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The laws regarding kashering glass are especially confusing, because the opinions range from one extreme to the other מקצה לקצה. • Rashba (Teshuva 1:233), Ran (Pesachim 9a) - glass is smooth, hard and does not absorb (or absorbs very little) and therefore does not need to be kashered. דשיעי וקשים ובליעתם מעוטה מכל הכלים • Ra’ah (Brought by Ritva Pesachim 30b) – Glass is boleya and is polet like metal, but may not be kashered with hagalah because we are concerned that it might crack, משום דחייס שמא פקעה. • Mordechai – Glass has the status of cheres, הואיל ותחלת ברייתו מן החול. http://www.oukosher.org/index.php/common/article/lo_basi_ella_lorer_glass/