How to Kasher Quartz Countertops

What is Kashering?

Kashering refers to the Jewish ritual of making utensils suitable for use on Passover by removing any traces of chametz (leavened foods). This is done by thoroughly cleaning and then applying heat, through boiling, torching or other methods. The process renders the item free of any residual chametz that may have absorbed over the year.

Can You Kasher Quartz?

Quartz countertops are made of engineered stone, consisting of roughly 90% ground natural quartz crystals and 10% polymer resins and pigments. There has been much debate over whether quartz countertops can be kashered for Passover. Many rabbis approve kashering quartz through a specialized process, while others prohibit it. Consult your rabbi to determine their position.

How to Prepare Quartz for Kashering

Proper preparation is key to successful kashering. Here are the steps to take:

Thoroughly Clean the Surface

  • Remove everything from the countertops, including appliances, soap dispensers, cutting boards, etc.
  • Clean the quartz surfaces thoroughly with a non-abrasive cleaner or quartz-safe cleaner. Remove any oil buildup or residue.
  • Run your hand over the surface and clean any noticeable debris or crumbs. Pay close attention to cracks, crevices and seams.
  • Clean 2-3 inches up the wall from the countertop as an additional precaution.

Kasher Sinks First

Any sinks in the quartz should be kashered before the counter surface. Consult your rabbi on the appropriate method for sink kashering, which may include:

  • Thoroughly cleaning out and scrubbing the sink.
  • Letting it sit idle for 24 hours.
  • Boiling water over every part of the sink.

Designate New Utensils

  • Obtain new sponges, cleaning cloths, and other utensils that will be used only for Passover. Don’t use any year-round utensils when cleaning or prepping the counters.

Cover Surface Cracks

  • Inspect the countertops closely and identify any small cracks or crevices, especially near the wall and edges.
  • Stuff cracks tightly with a silicone caulking or other waterproof substance to seal off any trapped residue. This prevents it from getting released during the kashering process.

How to Kasher Quartz Countertops

Once properly prepared, quartz countertops can be kashered in the following manner:

Libun Gamur (Burning)

Libun gamur involves applying direct flame to the quartz surface:

  • Turn on all stovetop burners and open all sinks to release intense heat underneath countertops. This helps dissipate absorbed chametz.
  • Blow torch the surface, especially seams, edges and corners. Caution: Maintain torch 6-8 inches above surface to avoid damage.
  • Pour boiling water from a kettle over every part of the countertop surface.
  • Rinse with cold water and dry completely with a paper towel.

Irui (Pouraging)

If libun gamur is not possible, irui kashering may be done:

  • Boil a large pot or kettle of water.
  • Working in sections, pour the boiling water slowly and gently over every part of the quartz surface. Avoid splashing which can be dangerous.
  • As you pour, immediate wipe each section with a clean paper towel or cloth.
  • Rinse with cold water and dry completely with a paper towel.

Hagala (Immersion)

Some opinions allow irui to be followed by hagala:

  • Construct a large trough or bin that can fit your entire countertop section. Alternatively, use a non-Pesach liner in your kitchen sink.
  • Immerse racks or grates in the water first, upon which the countertop section will rest.
  • Immerse the entire countertop section in the boiling water for a few moments.
  • Remove and rinse with cold water. Dry thoroughly with a paper towel.

After Kashering Care

Once kashered, the following precautions should be taken:

  • Refrain from placing any hot pots, pans or other heat sources directly on the countertop surface, as this can re-absorb chametz. Always use hot pads.
  • Immediately clean any spills, splatters or residues that occur on the surface during Passover. Don’t allow it to sit.
  • Avoid getting the countertops wet as much as possible, since moisture can also re-absorb chametz.
  • Use a non-Pesach liner for sinks. Change it frequently.
  • Use only Pesach-designated sponges, cloths and cleaning agents on the counters.

With proper preparation and care, quartz countertops can be made kosher for Passover use. Always consult your rabbi regarding the kashering process to ensure it is done correctly according to Jewish law. Wishing you a happy and kosher Pesach!

Frequently Asked Questions About Kashering Quartz Countertops

Can all quartz countertops be kashered for Passover?

Some rabbis prohibit kashering any quartz countertops due to concerns over irreversible absorption in the material. Others allow certain types of engineered quartz to be kashered via libun gamur or irui methods. Consult your rabbi.

Do I need to kasher a quartz kitchen island?

Yes, kitchen islands should be kashered along with the rest of the countertops if used for food prep. Thoroughly clean and follow the kashering steps. Avoid placing hot items on top.

Do I need to kasher a quartz bathroom vanity?

Most opinions do not require kashering quartz bathroom vanities, since they are not used for food prep or chametz storage. But clean thoroughly as an extra precaution.

How soon before Passover should I kasher quartz?

It’s best to kasher 1-2 weeks before the holiday to avoid any issues. Don’t wait until the last minute in case you need a rabbi to assist.

What if my quartz countertop gets cracks?

Inspect closely for cracks which can release absorbed chametz. Seal cracks with silicone caulk before kashering. Very deep cracks may mean that section can’t be properly kashered.

Can I use plastic wrap on quartz when cooking for Passover?

No, plastic wrap or other coverings cannot be used on kashered countertops. This risks re-absorption of chametz which defeats the kashering process.


Kashering quartz countertops for Passover takes effort but can be done when following the detailed rabbinically-approved process. With proper preparation, cleaning, safe application of libun gamur and/or irui, and cautious aftercare, quartz countertops in kosher kitchens can be utilized for the holiday. Always consult your rabbi to ensure your kashering method meets the requirements of Jewish law for a kosher Pesach.