RogueRose
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Need gasket/sealant suggestion for circumfrence of 5 gallon bucket for "buchner funnel"
I have a re-inforced 5 gallon bucket that has an inner lip about 2/5-.5" wide and about 5" from the bottom of the bucket. The lip circles the
bucket. There is a 1/4" hose barb at the top of the inner ridge (would sit below the top bucket) and a drain at the bottom, on the opposite side of
the vacuum barb which can use anything from 1/4" to 5/8" hose barbs.
What I need is some kind of sealant for the ring on the inside of the bucket (seen as the edge of the orange inner bucket). I have tried silicone and
it made a real mess and I'm not sure exactly how to do it to make is flat and work correctly. I was wondering if there is some other kind of flexible
putty gaskets that can be re-moled over and over - kind of like a tar/rubber type thing (silly putty or that tacky stuff used for hanging stuff on the
walls without nails).
As a note, the bucket used to hold the filtrate is wider than the inner orange ring inside the bucket and the ring around the bucket is flat and level
the whole way around. So when the bucket is placed in the black receiver bucket, the bottom lip rests about 1/6-1/4" from the outer wall of the
bucket, basically in the middle of the ring.
Any suggestions are greatly welcome! Thanks!
**{edit} IDK what happened to the paragraph where I wrote about trying silicone around the edge. I lined the bottom edge and bottom side of the top
bucket with blue painters tape and pressed it down (1 gallon jug of water in bucket) on the bead around the ring. It was supposed to set in 30 mins
but after 4 hours I pulled the bucket out and 1/2 stuck to the bucket, the other half to the ring and it was still gooey in the middle (about 1/4"
bead).
That Permatex stuff looks like it might do well and the suggestion for the cling/Seran wrap sounds like a good idea.
Thanks much to those who responded!
  
[Edited on 14-7-2016 by RogueRose]
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Tsjerk
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Are you applying a vacuum during filtration? If so you could maybe try to find an O-ring instead of glue as the vacuum will keep things sealed.
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careysub
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You could try an ordinary gasket putty, put first roll it up in plastic wrap and use the wrapped putty roll as your reusable sealer.
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Bert
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Mood: " I think we are all going to die. I think that love is an illusion. We are flawed, my darling".
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Get a caulk tube of blue Permatex.
http://www.all-spec.com/Catalog/Adhesives-Sealants-Tapes/Ana...
Make yourself a gasket shaped ring on a sheet of Polyethylene plastic (so you can peel it off after curing and use it elsewhere), and let it cure in
the open for several hours, so it has skinned up but still has some liquid goo in the center. Place the gasket, and pull a slight vacuum to squeeze
all the parts together and smoosh them into your gasket, bringing it to final shape. Check for leaks... The skinned over sealant should not stick
permaently, with care, the gasket may be re-used. How I made man hole sized gaskets for obsolete steam boilers that ran as vapor systems a long time
ago.
Rapopart’s Rules for critical commentary:
1. Attempt to re-express your target’s position so clearly, vividly and fairly that your target says: “Thanks, I wish I’d thought of putting it
that way.”
2. List any points of agreement (especially if they are not matters of general or widespread agreement).
3. Mention anything you have learned from your target.
4. Only then are you permitted to say so much as a word of rebuttal or criticism.
Anatol Rapoport was a Russian-born American mathematical psychologist (1911-2007).
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yobbo II
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Obtain silicon sealent and apply lots where you need the seal. Then obtain some cling film (or some other very light plastic). Place the cling film
on the mess of silicon and gently place your top 'funnel' or what ever you have on top. Allow the whole lot to set. The cling film can now be removed
leaving (we hope) a percect fitting rugger ring.
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macckone
Dispenser of practical lab wisdom
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Depends on the solvent. Cork wrapped in teflon plumbers tape will withstand almost anything.
other choices are silicon as bert suggested and two part epoxy. The two part epoxy is inflexible but much more solvent resistant. Various types of
rubber sheeting are available for gasket material and price is the only object. You can even get viton for prices that aren't too horrible, but if
money is an issue cardboard wrapped in teflon tape is a really cheap.
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