Buchner Funnel filter papers

[Blackened]

Hey all,

I was just digging through my cupboard 'o goodies and found a funnel I bought years ago. Is there a particular type/grade/spec of filter paper I should be looking for? Other than the diameter of course. I'll be using it for many and various filtering purposes, charcoal, citrus peel, coffee and all that jazz.

Cheers all

[Sam.]

I would have thought coffee filter papers would all be fairly similar :handgestures-thumbupleft:

[hillzabilly]

I use coffee filter papers ,available at most supermarkets ,you may have to fold the edges to fit the funnel .they come in small and large size.The other thing I found when filtering is if the product is thick or syrupy it will take ages ,so I bought a perforated funnel wich with the papers took less time, hope this helps.cheers hillzabilly

[SBB]

Some things can be a bastard to filter......progressively finer filters help a lot.......I wouldn't start off with anything to fine.

[Blackened]

Thanks all,

Yeah a Buchner funnel is a funnel that has a flat perforated divider above the funnel, with a short cylindrical section above it as a reservoir, so I guess I could cut a coffee filter into a circle to fit inside. I just happened to be browsing ebay and found a range of circular paper filters but wasn't sure which I should choose. Fast flow, medium flow, some specs in uM, blah blah blah. Given the fact I'll be doing a fair assortment of different things I should probably get a couple of different types. Cheap enough.

[Yummyrum]

Hi Blackened
Sorry if I'm telling you something you already know , but the idea is that they assist in speeding up filtering
Those Buchner funnels are meant to be used in conjunction with a side arm flask which is connected to a vacuum.

At the other place I work ,I recently discovered they use these to create a suitable vacuum to operate them .They are connected to a water faucet and the side arm creates the vacuum

Vaccuum Pump inline.jpg

Buchner Funnel.jpg

Filter flask.jpg

[SBB]

Some things can be a bastard to filter......progressively finer filters help a lot.......I wouldn't start off with anything to fine.

Just as a bit of a follow up
Ive found that metal kitchen strainers, cheese cloth and old bed sheets as well as worn out tee shirts can all be of use before using paper filters.
Some things like Apple Pie can be hard going to get perfect. Once you think you have achieved perfection stick it in the fridge for a month and see what still settles out. Thats when you get a very small siphon hose and suck the good stuff out of the container and leave the layer of crap behind.

[Yummyrum]

LOL ...forgot you need one of these too to stick the funnel in the flask ...but I'd use a natural cork one ;-)

Buchner Rubber adaptor.jpg

Once you think you have achieved perfection stick it in the fridge for a month and see what still settles out. Thats when you get a very small siphon hose and suck the good stuff out of the container and leave the layer of crap behind.

So true :handgestures-thumbupleft:

[Blackened]

Thanks yummyrum and SBB, :text-thankyoublue: I bought the buchner funnel to use for gravity feed some years ago, and no, at the time I didn't realise they were designed to work in a vacuum setup. :oops: I'm hoping with the correct type of paper I may still be able to use it as gravity feed, much the same as I use coffee filter papers now. At the very least it's great for first stage filtering or large solids (citrus peel etc) prior to using a coffee filter. Then again, maybe I'll lash out on a vacuum setup, though I doubt it lol.