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Your cart is empty.Heavy wall borosilicate filtering flask includes a heavy-duty rim and a bolt neck with tubulation. Graduations are printed in durable white enamel. Manufactured from low-expansion Type 1, Class A Borosilicate 3.3 glass that complies with ASTM E438 Standard Specification for Glasses in Laboratory Apparatus. It is low alkali glass with a typical chemical composition of approximately 81% silica, 13% boric oxide, 4% sodium oxide, and 2% aluminum oxide. It is virtually free of magnesia-lime-zinc group, and contains only traces of heavy metals
Bill
2025-07-06 20:03:01
Very good quality
Customer
2025-06-12 11:05:40
Update 1/3/18: We had 2 of these break this morning. Both in the same place, along the sidewall on the bottom, while cleaning. Don't do it; the glass on the sidewall is thinner than a ball jar. We found a Chinese brand that is cheaper and thicker glass. If you can afford it, just get the Pyrex 4L version, which has very noticeable heft compared to this flask.Original review: Had one that lasted for 6 months of continuous use (which is fairly reasonable), but then I had some really poor experiences. Got one that cracked on the bottom weld during the first time under vacuum. Had another crack in the same place after a little use. Got a replacement that was packaged with no padding and a torn box, so that went back because it wasn't worth the risk, and even got a replacement which was actually the exact same cracked one I sent back in originally! At this point Amazon pulled the remaining ones from the website and ordered a new batch. I opted for a refund.These are a great price, but my glass blower friend says they must not have annealed this batch properly.
Matthew E.
2025-05-30 17:10:51
I have had a total of 4 of these so far...The first lasted around 6 months, before a lab assistant cracked it....We just got 3 in.1st cracked on the bottom weld seam at 20in mercury vacuum (nowhere near full vacuum).Other 2 are working well (fingers crossed).
LAB TECH
2025-05-22 15:01:29
This product imploded under mild vacuum and shot glass shards through out my whole lab. I am so lucky that no one got hurt. I just spent the last 2 hours cleaning up tiny pieces of glass from up to 15 feet away. Picture of what is left of it. I thought it felt too light. It is a cheap piece of crap. I would have left Zero stars but it made me pick one.DO NOT BUY - CHEAP PIECE OF DANGEROUS GARBAGE - SELLER SHOULD BE SUED. UNFIT FOR ANYTHING EXCEPT POSSIBLY A FLOWER VASE IF IT WAS CONTAINED IN A BOX, AND I WOULDN'T LET IT ANY WHERE NEAR MY HOUSE
Gregory R Landry
2025-05-13 11:23:00
After 3 months of use filtering cold liquids, bottom fractured around almost the entire bottom of the flask. I note that there is nowhere on the flask that indicates it is borosilicate glass, while my other flasks all have this marking.
Customer
2025-03-16 12:13:55
I bought this and #12 drilled rubber stopper, BUT #12 was little bit small for this. Because inside diameter is not 2.25", it is 2.36". #13 drilled rubber stopper is suitable for the one I got.Or you should buy a rubber stopper after you get this flask...
Alexi
2025-03-13 18:10:22
I ordered one of these in September and the flask exploded one day when under vacuum. Luckily, no-one was injured. We had success with this flask for about 2 months of filtering. These should be packaged with padding--not just placed in a box--and also these should be examined prior to shipping out. Not worth the risk when making this purchase.
Pierre
2025-01-12 14:14:57
Imploded violently under vacuum using a regular small diaphragm pump during routine filtration. The bottom of the flask just lifted-off. I never seen that during my 25+ years of work and research in chemistry.
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