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Why did my Pyrex dish explode? [Infographic]

All about why Pyrex glass explodes

Why did my Pyrex dish explode? infographic

Many people don’t know that there’s two types of Pyrex glass, one with a 10 year warranty, and another that will explode with rapid temperature changes. This is my first Buy It Once infographic and it’s all about why Pyrex sometimes explodes. It was a lot of effort to make, so if you like it please share it 🙂

Any comments are welcome.

Edit: Thanks to all the visitors from Reddit! It was fun reading all the comments.


  1. Commented on

    This is awesome! The infographic is really helpful. I run across Pyrex a lot at thrift stores and tend to stay away. I don’t like having to ship glass, but I know the older stuff is really popular. I didn’t realize that you could just take it right from your freezer and put it into the oven!

  2. Commented on
    Comment by Lorenzo

    Corning Inc is labeled “shatter proof”, yet the text indicates they switched to soda-lime glass in the 1980’s. Shouldn’t it also have the “new pyrex” label since that’s what it’s currently making?

    1. Commented on
      Comment by buy-it-once

      That’s a little confusing. Corning Inc. no longer make Pyrex for cooking glassware, but they did retain the rights to make Pyrex laboratory glassware which is still made with borosilicate glass. Most authoritative sources say that the change happened in 1998 when Corning Inc transferred the rights to manufacture Pyrex to World Kitchen. Other sources claim that the USA glassware industry at large changed in the 1980’s. The infographic isn’t as clear as it should be on that point – good spotting.

      Corning Inc. have been really serious about glass for over 100 years. They also developed Gorilla Glass, the glass that’s found in most smart phones. Their new “shatter proof” glass that’s getting headlines is called Gorilla Glass 4. There are rumours that Apple is interested in using it instead of sapphire glass for the iPhone 7. We will have to wait and see.

  3. Commented on
    Comment by Otto

    I didn’t even know this.
    Uppercayse Pyrex, uppercase pyrex, uppercase pyrex.
    Okay, that will make sure it sticks in my brain.

  4. Commented on
    Comment by Hexe Patty

    Grateful that I have hand me down Pyrex casserole glassware from husband’s deceased mum. It’s all circa 50s & 60s no doubt. Thanks for lesson!

  5. Commented on
    Comment by Diane MacEachern

    I’m glad to know about you! Could I have your permission to repost your infographic on, with all attributions to you and a direct link back to your blog? Thanks.

    1. Commented on
      Comment by buy-it-once

      Yes, absolutely.

  6. Commented on
    Comment by Rachel

    I was taught that you put cold Pyrex in a cold oven and let it heat with the oven. Is this also no longer true?

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