1000ml Narrow Mouth Erlenmeyer Flask, 3.3 Borosilicate Glass, Karter Scientific 213G22 (Single)

This 250 mL narrow-mouth Erlenmeyer flask is excellent — the kind of product that really earns its place in your lab, workshop, or studio. From first use, it’s clear this isn’t a flimsy bucket-brand knockoff but a well-made piece of lab-grade glassware. What Sets It Apart: 🔬 Superior Glass Quality: The borosilicate glass feels solid and durable. It’s clear with crisp volume markings that are easy to read, and it hasn’t shown any signs of clouding or scratches even after multiple uses and washes. 📏 Accurate Measurements: The 250 mL capacity and graduated markings are precise and reliable, making it great for experiments that require consistency — whether you’re measuring solutions in the lab or mixing custom cleaning solutions at home. 👨‍🔬 Narrow Mouth Advantage: The narrower mouth minimizes evaporation and splash-out, and it’s wide enough to add liquids comfortably. It’s also easy to pair with stoppers, rubber bungs, or adapters if you’re building more advanced setups. 🧽 Easy to Clean: Smooth interior and exterior surfaces make rinsing and scrubbing a breeze — no stubborn residue left behind. Practical Uses I’ve Tried: • Chemistry experiments and titrations • DIY tinctures & botanical extracts • Brewing small batches of kombucha or herbal infusions • Art projects and resin mixes • Organized storage for small liquid batches Pros: ✔ Durable and very thick borosilicate glass ✔ Accurate, easy-to-read graduations ✔ Versatile for science, craft, or home use ✔ Easy to clean and maintain Cons: ➖ As with all glassware, handle with care — but with gentle treatment, this flask will last for years. ➖I also wish there was a durable rubber stopper at the stop to trap fumes if needed. This is a quality piece of glassware worth every penny. Whether you’re outfitting a lab, starting a DIY project, or need precise measurement tools, this Erlenmeyer flask delivers performance and reliability. Highly recommend! 🧪✨

Thicker glass and better quality than previous models.

The volume graduations are labeled +/- 5% accuracy, which is standard for this product. Mine was much more accurate than this as measured by a volumetric flask. If such measurements are important to you, you should measure it to know how true the graduations are. The flask stood up to its first applied gas flame when I used it to boil water for tea. One does not need the Pyrex brand name to get an excellent flask. The product itself was excellent, but watch out for that Amazon delivery. They left it on my outside doorstep, right in the path of the swing of the door. If I didn't know that the package arrived and looked al the picture showing the delivery, I probably would have opened the door, sending the flask bouncing down the step to break when it hit the bottom. I had to use another door to go outside to get the package. Amazon should tell its delivery people not to leave ANY package in the swing-space of the door. It is inconvenient for regular packages, and it could lead to breakage for fragile contents. One would think that should be obvious to the delivery personnel, but alas not!

Nice heavy glass, made in Lake Charles, LA, United States of America! The volume marks on an Erlenmeyer flask only claim to be approximately accurate, but I've found them to be plenty close enough to fill my coffee port reservoir to exactly the 1 litre mark. Highly recommended. A great value for the very reasonable price!

Decent quality some minor flaws and unevenness like the bottom not being completely flat and the rim being a little wonky looking and the size of the opening not being consistent but overall a very good deal. The stopper size for the 5000ml is #9 I couldn't find that information here or on the manufacturer's website so I had to wait until I received them and then manually measure them and then order the stoppers and then wait again until I received the stoppers before I could use them so it would be nice if it listed the the stopper size.

Overall, I am happy with my purchase. The glass of this flask is thicker and heavier than the one I am replacing. Be aware though that with the thicker glass, it has a smaller stopper size. In my case, I have a custom silicone stopper I use, but it was too large to use with this flask. I was able to modify the stopper that was included with this flask for my purpose, so I am able to use it. Some comments mention the bottom of the flask. I suspect that the larger the flask, the greater the chance the bottom is not flat. With the 1000ml, the bottom of my flask is flat and works well with my stirring plate.

Everything was great - arrived on time - works - perfect

Strong glass dropped will resist to a point hitting hard surfaces. Concrete bad wood better