Koshering Porcelain Cups for Pesach After Long Disuse - Ish Tsadik
Question:
We have not used our porcelain cups for over a year. Is it possible to kosher them for Pesach?
Answer

We are concerned that the law for porcelain vessels is the same as the law for earthenware (Keli Cheres), for which boiling (Hag’ala) is not effective.

Therefore, it is only in a case of great need (Sha’at HaDechak) or where there is a significant financial loss that one may rely on performing Hag’ala for old porcelain vessels, as ruled by Rabbi Moshe Feinstein.

19.03.2026
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