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www.crcweb.org 22Th e following items may not be kashered for Passover:• China, pottery, earthenware, cement/concrete and enameled pots may not be kashered for Pass-over. Th e Ashkenazic custom is to not kasher glass, with the excep-tion of glass stovetops discussed below. Th ere is a diff erence of opinion as to whether plasticand other synthetic materials are included in this rule, and the cRc position is that those materials may be kashered.• Utensils and appliances which cannot be thoroughly cleaned such as those having crevices in which chametz can accumulate may not be kashered for Passover. Some examples of this are dish-washers, sieves, graters, utensils with loose-fi tting handles, and bottles with narrow necks.• Materials which might get ruined during the kashering process may not be kashered for Passover, as the Rabbis were concerned that the person would not kasher properly for fear of ruining the utensil or appliance.We now turn to the parts of the kitchen which can be kashered.FlatwareSilver, stainless steel, and plasticfl atware may be kashered. Th e pro-cess begins with a thorough cleaning, after which the utensil should not be used for 24 hours. A pot of water is brought to a rolling boil, and the pieces of fl atware are dropped into the water one at a time. If the water stops boiling at any point, one must wait until it returns to a boil before putting in any more fl atware. Th e custom is to rinse the fl atware with cold water after kashering.Some have the custom to kasher in a dedicated “kashering pot” which is not used for anything else, but most kasher in any pot which is clean and has not been used for 24 hours.Pots and PansStandard metal pots are kashered in the same manner as fl atware; consult with your Rabbi if the pot which requires kashering is too large to fi t into any other pot of boiling water. Enameled pots and glass pots (e.g. Pyrex) cannot be kashered.In general, baking, roasting, and frying pans cannot be kashered for Passover unless they are always used with generous amounts of oil or other grease when cooking. If that is the case, they can be kashered via libun kal which involves cleaning the pans well, not using them for 24 hours and then putting them on an open fl ame until both the inside and Kashering the KitchenIntroductionDishes, utensils, kitchen appliances, countertops, and anything else used with food year-round, cannot be used for Passover unless it goes through a process known as “kashering” or “hechsher keilim”. For a few items kashering just involves thoroughly cleaning the item, but for most items kashering also requires submerging the item in boiling water or a similar hot process. Th e laws of kashering are quite complex, and this article will present practical points; readers are encouraged to discuss any questions not covered in this article with their local Orthodox Rabbi. New UtensilsMany people choose to purchase extra dishes, fl atware, and other utensils which are kept from year to year for Passover use, thereby avoiding the need to kasher those items.• All new metal, aluminum and glass utensils require tevilat keilim (ritual immersion) in a kosher mikvah (ritual bath).• New disposable aluminum pans are acceptable for Pass-over without special certifi ca-tion. Ritual immersion and the appropriate bracha (bless-ing) are required if the pans will be used more than once.• New utensils made of plastic or Styrofoam are acceptable without special certifi cation, and ritual immersion is not required.