Reddit reviews PTFE Magnetic Stirrer Mixer Stir Bars White Color,Olive Shape, (Diameter 8mm,Length 20mm),Pack of 10pcs
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Size: 8*20mmNumber of Items: 10Shape: Olives ShapeHigh temperature: up to 250 ℃Material: PTFE (Polytetrafluoroethylene)
That flat hotplate is not ideal for a RBF (Round Bottom Flask.) To use it more effectively, you might try getting a pot the size of the burner, or a bit larger, and filling it with sand. The sand gets hot and heats the flask relatively evenly around the bottom.
When your finances permit, look for a good heating mantle, preferably with stirring. Something like this: https://www.amazon.ca/Heating-Magnetic-HMS1000ml-Temperature-100-240V/dp/B07Z5KTW6P/ref=sr_1_27?keywords=heating+mantle&qid=1574245664&s=industrial&sr=1-27
Of course, then you will need stir bars, if you want to stir your reaction while heating. (You usually want this.) https://www.amazon.ca/Magnetic-Stirrer-Mixer-Diameter-Length/dp/B07461T2PR/ref=sr_1_1?keywords=stir+bar+olive&qid=1574245874&s=industrial&sr=1-1
And it would be good to use a jack to be able to raise the mantle to the flask, so you can lower it when you want to remove heat, and not have to move the glassware. Handling hot glassware is not a great thing to do for a variety of reasons.