Choosing filter paper

[Rreyes097]

What is everyone go with for filter paper what are the numbers and specs mean and what sizes do people normally use I'm just trying to get a feel for it before I buy those round ones I've been using coffee filters but I'm trying to get the other kind now.

 

[Probrefiner]

Hi

I used to use Whatman quantitative 540 - 542 filter papers for most precipitates in acid and base solutions very consistent with good retention, I think it depends on what your looking to filter?

Regards

Rob

 

[Martijn]

I use these.

I rarely use the flat round ones.

Editet for spelling.

 

[goldscraphobby]

I have been using coffee/tea filters for filtering first then going to whatman round ones for the fine filtering with a Buckner funnel. I had been having issue with stuff getting under them so I recently tried the "charmin plug" using using a funnel & fiberglass. I took a wide mouth funnel and stuffed fiberglass into it.

This thing was fantastic, very fast filtering and very clean solution. I'm not going back to the other way.
A lot cheaper to run.
I also now do a pre-filter to skip the coffee filter. I stuff the funnel with a large piece of fiberglass and then put another small piece of fiberglass at the top (the pre-filter).

I just remove the "pre-filter" to get rid of the large crap and for the next filtering I add another pre-filter.