up against another product’s rating for comparison.
Two questions to carry to any product page
First, is a rating printed at all, and if so, under which standard and at which degree.
Second, if there is no rating, what is the sentence resting on. A claim that arrives with its test conditions and a claim that says only waterproof are verifiable to different depths.
What has been checked here ends at the standard’s bibliographic record and the wording on one product page. The test conditions behind each digit live in the body of the standard, which is sold rather than published openly, so they are not restated here.
Sources checked
Scope — This article explains devices and technology. It does not provide individual diagnosis or treatment advice.