WeaponsRx
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Does anyone know if these are made cheaper?
I'm utilizing these adapters for buchner filtration apparatuses, so I can filter straight into a GL-45 threaded media bottle rather then a erlenmeyer
flask, but each one is $100 a piece.... enough said right? Anyone seen such adapters for less??
thanks guys! Happy new year.
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g1ng3rbr34d_m4n
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Quote: Originally posted by WeaponsRx  | I'm utilizing these adapters for buchner filtration apparatuses, so I can filter straight into a GL-45 threaded media bottle rather then a erlenmeyer
flask, but each one is $100 a piece.... enough said right? Anyone seen such adapters for less??
thanks guys! Happy new year. |
So what does it do? Screw onto a threaded bottle and attach to the funnel? Is that protrusion a vacuum adapter?
Seems to me one could rig up something similar from PTFE plumbing/toilet/water pipe adapter, maybe even stainless. A T-junction with threaded ends so
those screw on caps like the ones for garden hoses could be attached on the top and bottom, and some kind of a PTFE inlet screwed into the side...
You could even make it from steel and coat the inside with spray on PTFE...
Idk, just a couple thoughts off the top of my head.
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WeaponsRx
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yea its exactly as you interpreted, screws onto ay GL-45 media bottle, on top you slide in your buchner funnel, and the adapter has your side conical
for vacuum... materials I could essentially jerry rig this out of I would feel comfortable running my filtrate through to be honest... but great idea
if the filtrate was of a different nature for sure thank you.
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WeaponsRx
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hang on spray of PTFE huh? Not sure ive seen such a thing let me take a look. 
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Chemosynthesis
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If you know anyone with a 3D printer, that should be easily made for much less than retail.
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WeaponsRx
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how would that work?
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Zombie
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https://www.youtube.com/watch?v=8aghzpO_UZE
Down side is it would cost about the same as what you have.
I would have to believe a Buchner w/ built in vacuum will solve your problem. Seal it w/ teflon tape perhaps. These are around 20-30.00 USD.
[Edited on 18-1-2015 by Zombie]
They tried to have me "put to sleep" so I came back to return the favor.
Zom.
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Chemosynthesis
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Disassemble all the pieces (unscrew from threading), then scan with a 3D laser scanner. Verify the scans in a mesh modeling program or CAD, then print
in something like Taulman nylon with overhands utilizing a water soluble printing material. Leave in water. Reassemble parts.
I don't have a printer, but have seen it done. I have read that some office supply places like Staples of Office Depot offer printing services in 3D
printers now.
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DrMario
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Except most
commonly 3D printable materials are not very thermally or chemically stable. ABS, the most common 3D printable polymer, is easily attacked by most
organic solvents. Also, it has a glass transition temperature of only about 100 C.
Some printers can handle nylon, which is, IMHO, the best 3D printable material for chemical applications, but it has an even lower glass transition
temperature. Still, it doesn't get too soft at the GTT, so it kind of might work.
There are other 3D printing methods that would be actually very suitable for this application, but I am writing an article about this and I would like
to publish it without disclosing any details on random fora.
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Chemosynthesis
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Interesting. I am assuming you 3D print. Maybe you could start a thread on it at some point in the future as I have been very interested in it since
before it was accessible to all but automotive and aviation prototyping machines. I was under the impression most current 3D printers could handle
nylon as Taulman claims to have designed their nylon products with RepRap and Makerbot style machines in mind. I had thought I read that those two
machines dominated the market, but can't find anything definitive.
I haven't seen many people filter a hot solvent through an apparatus like that for what I presume to biological work (since the OP had asked about
autoclave sterilizing filter paper), but it is worth stating thermal risks. I hadn't even considered that. I have seen the Taulman 618 glass
transition temp listed at 49.4°C , and Taulman 645 at 68.2°C. Both had been advertised as "Chemically resistant to: Alcohols, Resins+MEK, Oils,
Acetone, Most all Alkaline, most 2 part Casting Compounds." Those should be plenty good for 99% of the biochemically/medically related filtrations I
have seen, but not necessarily synthesis. Zombie's suggestion of a fritted Buchner with vacuum attachment, sealed with a lathe-turned chemically
resistant bung should be fairly inexpensive and durable.
I noticed that Taulman 680 and the high temperature industrially-oriented 910 are not yet released, but expect them to have a glass transition
temperature above t-glase's 78°C.
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DrMario
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Let me reiterate something about nylon's GTT: it's generally fairly low (around 50C, as you could see yourself), but unlike ABS, it doesn't soften
very quickly. And as I already said, nylon is handled by most extruders in circulation today (not all, but the great majority) so all in all, it's a
viable option for a lot of chemical glassware fitting. I myself have 3D printed a lot of gas and liquid fittings from various 3D printable materials
which I won't disclose, but yes, I did use nylon as well.
Currently I work with other 3D printing techniques, such as additive manufacturing and stereolythography. The former allows for some very interesting
materials, the latter allows for high resolution, but material choice is super-limited.
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WeaponsRx
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Very interesting, if they are using Nylon then you'd think by now they'd have already have figured out how important it is and would be to get them
printing with PTFE or Teflon right? come on now..... But Yea the only filters I can run are PTFE and PVDF unless I want the membrane as a part of the
solution... Nylon is okay too, but yea that would indeed make my need for this adapter obsolete having the buchner with a side conical but I use a 2
piece Millipore buchner 47mm so i'd really just need to buy a new filter holder, one that has a conical but those on the other hand my friend are def.
more then the adapter I speak of.... then i'd still need another adapter to be able to filter into a media bottle which is what I seek.
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Etaoin Shrdlu
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| Quote: Originally posted by WeaponsRx | | Very interesting, if they are using Nylon then you'd think by now they'd have already have figured out how important it is and would be to get them
printing with PTFE or Teflon right? |
How do you propose to print with PTFE? It is not as easy as it sounds.
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WeaponsRx
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Yea well 2 years ago we said the same thing about 3d printers now didnt we.... I think its very easily possible if not already done... theres spray on
polytetrafluoroethylene.... whats the issue?
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Chemosynthesis
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http://forums.reprap.org/read.php?1,65051,88570
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Etaoin Shrdlu
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The link Chemosynthesis posted explains why nicely. I found the mention of PVDF interesting; isn't this fluorocarbon fishing line? It is at least easy
to acquire, though I don't know enough about 3D printing to guess whether processing into a usable form would be prohibitive (it's expensive, of
course).
[Edited on 1-23-2015 by Etaoin Shrdlu]
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