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(More customer reviews)Posted elsewhere and added here for others:
New measuring cups are heavier because it's NOT PYREX anymore! After 1998, when Corning Glass stopped making Pyrex. (Think fiberoptics and bankruptcy, etc.) They sold off their 'household' glassmaking and it reformed as World Kitchen. PYREX is borosilicate glass and very resistant to wear and chip and cracking due to exposure to heat or quick changes in temperature. This is why Pyrex and Kimax other borosilicate glasses are used for chemistry glassware. (Timex was to watches as these were to chemlabware! Takes a lickin' and keeps on tickin'!) Corning has licensed the name of 'Pyrex' to World Kitchen, but nothing else about it is 'corning glass'. (As an aside - Corning made great glass - of all kinds. A world-beater in their day. Management screwed them over going down the wrong economic road. Do check out their lovely glass museum in Corning, NY!) NOW, World Kitchen makes their 'pyrex' measuring cups out of ordinary soda-lime glass (kitchen drinking glass type). This is NOT safe to expose to heat changes!!!! (Think wear safety goggles - like you WERE working in a CHEM LAB!) I suspect that soda-lime glass is denser than borosilicate, but the actual measure wall thickness may be different now than before, and, thus, this accounts for some of the weight difference. If you want my opinion - find 'vintage' Pyrex Measuring Cups somehow and they will last multiple lifetimes. I have one of my mom's and she has two of her mom's measures. My new ones cannot hold a candle to the old ones (30 to 60 years old) and aren't worth a tinker's damn. Happy times in the kitchen!
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