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The term "imperable" is not a standard word in English; it may be a misspelling or confusion with "impermeable," which means not allowing fluid to pass through. If you meant a different term, please clarify. In context, "impermeable" often describes materials that resist penetration by liquids or gases.
Clay is permeable, meaning it allows liquids or gases to pass through it. It is not impermeable, which would prevent the passage of liquids or gases.