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Your cart is empty.Karter Scientific Erlenmeyer Flasks are designed with heavy duty rims to reduce chipping. Their uniform wall thickness provides the proper balance between mechanical strength and thermal shock resistance. Approximate graduations are in durable white enamel. An extra large marking space is also provided. Rubber stopper included. High quality inert 3.3 borosilicate glass
Sirhc Tnra
2025-08-06 10:04:49
Does what I need it to do.
Eric M.
2025-07-30 12:31:39
I bought this to do yeast starters for beer brewing and it's perfect. I used on direct flame to heat up and then chilled directly in an ice bath, as I have done with my other Boro 3.3 flasks and there were no issues. The bottom is flat, which works perfect with a stir bar/plate. I would recommend to anyone looking for a quality flask.
"J"
2025-07-16 18:38:51
The media could not be loaded.
Jeremy N.
2025-07-12 17:23:01
It's a good flask, the stopper works well too, not sure how it would fair against solvents though so it would be wise to ask the seller if that will be a concern. Aside from that, I can say it is borosilicate glass that is what you would expect from lab equipment. Sturdy and thick, no complaints here.
Angel75c
2025-07-06 17:24:38
The look and feel of the equipment is good. However, only one of the stoppers fits properly in one of the flasks. In the smallest bottle one of the stoppers falls in, another is too big to fit at all, and the third stopper gets snug as it becomes flush with the top of the flask. (very difficult to remove)The two smallest stoppers fall inside the two larger flasks. The middle flask is actually larger mouthed and the largest stopper nearly falls to flush in that flask as well.The largest bottle has the second largest mouth and fits the largest stopper well. Unfortunately this leaves two of the flasks without stoppers. As well as two stoppers that make great floats.Of course your mileage may vary.According to the size chart on Sciencecompany.com this set should have been shipped with sizes 5, 6, and either 6.5 to 7. Not sure of the size for the largest flask. I think either might work for the largest mouthed flask.Quick update: I have been doing a little research about these flasks, Karter Scientific 214U8 and the reference set listed on Amazon without the stoppers Karter Scientific 214U2 indicates the mouths of the flasks as follows: 50ml: approx 17mm, 150ml: approx 22mm, 250ml: approx 25mm. These numbers are not accurate for the set I received. The mouths were instead as follows: 50ml: approx 26mm, 150ml: approx 31mm, 250ml: approx 28mm. If the flasks were sized as described in the Karter Scientific 214U2, I believe the stoppers that shipped with this kit, would, in fact, fit correctly. So I do not know which is wrong but now suspect I was sent the wrong size flasks, or the flasks mouths have been redesigned to be larger, but the stoppers that come with them were never switched to larger sized stoppers. Don't know which, but clearly something is rotten here.
Swamp
2025-06-18 14:07:34
The glass on these is very thick and should stand up to years of use. The stopper is airtight and holds my airlock fine. I use these for yeast starters and yeast "ranching" various cultures. Highly recommended.
le Bunk
2025-06-12 09:13:29
Overall I am satisfied with glassware. Aside from very minor imperfections and finding a large chunk of glass in the 250ml (which scared me as I thought the flask had broken during transit... luckily it was from an unknown source), the glass arrived quickly and as described. The #2 rubber stopper on the other hand was less desirable. The larger stoppers fit well but upon dropping the #2 into the top of the 50ml, it sat down unusually low. I gave the stopper a little press downward to check for a seal (and I'm talking very minimal pressure) and instead the stopper just slid down inside the flask. Perhaps the stopper decided to resize itself correctly once inside the flask (lol) as attempts at retrieving it were futile. That said... I'm still giving a rating of 4 stars, as the set, even minus one, is an amazing deal.Edit 10/20: And 5 stars it is. Thank you Amazon for being amazing and making it right. Never dissatisfied with Amazons customer service.
A.L
2025-05-12 15:40:59
I ordered these for my husband for Christmas (he specifically wanted these really bad for his little experiments/hobby) and he was so excited to start using them. He specicially held up the biggest size flask and said "OMG! this one is perfect! AND it comes with tops for them!?" HOWEVER, when he went to put the rubber stoppers on top of the flasks, only the really small one fit.... The rest fell right through and into the bottom of the flasks!I was so embarrassed and felt so bad for him because he was so excited to use these but has only ever been able to use the small one.Such a shame.....
Ryan schroeder
2025-04-06 10:30:45
Great value
Dr. C. Hom
2025-03-31 12:40:42
I'm buying more
James T
2025-03-28 17:46:28
Glass ok but the stopper is too small and falls inside, should have paid the same price and got a better quality product without a stopper.
Keven
2025-02-25 18:06:04
Produit correct mais il n’y a pas de bouchon avec les flacon
CovaraC
2025-01-01 16:46:12
The smallest cap is bigger than the smallest glass so it doesn't fit.
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