IP Ratings are only good when they come out of the factory, and there are not permanent.
IP67 Rating vs. IP68 Rating Differences
The differences between IP67 Rating vs. IP68 Rating enclosures are:
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An IP67 enclosure is rated to be protected from immersion, but only at a depth of 1 meter and for 30 minutes.
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An IP68 enclosure is rated to be protected from immersion of at least 1 meter and up to 30 minutes (This could also be extended if specified by the manufacturer).