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Floyd YesterZep
Bewertet in den USA am29. März 2025
These are what I would consider professional grade glassware. It’s so nice to receive such good quality, in a world where your expectation is that 9 times out of 10, the item purchased won’t live up to what was advertised or expectations. You don’t have to worry about that here. The glass is heavy walled and I could not find a single flaw in either flask (with the cheap generic stuff, there is always a flaw are two).Sometimes I forget that trying to save a few dollars by looking for a good deal never works out. It’ll arrive and might work for a few times but in the end, they always break. So I end up having to buy more, which will again break and if I’d just spent a little more on the front end, I’d have had good quality glass that I don’t have to worry about. And that’s exactly what we have here…Stony Lab is as good as you’re going to find on Amazon. Every piece of apparatus I’ve bought with the Stony Lab label is still doing its job, unbroken, and dependable. I don’t have to worry that my reaction is going to end up all over the floor because I accidentally bump a flask against a beaker. Or an unseen flaw is going to cause a beaker to crack when heated.This is because they are made of thick, heavy borosilicate. You can even hear the difference if you tap the sides with a fingernail. Stony Lab flasks make a nice solid ping whereas the generic flasks sound more like a ‘doink’ and feel like you could break them just by doing so. Not these, these are solid. Also, the packaging is top notch so you don’t have to worry about it arriving broken and can be reused for storage if you want.I don’t know what else to say. The Stony Lab name speaks for itself. You know that you are going to get quality glassware and other apparatus from this company. I know the front end cost is a little higher but I promise in the end, it is worth it. As I said before, I’ve spent so much more money trying to save a few bucks than I ever would have had I just bought this level of quality to start off with.
That person
Bewertet in den USA am1. Mai 2025
This is good quality glass. The size is good and it cleans up easily. Decent enough price for lab glass.
Doug M.
Bewertet in den USA am6. April 2025
The memory of Emil Erlenmeyer lives on, at least in every chemistry lab in the world, by virtue of the wide-bottomed, narrow necked flask he invented in 1860, and named after him.We aren’t doing any titration around here; the days of college chemistry classes are long gone. We use and enjoy lab glassware as a household item, with the Erlenmeyer Flask the perfect individualized serving vessel for wines and tea. With their wide bottom and narrow neck, they make the perfect wine decanter; once the wine has been poured into the flask, it can be conveniently aired by swirling without the worry of spillage. Since the Stonylab Flasks are made from borosilicate glass (silica and boron trioxide), they have very low thermal expansion, allowing them to withstand a temperature differential of up to 330℉ without fracturing. Their use in the lab for measuring, mixing, transporting, storage, cooling, and boiling liquids applies just as adeptly to the home kitchen.Although plenty of kitchenware is made from borosilicate glass, we like the techno-lab aesthetic of lab dedicated glassware, including beakers, flasks, pipettes, graduated cylinders and what have you; it’s also convenient that most pieces are graduated for measuring liquid portions. Another benefit of labware is that it’s generally thicker and more robust than glassware made specifically for the home kitchen, which is true of the Stoneylab Erlenmeyer Flasks. Also, the borosilicate flasks can be heated directly on a stovetop burner. The Stonylab flasks aren’t provided with stoppers, but they’re available and make a useful addition to the flasks when storing liquids in the refrigerator. The lip of the flasks is thick and beaded, just as they should be to be stoppered.For our kitchen use, the Stonylab Flasks are just what we look for; they’re graduated, made of thick borosilicate glass and at 500ml+, just the right size. As of now, I have nothing to criticize about them. Please bear in mind that we don't use these flasks in a lab setting, so if that's your purpose, other reviewers are likely going to be more helpful.
Walter
Bewertet in den USA am9. April 2025
My young apprentice, Jesse, doesn’t know a volumetric flask from a boiling flask. Of course he doesn’t. He thinks you can use a volumetric flask for mixing or titrations. That’s half right—which is to say, dangerously wrong.Let me clarify—because someone has to:A volumetric flask is not for mixing. It is not for heating. It is calibrated—precisely—to contain a fixed volume at a specific temperature. One line. One job. Deviate from that, and you’re not doing chemistry anymore. You’re guessing. No chili powder adulterants. Please.A boiling flask—round-bottomed—is what you want for heat. Uniform thermal distribution, especially during reflux. You don’t cook in a volumetric flask any more than you’d fry an egg in a graduated cylinder.A Griffin beaker? That’s a glorified cup. Good for splashing. Not for precision.The Kjeldahl flask—rare, specialized, beautiful. Most people don’t even know what it’s for. Jesse certainly doesn’t.Now this—this is the Erlenmeyer flask. The lab’s workhorse. Conical, stable, heavy-walled borosilicate glass—thick enough to handle moderate thermal stress. Autoclavable. Durable. Resistant to most acids and bases. The 500 ml size is practical, versatile, and accepts a standard #7 rubber stopper (not included, of course—don’t ask).The graduations? Accurate enough for rough work, but don’t pretend it’s calibrated. It isn’t. That’s not the point.This is the flask you grab when you need to swirl a titration, boil off a solvent—or for Gale, decant the morning’s caffeine extraction.Me? I’ll be using it to aerate wine. Because chemistry belongs in the lab… and sometimes, on the table. Because chemistry… is also elegance.
Zed
Bewertet in den USA am19. April 2025
I was really impressed with how this came, it was nicely boxed packaged in a way that I don't see it shattering. In fact, I've just kept the box and the way it's stored because I'm pretty sure that my luck I would knock these off a table... However, if I did I'm not even confident that they would break. The glass is so thick. It's not like some of that cheap glassware you see around, seriously, I've had my fair share of glassware of this specific type and I got to say this beats out a lot of the other brands I have seen in terms of thickness and in terms of accuracy.I can't speak on the heat retention or any of the factors in terms of thermal capacity. However I can say I'm sure it would function just fine as it seems like it's thoroughly at borosilicate glass... There were no bubbles throughout the entire glass. This seems like incredibly high quality. If not, one of the best qualities you're going to be able to get without a license to handle chemicals and access to a specialized dealer of laboratory products. Overall, I'm incredibly impressed with this.
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