Buchner Funnel, 11cm - Polypropylene, 2 Parts - Designed for 11-12.5cm Filter Paper - Stem Length, 8.5cm - Lightweight, Autoclavable - Eisco Labs
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It's more along the lines of "frequently returned together" than anything else. br>I'm going to try drilling a funnel-sized hole in the stopper, but that's the only solution I can think of. I don't see a way to mark the recommendation as spam, but I'm hoping that people will read the comments anyway. br>This funnel's spout is about 2cm wide, while the hole in the stopper is closer to half a centimeter. br>The stopper fits the flask (barely), but not the buchner funnel that comes with it.
Hello Ray,br>If you're trying to recover microfine product, you'll need this, as well as a vacuum pump and some very fine Whatman filters. However, you must ensure that the edges of the filters do not lift up during the vacuum process, or your product will fall beneath the filter, potentially resulting in its disposal. It isn't necessarily for refining, but rather for collection after processing and prior to refining. It comes in handy when figuring out recovery weights. In order to get an accurate weight of the filter paper, you must run a parallel filter through the rinse and vacuum process. After all of that rinsing and vacuuming, they lose weight, so when calculating recovery amounts, the starting weight will not be the correct weight of the filter paper. I prefer the plastic models to the ceramic models because the ceramic can catch your product, which can stick to glass, especially if the particles are small. I use Whatman 387 filters, which are capable of retaining material down to about 1 micron. If you don't have a vacuum pump, they're expensive and slow, but they work well. So, in response to your question, yes, you do require something similar to this, but not for refining. It's required for healing to take place. It also depends on the type of lixivant you're using to make your product. Some lixivants are harsher than others, causing damage to your pump. It is dependent on your method.
I didn't take any measurements of the flatness of the surface. The Buchner Funnel worked well with paper filters in my application.
Selected User Reviews For Buchner Funnel, 11cm - Polypropylene, 2 Parts - Designed for 11-12.5cm Filter Paper - Stem Length, 8.5cm - Lightweight, Autoclavable - Eisco Labs
The size of the plastic filter funnel is odd, but it works well. br>I use 110 mm filter disks, which require a weight to keep them in place because the clear open area is approximately 120 mm in diameter. The space is insufficient for 125 mm disks to lay flat, but it can be used with the weight to keep them in place. br>I created a two-piece weight consisting of a 1/8" thick 115 mm aluminum flat ring that sits on the filter disk and a 110 mm x 10 mm stainless rigging ring (heavy) that sits on top of the alum ring. The weights keep the filter disk in place so it doesn't lift and float around when the liquid is poured in. br>I also built a pressurizer rig to speed up the flow of liquid through the filter. It's a 1/8-inch aluminum round disk that's larger than the funnel's rim and has a foam-like surface. A 1/4" copper air hose nipple is stuck in the center, with a blood pressure squeeze bulb to pump it up, and a silicone rubber gasket is attached to one side. br>Hold the lid on by hand (in a 1000 ml Erlenmeyer flask with the funnel) and process the liquid in record time. br> TMI. With a 30 micron filter, I use the funnel to filter large batches of brewed tea. One filter disk can handle 500 ml of water at 16 bags per liter of water before clogging. A gallon of tea is made from 16 tea bags.
The funnel is too small to work with 125mm paper. Furthermore, the two pieces do not seal properly, resulting in a vacuum loss of about 10 inHg. Seriously, you have no business making or selling scientific equipment if you can't perform a simple linear measurement. DIAF.
Great for what I need, and the two-part funnel is simple to clean. Holds the filter in place well, and the drain holes allow for both vacuum and gravity filtering. The only disadvantage of this size is that the neck is almost as big as my flask, so I had to make do with some amalgamated tape to get a good vacuum seal. Aside from that, it's light weight and easy to clean; you won't have to worry about it tipping over your flask unless it's completely filled. If that's the case, it's a good idea to mount it on a stand or another solid object.
Tolerance is not a good thing. Actually, it's obvious that this is made for 125mm paper with a 130mm outer diameter and a thickness of 5mm. Something went wrong with post-fabrication plastic shrinkage, and it couldn't be rated for 125mm, so these guys are marketing it as 110mm paper compatible. This is a completely ineffective method of operation. The overlap on 110mm paper is far too small, and the overlap on 125mm is far too large. As a result, this is a shoddy product, and you should avoid purchasing it. Porcelain is the way to go. You will get better results, despite the fact that it will be much more expensive. This is a poor product. In addition, there is a yellow residue all over the place - It's unclear exactly what it is. The inner surface, on the other hand, is completely scratched.
It's made of cheap materials and comes in two pieces that don't fit together properly. When using a vacuum or suction of any kind, this device is completely useless.
For an experiment, I needed a bigger Buchner funnel. I didn't want to spend $100 on something I'd only use once, but it works fine and I'm going to keep using it for now. At this price, it's impossible to go wrong.
This funnel holds up well for the price and can create a solid vacuum. It's worth noting that the funnel and filter components can be separated for easy cleaning. I use (SEOH Filter Paper Qualitative Fast 11cm) for basic filtering and found it to be a good value. If you want a tight fit for a more thorough vacuum to form, you'll probably want to invest in a (SEOH Rubber Filter Aid For Filtration Flask).
With 11 cm filter paper, this works fairly well. To attach it to a filter flask, I bought adapter cones. It easily separates for cleaning, though the interior remains relatively clean as long as the filtering is done properly. It doesn't seal as tightly as a porcelain funnel or hold as much vacuum, but it's closer than I expected, makes a good seal, and is much less expensive for the size. It seems to be holding up well after a few uses, and the funnel cleans up well even with coffee residue. The funnel's total capacity is around 700-800 gallons. Because the volume is 800 mL, a 1 L filter flask will suffice.
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