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Nov 5, 2011 06:50 PM

Will it break? What's safe to put in a toaster oven?

Greetings Hounders. We recently replaced our toaster oven with one of those fancy Breville compact smart ovens. Then I read on the internet that putting oven safe glassware like pyrex or anchor hocking isn't recommend for risk of breaking even though it is considered "oven safe" up to 450 degrees. This is disappointing since it would be convenient to pull these containers out of the fridge and pop it in the toaster oven to re-heat leftovers. Since the internet is the un-disputed authority on dissenting opinions, I was wondering if any Chowhounders had actual experience popping some non-metal pan in their toaster oven and had it survive or break. So far, I've baked a pie in the Breville oven in a $5 stoneware pie dish purchased from TJMaxx and not only have it survive, but turn out a surprisingly beautiful looking pie.

So, based on your experience...did it break? Please specify if you were cooking or re-heating.
1) Oven-safe glass such as Pyrex or Anchor Hocking
2) Ceramic or stoneware
3) Terracotta


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  1. Greenbeanbun,

    In my experience, these oven safe glassware did not break. However, keep in mind that it is all about chances and different people have different tolerance of chances.

    "pull these containers out of the fridge and pop it in the toaster oven to re-heat leftovers"

    Even I am not against of using these glassware for baking. I wonder if putting something so cold with cold content inside a hot oven is a good idea. I can see this put a lot of stress for the glassware.

    1. Taking Pyrex out of the fridge and putting it directly into any oven is a recipe for disaster. I use stoneware in my Breville all the time. I do not put Pyrex in there, however, as there are too many breakage issues with current-generation Pyrex.

      1. Yes, I had a pie plate that I had used for years come out of my regular oven, and break. You can search this forum for discussions about this issue.

        I would never take a cold glass container of food and pop it right into a hot oven. That is asking for trouble. This goes for Anchor Hocking, Corningware, or Pyrex.

        If the ceramic or pottery is oven safe, it should be safe in your toaster oven. You would have to follow the mfg. directions on how to handle it, if it is going from the fridge to the oven. I have some handmade pottery which I do use in my toaster convection oven with no fear or problem. After all, pottery or stoneware is fired at a very high temperature in a kiln before being used. If the pottery or stoneware item is glazed, you should be sure that the glaze is lead free.

        Really there is no difference between what you put in your toaster convection oven and what you would put in your regular oven. The biggest concern for me was finding pans that fit.

        I hope you enjoy your new oven. I really use mine.

        7 Replies
        1. re: sueatmo

          It's true that pottery,stoneware,glass and ceramics are fired at high temp, but thermal shock is their biggest enemy so going from a 38f fridge to a 450 oven is asking for it, but you could put a cold(from the fridge) pan into a cold oven and let them heat up together , toaster ovens heat up way faster but it reduces the thermal shock.

          1. re: sueatmo

            I somewhat agree with Dave too. You are absolutely correct that ceramic and pottery are made at fired at very high temperatures, but if I am correct, glassware are also made from very high temperatures. Thermal shock is the biggest challenge for these bakeware.

            The problem I see for reheating a cold bakeware with food in an oven is that the interior surface contacting the food remains very cold. Yet, the exterior is being heated by the oven. Long story short, this is putting much more stress than heating the empty bakeware.

            1. re: Chemicalkinetics

              yes glass is fired/melted high temp but there is variations that are low temp throught the additions of hold your breath lead oxide, pyrex is made from the most thermal shock resistant glass available or used to be

              1. re: Dave5440

                :) Agree. Not all glasses are the same.

                The original Pyrex glasswares were made from borosilicate which is one of the most thermal shock resistant glassware. The current Pyrex *labwares*are still made by borosilicate glassware.

                However, most of North America Pyrex bakeware are now made from tempered soda lime glass – after Corning sold this brand to World Kitchen. Tempered soda lime glass is physically stronger, but has weaker resistance against thermal shock. You may find this video interesting:


                1. re: Chemicalkinetics

                  Great read, I love the comments below

                  1. re: Dave5440

                    I didn't read the comments until you bought it up. Man, people get very passionate about the crack industry. :)

                  2. re: Chemicalkinetics

                    Which is why we buy our glass cookware from EBAY (always Borosilicate glass).
                    -- from wikipedia ---
                    The European manufacturer of Pyrex, Arc International, uses borosilicate glass in its Pyrex glass kitchen products;[2] however, the U.S. manufacturer of Pyrex kitchenware uses tempered soda-lime glass
                    This means that Borosilicate glass cookware is still available, you just usually have to buy it from a non US source. I bought a double boiler that is the GOOD kind of PYREX last year (ebay).

                    Another HINT you can use is how PYREX is spelled. The old Borosilicate glass from the USA had the name in all upper case and the letter P had a vertical line on the left of the "P" that did not curve at the top (see included image).

            2. It is all about the temperature difference. If you let a dish come to room temp before putting in toaster oven it should be fine. Or, if you put something out of frig into toaster oven and then put it on to bake you should be fine because it will warm up as the toaster oven does.
              But to take something out of the freezer and push it under the broiler may well mean breakage.

              2 Replies
              1. re: escondido123

                you guys must really blast your leftovers. i've taken the anchor hocking out of the fridge and warmed up leftovers in the regular oven at 250-300 degrees for 10-15 min just before serving and so far no problems. Sometimes it does sit out on the counter for a while until I'm ready to stick it in the oven. As far as I'm concerned, leftovers just need to be re-heated, not scaldingly overcooked. it makes me wonder though about folks who pull these containers from the fridge and microwave them.

                Sueatmo - I've already been to several mfg websites and they don't address the use of their products in toaster ovens so there's no info there.
                One of the comments I've seen out there regarding oven-safe glass, ceramic, and stoneware in the toaster oven is that it isn't "recommended" due to the proximity to the heating elements, rather than the temperature itself. Yet, there are also contradictory comments.

                REDbeanbun (you know who you are)

                1. re: redbeanbun

                  There shouldn't be any difference, which is what I tried to express in my earlier post. Toaster ovens bake. Regular ovens bake.

                  I wouldn't take a cold glass OR ceramic container straight out of the fridge and put it into a hot oven. However pottery or ceramic ovenware has been fired at a high temp, and should be OK in a pre heated oven, assuming it hasn't just been taken out of the fridge or freezer. Glass seems to be a marginally safe product. There have been lengthy discussions on this forum about this issue. Consumer Reports has written about this issue. Some folks have had bad experiences with shattering or exploding Pyrex. I have had an old Pyrex shatter after taking from the oven. The mfg. seems to say that "bruised" glass can shatter. I won't use the stuff for conventional baking. The Pyrex issue is well known.

              2. I have not heard of there being any difference between a regular and toaster oven regarding glass ovenware. I use mine a lot in the summer to avoid heating up the house with the A/C on.

                2 Replies
                1. re: justicenow

                  oh that a slab of bacon cooking in your toaster oven? i'm thoroughly impressed.

                  1. re: redbeanbun

                    Pork belly sitting on root vegies. The parsnips were like candy. I have one chunk of belly left in the freezer. Looking at the pics make me want to get it out.