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Red
Reviewed in the United States on April 3, 2025
Purchased a set of eight 500 mL borosilicate Erlenmeyer flasks. Build quality is consistent with other well-made lab-grade flasks of this volume—good glass thickness, not fragile, no concern clinking against metal or glass surfaces. Used across several applications; holds up well to thermal cycling (heating/cooling). Cleaning is standard—no easier or harder than typical flasks.Stopper compatibility:• #6 fits perfectly.• #5 too loose—doesn’t seal.• #7 can be forced in, but only inserts ~1.5 cm—suboptimal seal.If they’re restocked (I grabbed the last set), I’d repurchase immediately—especially at the price offered.
Brent Daly
Reviewed in the United States on May 11, 2022
They came in a box with individually packed and in a foamed box for each flask. I have used them for refining and distilling acids and bases up to ~120°C and had no problems with thermal shock, cracking, or any other heat induced problems with a thermal gradient as much as 80° from top to bottom. They hold above their rated capacity so you have a little breathing room if you deal with liquids that expand drastically when heated. If I need flasks again in the future then I would buy from these people again. Pictures above are at just above 100°C with an Iron acetate solution with other components. Always perform refining and distilling in well ventilated areas, and wear propper PPE.
Nadia Al-Kahlout
Reviewed in the United States on October 1, 2022
I used these to make spooky season adult drinks, very fun changing color of drinks in these flasks. If you are going to use it for drinks though I suggest going a bit smaller than 500ml, most drinks don't fill it up. Opening is wide enough to fit ice in as well.
Customer
Reviewed in the United States on October 24, 2019
Work well for yeast step starters.
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