Any "quarry tile" or "porcelain tile" is usually suitable for exterior use when freeze/thaw is an issue.
The "ratings" have nothing to do with the body of the tile, they only refer to the wear-surface and suitability of an application as it relates to wear surface.
A tile rated at a 4 or 5 doesn't make it suitable for exterior use. Those ratings are not what determines a tile can be used out of doors.
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