Your cart is empty.
Your cart is empty.This molded rubber filter disc is designed to support and seal in place a filter crucible or a funnel in the neck of a flask. Inside Diameter of the socket at the top is 32mm, and the outside diameter of the disc is 76mm. The bottom of the disc is flat to seal tightly against the lip of the flask. These are also useful for holding your round bottom flasks in place. These are sold by the each and brand new.
XisUnknown
2025-09-03 16:39:27
Works great with the "13cm Dia. (5.1") Filter Funnel, Buchner Style - 2 Parts, Polypropylene, Designed for 11-12.5cm Filter Paper". Didn't have to alter it at all. It does smell like rubber, but what do you expect? It is rubber!
Erickson
2025-08-09 16:22:32
the seal between this thing and the filter flask is hard to establish and maintain - the material is kind of hard, so perhaps it cannot conform enough to the top of the filter flask to make a good seal. With a strong and steady suction this may be less of an issue, but it did not work well for me. I'll probably try a drilled rubber stopper next.
Brady
2025-07-17 18:42:28
OK so this works pretty well but you have to flip it upside down from the way it is in the picture. It forms a perfect seal when you insert the funnel
Swage
2025-06-20 14:34:19
Thanks Amazon reviewers for some great tips. I have one of my own. Bear in mind both the funnel and flask opening diameters are important considerations. I'm using a 2 liter, heavy wall flask with a 13cm funnel which has a stem at least 1.25"ø. After my fail I decided the rubber disk was to stiff and not seated well along the stem. My solution was to place the disk in a 150°F water bath for 15 mins and gently press it onto the funnel stem with a section of PVC pipe. The disk seated fully against the funnel and flared beautifully. I achieved sufficient vacuum with a hand pump. I ran cold beeswax around the flask lip. See photo.
Customer
2025-06-02 19:23:57
good solid heavy glass - works well. No chips or scratches, not the cheap feather light glass stuff I often see
John
2025-04-19 15:08:18
Ver bad product! It looks solid and hard. It is leaking during filtration. You will regret to buy it with such price. Highly not recommended! I will not buy it again.
CaliLivin
2025-04-08 13:12:59
Not a Tight Seal.Get a Wilmad Filter Apparatus instead of one of these Buchner Funnels that don't work Properly at all.Wilmad Filter Apparatus with Medium Filter Papers.Best Advice! :)
M. R. Watkins
2025-01-19 11:59:24
Filter aid works, personally I'd like it better if it was a bit more flexible. It does work fine and as long as it does not harden with age should out last me.
Recommended Products
$31.99
$ 14 .99 $14.99