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I have bought PYREX branded cookwares that claimed to be borosilicate, but are not actually borosilicate. You can't visually tell borosilicate and soda-lime ap
by nialv7 1y ago
I have bought PYREX branded cookwares that claimed to be borosilicate, but are not actually borosilicate.
You can't visually tell borosilicate and soda-lime apart easily. There is no difference in color (the green vs blue difference is because of other impurities). There is no significant different in refractive index. The only reliable test you can do at home is density (soda-lime 2.52, whereas borosilicate ~2.23, unit g/cm^3).
I measured my "borosilicate" cookwares and all of them are in the ~2.5 range. Turns out they just false advertise. A couple "made in China" beakers I got on Amazon turned out to be borosilicate though. Take that however you will.
- IshKebab 1y agoHow are you measuring density to that accuracy?
- chmod775 1y agoYou don't have to measure very precisely when the difference in density is that large and the item is relatively large and heavy. I'd be more concerned about some assumptions made. For instance I found that some alumino-borosilicate glass has densities that can reach above 2.5 g/cm³. I have no idea if you'd make cookware from that, but it's also a borosilicate glass...
- MattJ100 1y agoI'm curious about the method you used to measure this accurately at home.