Magnetic Stirrer Stir Bar PTFE Magnetic Mixer Stir Bars (9x25mm, Olive Shape, 10pcs)

I bought the Cole-Parmer 37130-9003 Egg-Shaped Stir Bar, 3" L x 3/4" Dia; 1/Pk in April for $43.83. And it has worked well. But when I couldn't find it last week (since found), I ordered this very similar stir bar. Hands down, this iitem performs better. It's heavier, bigger, and thus mixes more. This magnet is significantly stronger. It will move itself to the magnetic center above the magnetic stirrer if the I place it anywhere close to that location. Also, this stir bar can handle a significantly faster rate of rotation per minute without spinning out. I got it up to 400 RPM, mixing lye into 4L of water, and had no interest in going any faster. I am assuming this stir bar will last for a good while, given the material of its composition. I will report back if any problems arise in that regard. At the moment, I am tickled pink. Update: This stirrer is also significany quieter than other stir bars I have used. Once it gets up to speed, I have to look at the surface of the liquid being stirrer to verify that it is being stirred. I received no compensation or benefit for this review.

These are extra "pills" for my magnetic stirrer, Perfect for my needs, I use them to vortex oxygen into my drinking water, also I use them for stirring my coffee, I use powdered milk and a tablespoon of honey, and these are the perfect size for a coffee cup, ads oxygen to my coffee also! Water Vortex machines can cost hundreds of dollars, but these magnetic stirrers are cheap and do exactly the Same thing!!!

Why did you pick this product vs others?: great when you have a lot of sediment to stir in your extraction that causes typical stir bars to become over encumbered and pause, no longer stirring. Soap nuts, arnica, ashwaghanda even zinc oxide is no challenge for these stir bars, provided you have the right amount of transport medium/solvent (Water, alcohol or oil)

On the plus side, the plastic coating does appear to be PTFE - it's slippery and not affected by hot, concentrated sulfuric acid. On the minus side, the magnet was demagnetized at 140C (but not at 120C), so the claimed temp rating of 250C is pure fantasy. Still, I paid just as much for a single egg-shaped stir bar with a genuine AlNiCo magnet (that is actually good to 250C) so I give these 3 stars instead of just 1 or 2. They work, but don't meet claimed specs.

They work as intended and are an excellent price. I'm very satisfied with this purchase.

I use this to blend very thick (like mayo at blending temps of 125f) mixtures on a magnetic stir plate, it works well when the flat side lies on the bottom of the beaker. The size and weight are very good, but the outer sheathing could be a bit stronger

I wanted a larger bar to stir a big cylinder. All three could not stay on the plate. They just spun onto their tip and then flew off the center.

I got this because it’s almost the exact same size as the one for the Corning PC-611 and it seems to work perfectly. It’s a fraction of the cost too!

Quality issue