"Always start out with a larger pot than
what you think you need."
— Julia Child

Are All Glassware Microwave Safe

David Lawrence
• Thursday, 24 December, 2020
• 6 min read

The glass is quite an extraordinary material, and it is created by mixing and melting lime silicate, soda ash and sand until it becomes liquid. Glass dish is commonly used for the microwave because it has quite good heat-resistant and it is also chemically inert, or in other words, it doesn’t react with the food items when cooking in the microwave oven.


Yes, even though chemicals don’t leach from the glass into the food like plastic when cook in the microwave, some glass dish may break or shatter due to the rapid temperature changes when going in and out of the microwave. The label or logo is a symbol of a microwave with squiggly lines.

However, if the glass dish doesn’t have a certified safe logo printed on them, it doesn’t mean that the glass will definitely break when placed in the microwave oven, though. A non-microwaveable glass may shatter when you take it out from the microwave as it cools, and this is due to the earlier mentioned rapid temperature changes.

If the air in the hollow space (bubble) expand to a certain extent, the glass will then shatter. Make sure to allow the frozen food to thaw first to room temperature before transferring it into the microwave oven.

But if there isn’t one to be found, there is a method to determine whether your glass dish is really safe for microwave or not. Set the Time After you have placed both the cup and dish in the oven, microwave it for 1 minute.

If the glassware isn't labeled, check by microwaving the container on high for a minute or two and give it a quick feel. Glass that is not microwave safe may have tiny air bubbles that could expand during heating.

Some glass-ceramic dinnerware may shatter if heated in the microwave and then cooled too quickly; it will not be labeled as microwave safe.” Bottom line, always look for those magic words, microwave safe on the any containers before putting them in your microwave.

Many bowls and plates are considered microwave safe ; however, if you use the wrong dish, you could ruin both the dinnerware and the dinner. Microwaves are convenient appliances, but there are a few precautions you should know about when it comes to your dishes.

If you get a new piece of glassware that isn’t specifically marked as microwave safe, try using the steps we provided to quickly test the container. Yes, ceramics like stoneware and porcelain are generally safe for microwaves.

However, avoid microwaving any ceramic plates with metallic edges or finishes. Yes, but look for plastic containers that are specifically marked microwave safe.” Avoid single-use or disposable plastic containers that might melt or leach chemicals into food.

I came across a recipe for microwaved cheesecake made in a coffee cup. If they doesn't work in the micro, I would just do a pot DE crème or something that doesn't need to be cooked in the final vessel.

Pyrex glassware is conventional oven safe and microwave safe based on the Pyrex website but you don’t want to shock the glass by placing it in water after it’s become heated either. Even though the Pyrex dishes are oven safe, freezer safe and microwave safe, you never want to change the temperatures of these dishes drastically or else they will explode.

When glass changes temperature rapidly, it experiences thermal shock, a process wherein different parts of the material expand by different amounts. Sometimes glass vessels are unable to the stress of the uneven expansion resulting in a shatter.

Apparently Pyrex makes a ton of products that I was not aware of. When I think of Pyrex I automatically think Kitchen, Dishes, baking, bowls, fun colors, Pyrex measuring cups and I even think of those cute little Pyrex Vintage Butter dishes.

It was white glass with an avocado green design just like this one on Amazon. There are a few things I didn’t realize Pyrex was a part of.

I’m not so sure I will ever be able to look at a Pyrex bowl again without seeing those stained images in my head! Pyrex is microwave safe but under certain conditions it can explode or shatter.

This type of glass is harder and thicker than the other brands’ glassware, although there are some peculiarities of it that the manufacturer failed to mention on his official website. There are both pros and cons of using Pyrex for cooking and heating food in the microwave oven.

Many users find a standard Pyrex glass jug the most convenient when microwaving. It’s good to have a handle which allows to easily get the jug out of the microwave oven when the food is ready.

Also, if your recipe requires that you interrupt in the microwaving process now and then to stir the dish or add some ingredients in the middle of cooking, the Pyrex glass jug is a very good decision to hold and stir or whisk or pour in something. Google for “any microwave recipe in a mug” and use your Pyrex jug to cook it.

So the only manipulation with Pyrex glassware and the microwave oven that you should really avoid is the thermal shock.

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