Thread Number: 78734
/ Tag: Recipes, Cooking Accessories
Pyrex Revisited... |
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Post# 1027264 , Reply# 2   3/17/2019 at 05:08 (1,879 days old) by foraloysius (Leeuwarden, Friesland, the Netherlands)   |   | |
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Post# 1027279 , Reply# 3   3/17/2019 at 09:05 (1,879 days old) by combo52 (50 Year Repair Tech Beltsville,Md)   |   | |
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I never heat anything in Pyrex type glass, in fact I hardly own any Pyrex, Why ? with stuff that can break so easily if heated or handled improperly when there is so much Corning-ware around, I probably have several hundred pieces if Corning-ware cook ware that I use in the ovens and microwaves and occasionally on the stove top.
John |
Post# 1027714 , Reply# 6   3/22/2019 at 16:35 (1,873 days old) by kb0nes (Burnsville, MN)   |   | |
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It all comes down to the coefficient of thermal expansion of the material. All glasses are equally "heat resisting" as they all melt at more or less the same temperature. It is when glass is exposed to gradients of temperature causing part of it to expand or contract that internal stresses build causing breakage. Don't set any piece of oven-hot glass on a wet washcloth or you risk breakage no matter what it is made of.
Borosilicate glass is QUITE different from other glasses as its coefficient of thermal expansion is 1/2 to 1/3 that of other common glasses. This is the reason that lab glassware can endure the thermal shock that it does. Note that lab glass is generally pretty thin which is an advantage when dealing with temperature extremes, thin glass probably won't hold up as well in a home environment though due to handling. The fact that the word Pyrex appears on a piece of home kitchenware DOESN'T mean it is borosilicate! Even back when the Pyrex name was owned by Corning there were pieces that were still tempered Soda Lime glass. Now that it is a World Kitchens name the use of borosilicate at all is over. As long as the heating is uniform and the piece isn't allowed to have serious temperature differential anywhere across the piece any glass will survive just fine. But for safe home kitchen use the choice of Corning Pyroceram is the wise choice, you won't hurt this material no matter what you do with it. Visions was mentioned also and this material is quite different from borosilicate glass also, it is far more comparable to corning pyroceram. I'm with John on the Pyrex in general, measuring cups and a couple of mixing bowls are about the only Pyrex I own and I don't heat it any of it. Corning pyroceram is DIRT cheap in the thrift stores and a much better in the oven. The following video is fun to watch. Note that while they call the piece they are using Pyrex, it isn't borosilicate |