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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
LAB TECH
Reviewed in the United States on April 28, 2021
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
Pierre
Reviewed in Canada on April 24, 2021
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.
Gregory R Landry
Reviewed in the United States on March 5, 2019
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.
Matthew E.
Reviewed in the United States on January 16, 2019
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).
Alexi
Reviewed in the United States on November 30, 2018
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.
Bill
Reviewed in the United States on November 14, 2018
Very good quality
Customer
Reviewed in the United States on March 3, 2017
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...
Customer
Reviewed in the United States on January 23, 2017
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.
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