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While an oven preheats, the heating element or gas burner will be running at full output. For an electric oven in particular, this will generate a great deal of radiant heat. Radiant heat increases the temperature of the objects it shines on, without directly changing the air temperature. So, if you place a pyrex dish in a cold oven and then turn it on, ...


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As Fabby says, it must have something to do with a sudden change in heat. An hypothesis: they misinterpreted the French original written by Pyrex. It says, again thanks to Fabby: Assurez-vous de toujours préchauffer le four avant d’y mettre votre plat en vitre. This means, "make sure to always preheat the oven before putting in your pan". It could be ...


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That's just a precaution to extend the life of your Pyrex glassware. Transliteration from the French original: Some precautions: Plates in Pyrex glass can be used to heat and reheat food, in the oven or microwave oven, if you take a few precautions: Avoid sudden changes in the temperature of the glass. Ensure to always preheat the ...



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