Review on Laboy Glass 500ML Single Neck Round Bottom Boiling Flask Heavy Wall With 24/40 Joint Heating Reaction Receiving Flask Organic Chemistry Lab Glassware by John Camelio

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 Revain 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.