Question on using volumetric flasks

[Rawnjohnson]

I’ve been home brewing for about 20 years, but always used beakers. Thanks to readalot, I decided to buy a range of volumetric flasks to improve accuracy. The question I have is on the mixing process. Do those of you that use volumetric flasks still mix in a beaker on your hot plate / magnetic stirrer, then transfer to volumetric flasks and add the last bit of carrier oil to the line? Or do you start off in the flask? I’ve read that volumetric flasks are calibrated at room temperature so I wasn’t sure about using it on the hot plate. It would also prohibit the use of my thermometer, and I’d have to use a temp gun.

 

[Duke309]

Do your measurements using the volumetric flasks then transfer to beakers for the stirring and heating.

 

[Rand]

You brew a large enough batch from the start

Use beaker, as little oil as you can to dissolve maybe half or a third of end volume

Fill vol flask, rinse beaker with oil but not exceeding total volume, all this go in the vol flask

After cool down, you can always top up

 

[Rand]

The thing is i see my kilobag and wonder how it's gonna fit into a 4000 ml vol flask.

I bought those before when i worked in the lab, i know the size

1000,000 mg/kg ÷ 250 mg/ml = 4000 ml/kg = 4 Litres per kilo test

 

[Photon]

Thank readalot

R

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Oct 31, 2025

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View: https://youtu.be/hrvXuX0Ow3s

5640-6L | PYREX® 6L Class A Volumetric Flasks with PYREX® Glass Standard Taper Stopper | Corning

These PYREX® 6L volumetric flasks provide improved lab convenience, broad selection and precise volume measurement. The strength of these flasks has been increased appreciably through machine-blown bodies to which are sealed heavy-tubing necks tooled for No. 38 Standard Taper pennyhead glass...

ecatalog.corning.com

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