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Making your own lab instruments | Gifts for Geeks said in June 17th, 2011 at 7:01 AM

[...] Mikhalchuk] is trying to gather a base set of lab instruments. Specifically, he’s looking for hardware that will let him quickly filter solids out of a liquid. He first started by adding a cotton disk to a plastic funnel. It does the job, but when left to [...]

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bob said in June 18th, 2011 at 11:31 AM

This is cheap water pump, you plug it to water, and you have under pressure

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Andrey Mikhalchuk said in June 19th, 2011 at 4:02 AM

Thanks Bob! How much is it?

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Ventura1889 said in July 24th, 2011 at 12:55 PM


Once you find a vacuum flask and a Buchner funnel, you will notice two important features:

1.) the flask walls are twice as thick as your typical Ehrlenmeyer flask

2.) like virtually all lab glassware, it’s Pyrex.

Vacuum flasks must be tough(er) to resist implosion/explosion due to vacuum. Even small pressure differences (multiplied over the total surface area of the flask) can generate very large forces!

In general, avoid lab glassware that has obvious cracks, nicks, scratches, or wear. Seemingly minor defects can cause glass to fail catastropically when under any kind of stress — such as pressure or heat.

Be safe!

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Andrey Mikhalchuk said in July 28th, 2011 at 12:01 AM

Ventura1889, thanks for good comment and useful information.

Fortunately the vacuum pump made of bike pump is not powerful enough to collapse even regular Ehrlenmeyer flask, so this particular setup is safe, though not as efficient as pro-grade (and expensive) pumps and flasks.