Can I Use A Glass Bowl In A Pressure Cooker?

Are Glass Bowls Suitable for Using in A Pressure Cooker?

A common myth about cooking with glass bowls or containers is that they will shatter when heated. This isn’t always true.

Tempered glass is much stronger than regular glass and can withstand high temperatures without breaking.

However, not all tempered glass is made to handle certain types of heat like microwaves, pressure cookers, or stovetops.

Tempered microwave-proof bowls will have a label on them that says they are suitable for use in a microwave.

Make sure to read the label carefully before you buy, and choose a bowl that is made for microwaving.

Stove-safe bowls will say “oven-safe”. Most tempered glassware is oven-proof, but not all are stovetop, microwave, or dishwasher safe.

This means you should only use bowls labeled “oven-proof” in a pressure cooker for the safest results.

what is tempered glass?

What is tempered glass?

Tempered glass (TG) is a type of safety glass that has been heated and cooled to increase strength. It was created by Frenchmen Édouard Bénédictus in the late 1800s.

TG is five to ten times stronger than standard home window glass, and it’s so strong that it will not break into large shards when broken.

Tempering makes TG four times more resistant to pressure compared with annealed (standard) plate glass.

TG is used in windows, shower enclosures, and other safety-glass applications that require a solid product to resist breakage from impact or penetration.

In the case of a pressure cooker, there should be no problem with using a tempered glass bowl in a pressure cooker as long as it’s labeled oven safe (oven proof).

Suppose the pressure cooker manufacturer (such as Instant Pot) advises against using any glass in their appliance. In that case, they will indicate on the packaging or in the user manual, and this advice must be followed. 

To avoid confusion, it’s important to note that TG is not the same as toughened glass or safety glass.

Tempered and toughened glasses have a different composition than annealed plate glass (standard window pane) which can make them more resistant to breakage from pressure, but there is still some risk of breakage.

How do you know if your bowl is safe for use with a pressure cooker?

How Do You Know If Your Bowl Is Safe For Use With A Pressure Cooker?

There are a few ways that you will know if your bowl is safe for pressure cooker use.

  1. The first way is to read the instruction manual that came with your pressure cooker. If it does not recommend using any glass bowl, you will want to avoid doing so.
  2. Please look for any markings on your bowl that indicate whether it is TG or annealed glass.
  3. Check for any markings that indicate whether or not the bowl is oven-safe.
  4. Check the side of your pressure cooker for any words that indicate whether or not it is safe to use with tempered and toughened glasses. If you doubt, contact the manufacturer of your pot/glass bowl combo before using them together for fear of breakage from heat expansion.
  5. Check the bowl and ensure that there are no cracks or chips on it. Even if TG is used, it stands a far great chance of breaking if the bowl is chipped or cracked.
What type of bowls should not be used in a pressure cooker inner pot?

What Type Of Bowls Should Not Be Used In A Pressure Cooker Inner Pot?

As previously mentioned, a glass bowl that is not tempered or oven-safe should never be used with a pressure cooker as it may not be able to handle the pot pressure of a pressure cooker.

Below is a list of containers/bowls that are suitable or unsuitable to use in a pressure cooker:

  1. Oven-safe – Any dish that is suitable for oven use can also resist the pressures and temperatures of a pressure cooker.
  2. Food-grade – Glass containers are not necessarily food-safe, and the type of glass can affect safety. The container needs to be made of food-grade materials.
  3. Non-hermetic– Do not use a container that seals tightly. A container that seals tightly will build up pressure, but it does not have any openings for the pressure to escape. (but what about canning jars (mason jars)? Canning and canning jars is a topic all on it’s on which I will discuss in a different post)

Ideally, most of the time, you would want to use a stainless steel bowl (the inner pot).

What are some of the benefits of using glass bowls in pressure cookers

What Are Some Of The Benefits Of Using Glass Bowls In Pressure Cookers

The benefits of using a glass bowl in a pressure cooker are that they don’t scratch easily and can be used to make some dishes.

Glass dishes are also easier to clean, as you can toss them in the dishwasher.

Glass bowls also work very well when doing pot-in-pot cooking within a pressure cooker such as an Instant Pot.

What exactly is Pot-in-Pot Cooking?

What Exactly Is Pot-in-Pot Cooking?

You may have heard of the term pot-in-pot cooking as it is a term regularly used in many Instant Pot Recipes.

Pot-in-Pot refers to cooking two different dishes simultaneously by placing one of them on a trivet or steamer basket inside another pot filled with water.

A pressure cooker is perfect for this technique because it can cook food faster and evenly than other cooking methods such as boiling, oven baking, grilling, etc.

When you are cooking a dish, it can be hard to know what type of cooking method you should use, pot-in-pot or right inside the inner pot. I have found the following dishes to be best suited to PIP cooking in the Instant Pot.

  • Recipes that don’t need liquid. Like meatloaf and Lasagna.
  • Recipes that do not use a full 1 or 1.5 cups of thin liquid (like water, soy sauce, broth) will not work with an electric pressure cooker because you need that amount of liquid to reach the required level of pressure for these appliances.
  • A recipe with a thick sauce or gravy
  • Water bath or “bain-marie” recipes like cheesecake or creme brulee.
  • To steam vegetables or delicate foods.
  • To cook two dishes simultaneously.
  • A recipe containing dairy.
  • To reheat a meal.
Safety Measures to Take Into Consideration

Safety Measures to Take Into Consideration.

When using a glass bowl when you pressure cook, I recommend keeping these safety measures in mind.

  • Before every use, check for cracks in the bowl. Please do this by looking at it and tapping it with your finger. If you hear a crack, throw away the bowl. You shouldn’t use the damaged bowl when cooking anything because it can break even further.
  • Don’t put your glass bowl on the pot’s bottom when you cook. Use a wire trivet, steamer insert, or other support.
  • If you want to cover your container, do not seal it. The method you should use is to put a loose lid on the container or use a plate or aluminum foil to ensure there is some pressure release while cooking.

Frequently Asked Questions

Pyrex does not recommend that you use their glass bowls while pressure cooking. Therefore, you should not use the Pyrex glass bowl in a pressure cooker, but you can safely use another brand that is marked as oven-safe.

Sure, as long as the measurements are correct and oven-safe, you can use any glass bowl type in a pressure cooker.

The Instant Pot does come with a tempered glass lid with a steam vent and a stainless steel rim. It is for use with the Instant Pot multi-use programmable pressure cooker. The lid is good to use when your cooker goes into the Keep Warm mode or when you are using the Sauté or Slow Cook programs.

Glass bowls are made from materials that don't scratch easily, so they're easy to clean. They also work well with steamer baskets or trivets inside your pressure cooker.

Glass dishes can break when heated or cooled, so it's essential to check for cracks before each use.

No. If you're cooking with liquid, it's best to use a wire trivet or steamer basket inside your pot to avoid damaging the glass bowl.

Glass bowls are safe so long as they're not cracked and the dish isn't liquid-based.

Glass dishes are easy to check for cracks: look at them and tap with your finger to see if you hear a break. If not, then the bowl should be safe enough until next time!

If you're cooking a dish that doesn't have liquid, it's best to use an alternative method because the pressure cooker requires at least some thin liquid (like water or broth) to reach its boiling point.

6 Great Pressure Cookers

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Instant Pot Duo

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Yedi 9-in-1 Cooker

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Ninja Foodi 8-Quart

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All American 921

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Instant Pot Duo Evo Plus

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Breville Fast Slow Pro