[Dan]

I have some 2.1 cm Whatman glass microfibre filter discs (these ones), which I use very regularly and are an ideal size. However, I recently broke our one and only porcelain Hirsch funnel that fits these pads, and I can't seem to find a replacement.

I have contacted the supplier of the filter paper, to ask them if they sell a funnel that goes with it, but no luck so far.

I am not clear as to what the various measurements given by suppliers refer to: plate diameter, top diameter, nominal diameter. It's very frustrating, so I was hoping someone could point me in the direction of a supplier.

[Honclbrif]

Something like this?

http://www.sigmaaldrich.com/catalog/product/aldrich/z276537?lang=en&region=US

I think you need to search for either "disc diameter" or "perforated area diameter".

[Dan]

No, those are not designed for use with filter paper, they
have a built in glass filter. I'm after something where the
perforated area is not the entire plate surface, so like the
old style porcelain Hirsch or Buchner funnels.