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2 Vintage PYREX #229 - 9 1/2" Pie Plates - $11 (Sequim)
condition:
excellent
make / manufacturer:
Corning Ware
model name / number:
PYREX #229
size / dimensions:
9-1/2"
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What Is PYREX?
First of all, let's start from the beginning. Three basic types of glassware are typically found in most home kitchens: soda-lime, tempered, and borosilicate. Borosilicate glass includes boron trioxide, which has a low thermal expansion. This suggests unlike normal glass, it won't break when exposed to major temperature shifts such as taking a dish from a fridge to an oven. This is thanks to boron trioxide, the element that makes glass resistant to major temperature changes. PYREX is a sub-group of borosilicate.
Are "PYREX" and "pyrex" the Same? And What Does This Mean?
If the logo is in upper case lettering, PYREX, it's most likely made of borosilicate, and thus safer. The lowercase lettering is most likely made of soda-lime glass, so take extra care after any high-heat cooking. Most glassware products will include warnings so make sure to read about proper handling, cleaning, and storage.
PYREX is a higher quality product than pyrex.
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