nux vomica
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Diy heating mantle, aka the coffee can heating mantle.
Hi everyone i was looking around for a heating mantle online when i saw these mantle liners for $ 14.58 us each. http://www.ebay.com/itm/232006964277
I messaged deschem and he said that they were 180 watt liners so they also have the element built in as well, so i bought a 250ml liner to see if they
were any good to make your own heating mantle up.
 
They definatly have a element built in so i needed a surround to support the liner and hold the wireing and insulation in.
This is where a coffee can comes into it as it holds the liner perfectly.
These are the can Dimensions.
 
I then cut the can up with a cutoff wheel, large piece is 90 mm high ,bottom 20mm high.
Ithen made a homemade tube shrinking tool out of a electrical crimping tool .
  
And shrunk the base to fit the can top.
Now i have a mantle body that is the right size .
 
It still needs a liner retaining ring and the power lead and insulation fitted but i will post that in the next few days .
Cheers nux
[Edited on 3-8-2016 by nux vomica]
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j_sum1
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Cool find and nice work. What will you use for insulation?
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nux vomica
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Thanks j_sum1 i have a heap of offcuts of the white hi temp fiberglass insulation at work luckly i did a huge bread crumb dryer job recently that had
a huge amount of lagging in it 
I found a tin with the same dimensions on the diameter so i cut the lid part off and slit it verticaly it will make a nice retaining ring if held on
with a hose clamp.
[Edited on 3-8-2016 by nux vomica]
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CharlieA
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Nice job!
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careysub
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Vermiculite and perlite would be excellent insulation.
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nux vomica
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Thanks charlieA
I managed to find a hose clamp to fit the retaining ring and i made a side extention for the wireing grommet to go through, out of the bottom of a
small spray can, now i can give it a paint then wire it up.
 
[Edited on 4-8-2016 by nux vomica]
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nux vomica
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It,s finished now i didnt bother to paint it natural finish looks ok.
I used fiberglass heatproof wire to connect between the element and the 240v lead , then i coverd it with fiberglass braid.
Insulation finished.
All done.
I am useing a triac voltage controller to vary the power , its a seperate plug in unit .
Cheers nux.
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j_sum1
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Wonderful!
I would follow suit but I don't think I have a need for a mantle that size. I have a 500mL and use one of these for anything small.
I did not know that these mantle liners were available. I might purchase a 1L liner and make up a heating pad similar to what NileRed uses.
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nux vomica
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Quote: Originally posted by j_sum1  | Wonderful!
I would follow suit but I don't think I have a need for a mantle that size. I have a 500mL and use one of these for anything small.
I did not know that these mantle liners were available. I might purchase a 1L liner and make up a heating pad similar to what NileRed uses.
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Im the other way around, all small flasks and only one 500ml.
I wouldnt mind one of those heating pads we have welding blankets at work that are extra thick material like the pads seem to be, the fiberglass cloth
i have seen seems to be to thin to be of any use.
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nux vomica
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Finally had a chance to use the mantle today fractionating acetaldehyde from ethanol wish i had one a long time ago now i see how much better they
heat compared to a hotplate , well worth the time and money i think.
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careysub
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Do you know the operating voltage for these things for their peak power output?
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nux vomica
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The seller said they are 240 volt 180 watts output for the 250 ml mantel liners im sure if you ask they would be able to supply 110 volt units.
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arkoma
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Wow, this was really good work Nux.
Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts.
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nux vomica
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Thanks arkoma a 500ml one is going to be in my shopping list soon i think.
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careysub
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This stimulates an idea for combining magnetic stirring with heating mantles.
Build a "stir table" using powerful rare earth magnets, and then have a range of heating mantles in different sizes built so that there is no magnetic
shielding, and a minimal insulation thickness on the bottom.
Ordinary type N neodymium magnets have a maximum operating temperature of 140 C if they are as thick as they are wide (thick magnets are the strongest
magnets anyway), even though have a normal max operating temp of only 80 C. If higher temperature tolerance is needed (and I am thinking not) then SH
types, still reasonably priced, have a normal max operating temp of 150 C, and probably much higher in thick magnets.
But with suitable design of mantles and table the magnets should not get very hot I think. It seems unusual for flask temperatures to exceed 250 C
(and usually much lower with most solvents), but the temperature to which the magnets would be heated would be far lower.
The magnets would be spinning in free air, with a cooling fan supplying cool air. Above the magnets (but very close) would be a white or reflective
surface to suppress thermal emission, which would be white or reflective on the topside also to suppress absorption. The mantle itself would have a
thin insulator on the bottom, a sheet of ceramic paper perhaps, or if you can limit the temperature to 200 C, then 1/4" of polyisocyanurate which is
an excellent insulator. Having a narrow air gap underneath the mantle system would prevent direct conduction and allow cooling air to be blown under
if needed (holes in the spin table). In such a design I doubt the magnets would actually get very hot.
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aga
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Beautiful creation nux vomica !
Ebay here i come ...
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HeYBrO
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@ j_sum, what it that little thing that you use?it looks like a micro oil bath
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j_sum1
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http://www.ebay.com.au/itm/AU-Plug-Lead-Free-Soldering-Solde...
Except mine is 80mm.
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