numos
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Cleaning hotplates... Potential solution
When I bought my hot plate from Ebay, it, like most used hotplates had a dark brown black stain on it. I was unable to clean it with solvents, and
since it didn't affect the function I just left it.
Today while finishing up my phthalimide synthesis, some oil from the oil bath splashed on the plate and created another huge stain, this time forming
a thick enamel whose thickness I could feel.
Here is the stain:
I tried quite a few solvents, the result of water being here:
After that nothing was removed, I'm guessing the surface was rough and the towel just "sanded" down the stain, and once smooth no additional progress
is achieved.
Solution:
Piranha solution, place a few drops on the stain and let it sit for a minute, then dilute with water and wipe. (put on gloves for this step)
After the second round of piranha solution:
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Ozone
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I've found that spraying water on there while hot and wiping it off while boiling worked well.
O3
-Anyone who never made a mistake never tried anything new.
--Albert Einstein
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violet sin
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what about TSP or lye? I have always cleaned my pots and pans with either of those when nothing else worked. same with our utility sink, yard sale
finds, tools after working on my truck, ice chests, etc. etc. etc. I thought this a helpful suggestion, because it is especially useful for cleaning
a pan after frying up some tortilla's to make chips( oil + heat = polymerized crud ). you don't always get it first go, but it usually cleans up a
LOT of it right off the top. just not if it is aluminum of course. but enameled surfaces yep.
edit spelling
[Edited on 13-10-2014 by violet sin]
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Praxichys
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Be careful with NaOH/KOH. I severely pitted the enameled top of my old Scholar PC-170 with a molten bath of NaOH. I can see NaOH solutions potentially
concentrating on a hot surface.
Hydrogen peroxide applied while hot has worked well for me in the past, but these days I'll just let the plate run under the fume hood as hot as it
can go for a little while. The stains remain but anything with thickness burns/fumes off.
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WGTR
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I use Piranha all the time for this very thing! Heating the hotplate slightly with the solution get things even cleaner. Just use ventilation (of
course).
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Little_Ghost_again
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How do you stop a cast iron top from corroding? Could I use high temp paint like for woodburning stoves?
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violet sin
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Praxichys : I don't heat it. maybe use warm water, but room temp is fine too.
but ya, in my experience, you can etch enamel if you heat it or leave too strong a solution on for too long. but to exfoliate the oil crud only takes
a med strong solution at normal temps for 15-20 min. wipe rinse and repeat if need be. I use both often, but mainly TSP at work( not chem related ).
prep kitchen and bathroom walls for drywall re-texturing jobs. the oil from soot and cooking are a PITA if you get lazy. always worth scrubbing for
a few min, as opposed to having to do it again with free labor and material$ out of pocket.
to each their own, if others feel comfortable using piranha sol. that's fine. I'm good with something a bit more user friendly. my calloused hands
don't mind a cleaning too bad if my gloves rip on the jobsite or home.
little_ghost-again ( LGA ): found this for you, hope it helps.
" Folks, a great cast iron paint primer is Seymor's Cast Blast (available in spray cans). It has a high particulate application property and has
good rust prevention "
from this --> http://www.practicalmachinist.com/vb/general-archive/cast-ir...
and
http://astore.amazon.com/thewoodwhispe-20/detail/B0000DD1DV/...
suggestion from this thread here, http://www.thewoodwhisperer.com/articles/rust-prevention/
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