Labasics Glass 500ml 2 Neck Round Bottom Flask RBF, with 24/40 Center and Side Standard Taper Outer Joint, 500ml

Quality product

A lot of the more affordable scientific glassware takes a long time to get to the US from China, which is frustrating. These guys give good prices and everything arrives a timely fashion. Thanks!

I USE IT EVERY DAY IN ORG CHEMISTRY SYNTHESIS

You can connect directly to a 24/40 tapered joint with out an adapter. There is a lot of dead volume in the arms which may be a problem for some. The flask fits best in a mantle with the side arm vertical.

Perfectly blown glass

Great products great packaging

The price is great, but these """borosilicate""" flasks shatter from thermal expansion almost as easily as ordinary soda lime glass. I ordered 2 for hydrodistilling essential oils from herbs. The first one broke when I added about 50 mL of room temperature water to the hot (about 120° C / 250° F) glass all at once. Cracks formed along the bottom of the flask and leaked herb-juice all over my heating mantle. I tossed it up to an error of mine—maybe there was an error in the electric thermometer, and I should have added the water more carefully once the glass had cooled down. After replacing the heating mantle (which broke due to the moisture), I attempted the distillation again. This time I was much more careful, insulating the whole rig with aluminum foil to keep temperatures even, keeping it all at 100°C and only refilling it very slowly and carefully with water that was already scalding hot.Despite this, the second flask shattered and formed cracks just like the one before it. I was stunned. None of my other glassware has ever had this problem—just these flasks. Borosilicate Glass is supposed to withstand a temperature differential of 165° C (300° F), and the second flask broke with a 50-60° Celsius differential AT MOST. I don't expect the quality to be quartz, but this is absurd. Glassware should be tougher. The only reason I don't give 1/5 stars is that I got what I paid for: cheap junk.

Not bad for the price. Had a few very small bubbles. No issues holding vaccum under hi temps.Arrived quickly and was far better quality than the one that I returned from Stony Labs.

El matraz tiene buen terminado. Y se llego bien empaquetado.

Au delà, c'est du pyrex, et ce n'est pas le même prix. Format ok, verre ok (mais je ne suis pas monté à plus de 120°.

El producto es exactamente lo que la descripcion indica. Todos los pedidos de JD-Tech han sido plenamente satisfactorios.

The media could not be loaded. Io posso recarmi presso il punto di ritiro del reso essendo vetro rotto assenso ciao per riaver rimborso?

Ive had a few cheap flasks, and these are better than those by a little. I use them for essential oils up to 180c and so far so good. Necks are ground nice and the lip around the neck is thin enough for plastic clips.