Bel-Art Scienceware F42020 Polypropylene Bottom Space Saver Vacuum Desiccator, 19.7cm ID, 23cm Flange OD, 26cm Height, 19cm Plate Size
|Price:||$80.10 ($80.10 / Each) & FREE Shipping. Details|
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- Holds a full vacuum (29.9" Hg 75.9cm) at room temperature for 24 hours; will remain airtight even if not under vacuum
- Polypropylene stopcock with PTFE plug accepts 6.4mm (1/4") I.D. tubing and allows a controlled entrance of air preventing unnecessary turbulence
- 'Flat Dome,' clear polycarbonate top with large ribbed knob maximizes interior clearances and provides an average of 13% greater interior volume over standard hemispherical domes
- All models include a 0.32 cm (") thick perforated plate; disposable or reusable desiccant can be placed on or under this plate
- Clear polycarbonate top on a bottom that is either clear polycarbonate or chemical-resistant white polypropylene
|Number of Items||1|
|Size||Polypropylene, 19.7 cm ID, 23 cm Flange OD|
Specification for this product family
|Brand Name||Bel-Art Products|
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From the Manufacturer
Desiccators are an economical and reliable way to assure dry, dust-free, and if necessary, air-free storage of humidity sensitive products, such as valuable reagents or electronics.
Depending upon what you are storing, optimal conditions can be achieved using standard desiccants in a manual or automated format, with gas purge or by keeping the contents under vacuum.
When choosing a desiccator the following questions should be considered:
Q. What storage environment is optimal or required?
A. Use this chart for an overview of the environment and benefits each method of desiccation provides.
|Standard Desiccant||Automated, Standard Desiccant||Gas Purge||Vacuum|
|Manual monitoring and operation. Moisture is absorbed from air in the unit by using a desiccant. Once the desiccant is 'saturated' it must be regenerated through heating, or replaced.||Electric fans and heaters continuously regenerate the desiccant to prevent saturation and to automatically maintain a low humidity environment.||A slow steady flow of inert gas (often dry nitrogen) is provided.||Air and moisture are removed by the chamber by use of a vacuum pump.|
|Flexibility to use any type of desiccant (silica gel beads, activated charcoal, etc) based on economics and convenience.||Convenience, requires minimal monitoring.||Achieve relative humidity at a much faster rate.||Best for total dry storage or if air could be damaging to material being stored.|
|Portability.||Precise control of humidity. Operates on a set schedule of desiccation followed by a regeneration period.||Dust free and desirable for many applications including clean room environments.||Dust free and desirable for many applications including clean room environments.|
|Economical functionality. Most desiccants can be regenerated periodically.||Process uses silica gel beads that last for thousands of regeneration cycles.||Option to close stopcocks and use with regular desiccants.||Option to close stopcocks and use with regular desiccants.|
What do you need to know to choose the right desiccator?
Q. What size(s) are the items you need to store and in what quantity?
A. Interior volume of the desiccator and shelving should be considered.
Q. How important are ease and economy of use?
A. Each method of desiccation has advantages and trade-offs. Each user must determine the method that best serves their purposes. Using standard desiccants and regenerating them as needed is economical, but requires monitoring. There may also be more variability in your environment. An automated desiccator requires much less monitoring but uses electric power. Gas ported desiccators are quick to achieve relative humidity, but if the unit is accessed frequently, proportionately more gas will be needed to keep the desired low humidity level. Vacuum desiccators remove air and moisture and can be brought back to vacuum rather easily after opening but require a pump.
Once you have determined your most desirable method of desiccation, there are a variety of styles and sizes of desiccators to choose from.
Search by brand name indicated below for more information.
