How to Use Cast Iron on a Glass Cooktop to Prevent Scratches

Cast iron cookware is durable, wear-resistant, conducts heat, retains it well, and is eco-friendly. Even though cast iron has many advantages, many people are unsure whether it can be used on a glass cooktop. Let’s find out whether cast iron is glass-friendly, how to use cast iron on a glass cooktop and how to protect a glass top stove from cast iron.

Can I use cast iron on a glass cooktop? Even though cast iron can be used on a glass cooktop, you should be careful. Cast iron may damage the glass cooktop if dropped. Do not slide cast iron to prevent scratches. Glass cooktops require cookware with a flat bottom and a coating to ensure good absorption of heat. 

When it comes to glass cooktops, you cannot use cookware with an uncoated aluminum or copper bottom. Being much less hard, these metals interact with the surface of the cooktop and leave scratches on it, affecting the appliance’s service life. However, cast iron can be safely used on glass cooktops as long as you follow some basic rules. Let’s dive into the peculiarities of using cast iron on a glass cooktop.

How to Use Cast Iron on a Glass Cooktop?

Cast iron cookware can be used on a glass cooktop, provided that it has not previously been used with other types of stoves – gas or electric. The cookware’s surface should be absolutely flat, and the diameter should match or be less than the diameter of the burner on your cooktop.

  • The thickness of the bottom of cast-iron cookware should not be less than two millimeters.
  • Cast iron cookware designed for use on a glass cooktop shouldn’t be too cheap. Buy only high-quality cast iron.
  • Check the manufacturer’s recommendations: usually, a special marking indicates compatibility with glass cooktops.

How to protect a glass top stove from cast iron? How do you use cast iron on a glass cooktop? To use cast iron on a glass cooktop safely, follow these tips:

  1. Replace your old cast iron with new high-quality cookware with a flat bottom of more than 3 mm.
  2. Never move or slide cast iron on a glass cooktop.
  3. Look after cast iron cookware and never scratch its bottom.
  4. Clean your glass cooktop every time after use when it cools down.
  5. Do not use cast iron cookware that is bigger than the burner.
  6. If cast iron cookware is damaged, do not use it on a glass cooktop.

How do you keep cast iron from scratching on a glass top stove? To keep cast iron from scratching on a glass top stove, ensure the cookware does not have any food residue on the bottom and a glass cooktop is clean and dry. Cast iron must not have any rough bumps or chips on the exterior to avoid scratching.

Replace Your Old Cast Iron

When you spend a lot of money on a glass cooktop, the last thing you want to do is to damage its surface with old cast iron. While cast iron is safe on a glass cooktop, you must make sure it is in good condition. Old cast iron might have scratches or old food residue on the exterior that might scratch the glass cooktop. Invest in new smooth cast iron cookware of premium quality to avoid an unnecessary headache and wasting money. High-quality cast iron cannot be cheap, so you will need to spend additional money to protect your appliance. If you notice rough spots or chips on the cookware, throw it away and replace it with a new one before you start cooking.

Do Not Slide Cast Iron

Cast iron cookware is heavy itself and may scratch the surface of the glass cooktop. To prevent this from happening, place the cookware directly on the burner, and if you need to move it, lift the cookware and move it in the air. Make sure your cookware is not too heavy for a cooktop as it may lead to cracks. While this advice might sound simple, it is easy to forget. Your cookware should be a bit smaller than the burner itself, and it will be easier to place it directly on the burner without needing to move it. Heavy cast iron will definitely break the surface of the glass cooktop if you drop it. Always make sure you do not fill the pot or pan too much not to be easy to drop.

Look After Cast Iron Cookware

Your cast iron cookware must be in excellent condition if you want to use it on a glass cooktop. Any rough bumps or chips on its bottom will scratch the cooktop, and it will become impossible to use. Wash cast-iron cookware only by hand, with hot or warm water with a soft sponge or brush (not metal) and be sure to wipe dry. Then lubricate the inner surface of the cookware with vegetable oil for storage, and heat the dishes well before the next use.

All cast iron cookware is prone to rust, so it must be stored absolutely dry. That is, after the pan has been washed, it should be thoroughly ignited over a fire. You can also wipe it off with a towel or paper, but this will not completely dry out the cast-iron pan.

Clean Your Glass Cooktop

Try to remove food residue from a glass cooktop’s surface as soon as you notice it. It is much easier and quicker to clean the surface immediately rather than wipe off the burnt milk or fat later. Before you start cooking, make sure that your stove is clean and dry. Even though you need to start cleaning the glass cooktop as soon as possible, you can still do this only when it has completely cooled down. The heat indicator will show you the temperature of the cooking zones.

If there are any stains on the surface of the stove, remove them before cooking. Otherwise, they will burn and dry out to such an extent that they cannot be wiped off. Forget about using metal sponges and cleaning agents containing abrasive particles to easily damage the surface and leave deep scratches on it. The glass cooktop must be cleaned regularly as even water can leave annoying stains on it. Try to match the diameter of the pots to the diameter of the cooking zones.

How to protect a glass top stove from cast iron? To protect a glass top from cast iron, make sure the cookware’s bottom does not have any rough bumps, chips or old food residue. Cast iron bottom must be at least 3 mm and smaller than the burner. Never slide or move the cookware on the glass cooktop to prevent scratches.

Advantages and Disadvantages of Cast Iron Cookware


  • Durability. Cast iron cookware has a long service life. It is one of the most durable materials.
  • Non-stick properties. If the bottom of the cookware is carefully looked after, then the food will not stick to it.
  • Wear-resistant. Cast iron cookware is not afraid of high or low temperatures, does not deform and has good wear resistance.
  • Even heating of the surface. Cast iron heats up quickly and maintains temperatures well, so you will be able to cook food faster.


  • Weight. Items made of cast iron are heavy enough. Before you buy cast iron, you should decide in advance on the dishes you plan to cook in them. For example, it is better to buy a pan for pancakes from a different material since the cast iron is too heavy to lift every time you make pancakes.
  • Rust. If you do not wipe cast iron, it will get rusty. Rust is removed with a stiff brush, and then the pan is calcined over a fire with salt and seasoned with oil. Cast iron enamel cookware does not rust, but care must be taken to prevent chips from appearing on it.
  • Oxidizing. Certain foods can damage the cast iron surface by oxidizing it, such as tomatoes or apples. Therefore, it is best to avoid preparing meals with these ingredients.
  • Food storage.  Storing food in cast-iron cookware is also not recommended since metal can absorb the smells of food. After cooking, it is best to transfer the leftover food to plastic or glass containers.


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