Abromination
Hazard to Others
Posts: 432
Registered: 10-7-2018
Location: Alaska
Member Is Offline
Mood: 1,4 tar
|
|
Metal Pot on Ceramic Hotplate
Well, my internet crashed and I lost my damn post so Ill keep this short.
My hotplate stirrer says not to use metal pots on its ceramic top when using an oil/water bath. Is this something to be considered an actual hazard? I
can get the idea behind it but I dont know if it will actually ruin the hotplate. Ive seen many others do it with similar corning hotplates, but I’m
not sure.
Thanks.
List of materials made by ScienceMadness.org users:
https://docs.google.com/spreadsheets/d/1nmJ8uq-h4IkXPxD5svnT...
--------------------------------
Elements Collected: H, Li, B, C, N, O, Mg, Al, Si, P, S, Fe, Ni, Cu, Zn, Ag, I, Au, Pb, Bi, Am
Last Acquired: B
Next: Na
-------------- |
|
|
Sulaiman
International Hazard
Posts: 3721
Registered: 8-2-2015
Location: 3rd rock from the sun
Member Is Offline
|
|
gussing;
maybe it is to avoid people putting ferromagnetic pots that would prevent magnetic stirring ?
any metal pot, even Al, Cu etc. will cause an extra load on the stirrer motor due to eddy currents/ Lenz's law.
CAUTION : Hobby Chemist, not Professional or even Amateur
|
|
|
Abromination
Hazard to Others
Posts: 432
Registered: 10-7-2018
Location: Alaska
Member Is Offline
Mood: 1,4 tar
|
|
I think the manual said something about overheating of the ceramic top. Ill find it in the morning, I’m too damn tired tonight. Luckily, if the
motor malfunctions, it will actually automatically shut itself off to prevent damage of the stirring function. It also warns against coating the
ceramic top in aluminium foil. I suppose they are concerned about the top cracking under heat stress.
List of materials made by ScienceMadness.org users:
https://docs.google.com/spreadsheets/d/1nmJ8uq-h4IkXPxD5svnT...
--------------------------------
Elements Collected: H, Li, B, C, N, O, Mg, Al, Si, P, S, Fe, Ni, Cu, Zn, Ag, I, Au, Pb, Bi, Am
Last Acquired: B
Next: Na
-------------- |
|
|
Ubya
International Hazard
Posts: 1247
Registered: 23-11-2017
Location: Rome-Italy
Member Is Offline
Mood: I'm a maddo scientisto!!!
|
|
metal should conduct heat faster from the plate, i can't understand the connection with a overheating problem
---------------------------------------------------------------------
feel free to correct my grammar, or any mistakes i make
---------------------------------------------------------------------
|
|
|
draculic acid69
International Hazard
Posts: 1371
Registered: 2-8-2018
Member Is Offline
|
|
Is the actual plate made of ceramic or is it just an aluminium plate with some sort of ceramic coating sprayed on it?
|
|
|
Abromination
Hazard to Others
Posts: 432
Registered: 10-7-2018
Location: Alaska
Member Is Offline
Mood: 1,4 tar
|
|
It is aluminum coated ceramic, similar to most other ceramic topped hotplates including all of the corning brand hotplates I have used. I should also
add that I have seen the same warning on corning hotplates about cracking of the ceramic top while using metal pots for baths.
List of materials made by ScienceMadness.org users:
https://docs.google.com/spreadsheets/d/1nmJ8uq-h4IkXPxD5svnT...
--------------------------------
Elements Collected: H, Li, B, C, N, O, Mg, Al, Si, P, S, Fe, Ni, Cu, Zn, Ag, I, Au, Pb, Bi, Am
Last Acquired: B
Next: Na
-------------- |
|
|
WGTR
National Hazard
Posts: 971
Registered: 29-9-2013
Location: Online
Member Is Offline
Mood: Outline
|
|
It’s because the metal container will not be flat enough to make full contact with the hot plate over its entire surface. The parts that contact
the hot plate directly can wick heat away from the ceramic surface quickly, causing heat stress across the ceramic surface, and possible cracking.
|
|
|
wg48temp9
National Hazard
Posts: 786
Registered: 30-12-2018
Location: not so United Kingdom
Member Is Offline
|
|
Quote: Originally posted by WGTR  | | It’s because the metal container will not be flat enough to make full contact with the hot plate over its entire surface. The parts that contact
the hot plate directly can wick heat away from the ceramic surface quickly, causing heat stress across the ceramic surface, and possible cracking.
|
That does not make sense to me as all my SS pots are much flatter than my glass beakers and glass FB flasks.
Perhaps its reflectivity of the SS is the problem.
I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
|
|
|
draculic acid69
International Hazard
Posts: 1371
Registered: 2-8-2018
Member Is Offline
|
|
| Quote: Originally posted by Abromination |
It is aluminum coated ceramic, similar to most other ceramic topped hotplates including all of the corning brand hotplates I have used. I should also
add that I have seen the same warning on corning hotplates about cracking of the ceramic top while using metal pots for baths. |
You mean aluminium coated WITH ceramic right?
Not just that but how would a aluminium plate crack? Has anyone ever had one crack?
|
|
|
Abromination
Hazard to Others
Posts: 432
Registered: 10-7-2018
Location: Alaska
Member Is Offline
Mood: 1,4 tar
|
|
| Quote: Originally posted by draculic acid69 | | Quote: Originally posted by Abromination |
It is aluminum coated ceramic, similar to most other ceramic topped hotplates including all of the corning brand hotplates I have used. I should also
add that I have seen the same warning on corning hotplates about cracking of the ceramic top while using metal pots for baths. |
You mean aluminium coated WITH ceramic right?
Not just that but how would a aluminium plate crack? Has anyone ever had one crack? |
I meant aluminum coated with ceramic. I also found that it is not aluminum but stainless steel. And it would be the ceramic that would crack, not the
thin metal sheet underneath. I found the manual and cracking in the manner WGBT described is what they were concerned about. My question of whether or
not metal should be totally avoided has still not been answered. Like I said, I have seen many people use metal pots on similar hotplates with similar
warnings from brands such as Corning yet I have never heard of this causing damage to the hotplate surface.
List of materials made by ScienceMadness.org users:
https://docs.google.com/spreadsheets/d/1nmJ8uq-h4IkXPxD5svnT...
--------------------------------
Elements Collected: H, Li, B, C, N, O, Mg, Al, Si, P, S, Fe, Ni, Cu, Zn, Ag, I, Au, Pb, Bi, Am
Last Acquired: B
Next: Na
-------------- |
|
|
Pumukli
National Hazard
Posts: 708
Registered: 2-3-2014
Location: EU
Member Is Offline
Mood: No Mood
|
|
WGTR's explanation does make sens I think!
Irregularities in glass beakers and other glassware is not a problem, because glass is a bad thermal conductor (compared to metals) and can't syphon
the heat away from spots on the ceramic to such an extent as the bottom of a metal pot could.
Especially if that pot was just removed from the fridge and contains a big chunk of ice...
Or a cold oil/water bath to start to heat it up.
|
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