|Secador||Space Saver||Techni-Dome||Dry-Keeper||Lab Companion||Scienceware|
|Standard Desiccation||0.31 to 1.87ft³||0.09 to 0.31ft³||0.14, 0.35, 2.01 & 2.08ft³||0.21 & 3.6ft³|
|Automated, Standard Desiccation||0.51 to 1.87ft³||1.2, 2.01 & 2.08ft³||3.6ft³|
|Gas Purge Desiccation||0.31 to 1.87ft³||2.29ft³||0.14ft³||3.6ft³|
|Vacuum Desiccation||0.09 to 0.31ft³||2.29ft³||0.2, 0.4, 0.7, 0.8, 1.2 & 1.6ft³||0.015 & 0.21ft³|
|Bottom Material||White Polypropylene||All-Clear Polycarbonate||White Polypropylene||All-Clear Polycarbonate||White Polypropylene||All-Clear Polycarbonate|
|Flange O.D.||17.1cm (6¾")||17.1cm (6¾")||23cm (9¹/₁₆")||23cm (9¹/₁₆")||27.3cm (10¾")||27.3cm (10¾")|
|I.D||14.9cm (5⅞")||14.9cm (5⅞")||19.7cm (7¾")||19.7cm (7¾")||24cm (9⁷/₁₆")||24cm (9⁷/₁₆")|
|Plate Diameter||14cm No.3||14cm No.3||19cm No.4||19cm No.4||23cm No.5||23cm No.5|
|Overall Height||20.6cm (8⅛")||20.6cm (8⅛")||26cm (10¼")||26cm (10¼")||31.1cm (12⅛")||31.1cm (12⅛")|
|Clearance above plate||12.1cm (4¾")||12.1cm (4¾")||15.7cm (6³/₁₆")||15.7cm (6³/₁₆")||19.7cm (7¾")||19.7cm (7¾")|
Size: Polypropylene, 19.7 cm ID, 23 cm Flange OD
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Top Customer Reviews
The desiccator shells themselves are quite thick and seem durable.
The neoprene gasket is too small for the groove it sits in and it easily pops-out. You must be very careful to get the gasket to sit and then carefully place the top on. The timing is not ideal when your hands are contaminated with RTV or resin and the neoprene gasket slips out. I plan to try grease to see if it will stay better, or ultimately use some Piobond or similar glue
The valve that comes with it is not high quality and leaks. I had to run my vacuum pump continuously to maintain the vacuum.
Despite the quirks, these do work and are considerably cheaper than a bell jar.
This item is not as advertised. It is not Bel-Art part number 420120000.
The stopcock valve has been removed that is a standard element of the proper assembly.
I am sure the seller will point to the fact that a picture of the modified assembly has been taken and included that does not show the valve; and, that is correct.
But, if you purchased this item by part number anywhere else, you would receive the complete, unaltered assembly.
Even the literature enclosed indicates the valve.
Otherwise, it functions as required.
Only, I was cheated out of a $5 valve. (presumably sold by the seller to someone else for additioanl profit)
Such are the risks of purchasing from other than the proper source. All to try to save a few bucks!
As other reviews note, it's pretty sturdy, but the o-ring likes to jump out of its groove and the petcock has a tendency to loosen and leak a little. It generally won't hold a useful vacuum without the pump running, and certainly not for 24 hours. It does allow me to completely de-air 275 grams of Smooth-On Mold Max XLS II in 5 minutes or so when using a 5CFM pump.
Would I buy again? Probably not... I think I'd just do DIY vac chamber with a section of 8" PVC, some polycarbonate sheet, and silicone caulking.
After a couple years of light use (purchased in Feb 2012) I gave up on this product.
Firstly, it could never hold a vacuum because the parts were not airtight. The valve is based on a piece of rigid plastic tubing which is simply pushed onto a small nozzle on the lid of the device. By itself this was never airtight. I obtained a better seal by sealing it around the nozzle with silicone, but the desiccator still began to lose pressure the moment the vacuum was turned off. I am guessing this is because all of the nozzle parts are plastic, so closing the valve completely airtight is simply impossible.
The too-small o-ring was always too small, so I had to stretch it every single time I used the product, and then each time I took the lid off, it popped off. It's minor, but that wastes valuable time. One of the times that I stretched it, it snapped. I poured silicone into the void on the jar but couldn't recreate the seal. I ended up using the original gasket and filling the hole with silicone putty (mack's ear plugs, in fact) and was able to still use the desiccator, but the putty was messy and had to be reapplied with each use. Repeated attempts to find a replacement o-ring were a failure. The Bel-Art site did not list the o-ring under replacement parts. To be fair - I never called. But that's because I had already realized that I could do better, and by then I was ready to buy a new vacuum chamber.
In January of 2015, a year ago, I purchased a replacement vacuum chamber 2 Gallon Vacuum Chamber to Degass Urethanes, Silicones and Epoxies. This is a 5-star vacuum chamber.Read more ›
Most Recent Customer Reviews
I have no idea what you need this for. Chances are you don't want it for the kitchen, but since I'm using it in the kitchen that is what I will talk about. Read morePublished 7 months ago by Seth A. Ratner
I have had excellent results. Without an active vacuum it has kept Ammonium Nitrate and several other chemical powders extremely dry. Read morePublished 15 months ago by B. Hodulik
But for my personal use it would be large enough. I will be using it to remove the solvent/residual water from my botanical extractions. Read morePublished 17 months ago by Hoodycrow