Laboy Single-Neck Round-Bottom Flask, 1000mL, 24/40 Outer Joint

Very nice flask. The 1000ml is 50gm heavier than the other ones I have purchased. The flask walls feel noticeably thicker. Like another poster mentioned, it is slightly smaller in diameter, about .75 cm less. A much better choice for distillation of liquids that are known to have violent bumping.

By strange size, I mean the diameter is slightly smaller than 1L RBFs I've gotten from other manufacturers. They all fit my 1L heating mantle nice and snug -- this flask has a small amount of space between the mantle and flask when it rests on the bottom (~5-7mm at the top of the mantle). I just made some padding out of aluminum foil and it worked fine (still has a 1L volume, somehow?) In fact, this is the first 1L RBF I've purchased from Amazon that didn't break or even show any signs of cracking after distilling a molten mixture of NaHSO4 and NaNO3 to produce fuming nitric acid! I've run the process twice now in the Laboy flask with no visible damage whatsoever. Thank God! Previously, the flasks would crack, spilling a mixture of nitric, sulfuric, and molten sodium bisulfate all over the heating mantle, not only ruining the distillation but setting me back ~$200 to replace the flask and mantle - closer to 500 the first time, as i was using my nice, fancy mantle... RIP :( I debated naming any of the other flask brands that failed me, as I didn't want to step on any toes, but since it was such a very expensive and extremely hazardous failure, I will. DO NOT USE RBFs FROM VEVOR, YUXun, QINGYI, OR DESCHEM. At least not for anything but the mildest of heating/distillation processes! Laboy continues to impress. Spend the few extra bucks - it will save you a fortune down the road, not to mention a lengthy and hazardous cleanup. 5/5, will be buying more.

I got this in the mail and was at a loss for words. It was in a soft shipping package, wrapped in bubble wrap, and somehow it arrived in one piece. I have had boxed with foam inserts cut to the exact contours of glassware break in shipping and this hollow glass sphere plopped in a bag and made it here fine. The glass was noticeably heavier than other similar flasks and that likely contributed to its survival in shipping with basically zero protection. Not recommending the shipping method, definitely recommend the glass.

Thanks!

I recall when breaking glass labware meant an annoying bill from the store room manager, so I was dubious about the quality of chemical glassware coming from China for such low prices. Laboy exceeds my expectations--the glass is of a durable thickness, without ripples or "seeds" or inclusions, the ground glass mates perfectly with my American-made glassware (the grind seems a bit more coarse but to no disadvantage) and even though I haven't stress tested the flask (e.g., pouring liquid nitrogen into a flask at red heat--jeez, just kidding) I have full confidence that Laboy glassware will perform under normal lab conditions to the highest standards.

This is my first round flask. Nice heft to it, measured the connection joint and found it to be exactly 24/40, with a digital caliper or as close as could be to being imperceptible. Haven’t done much with it, just boiled water to check capabilities of other equipment.

I tend to order SEOH and Laboy most often for a majority of my experiments and products... Laboy isn't what you have probably come expect from a Chinese manufacturer. If you need glassware that just looks and feels like awesome quality--the answer is Laboy.. I love Laboy for their quality. When I need something that I expect to break like beakers I tend to get SEOH (their prices are excellent), but when I get something with the expectation of it lasting a lot of abuse then Laboy is absolutely the way to go. It's worth it to spend a little more on some things this flask is definitely one of those items.

It took a little longer than I expected for these to arrive, but they seem quite nice. The only thing I've done so far is check the fit with my heating mantle and they are slightly under size. That isn't a big deal in my case - the actual total volume doesn't have to be exact and they do vary between manufacturers. If I can remember to do so, I'll update my review with the actual dimensions. update: the measurement is a little tricky - my calipers don't have jaws that reach far enough to make it to the center diameter, so I had to find a different way to do it. I got 3.960 inches (100.6mm) for the largest diameter.

Very good for the price. It will do the job just fine.

quality product at a good price with speedy service ! It"s hard to complain about anything !!!!!! Thanks for the quality service!

it came exactly 1.5 months after ordering, which was the limit date before I could ask for a refund. The glassblowing is excellent, comparable to VWR pieces I've bought in the past for 4x the price. Shipping is the only problem. How does it take 34 days from the Chinese border to the Canadian border is unbelievable considering shipping isn't free. they should really get a better shipping company. glass is great but I won't be ordering again, this is just way too slow

The round-bottom flask has thicker glass for rugged use. It works well and the quality is good.

As described. Well packaged as it obviously spent time off road.