Use of Glassware for Dairy and Meat
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Question
Is there absorption in glassware?
Answer
According to the Shulchan Aruch, glass does not absorb, and therefore Sephardim do not strictly separate dairy and meat in glassware. According to the Rema, it does absorb but not immediately, rather slowly, and therefore Ashkenazim strictly separate dairy and meat in glassware and generally hold that boiling does not help [though there are places where even Ashkenazim are lenient].
Source
Shulchan Aruch (Orach Chaim, Siman 452, סעיף 26).
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