Is pencil lead magnetic?
Is pencil lead magnetic?
(OP)
Yes, I know. It isn't. Or, rather, diamagnetic - a magnet repells graphite.
But: http://gke.org/pub/files/Grafit%20magnetisk.JPG
Here a piece of drawing pencil lead is attracted by a Neodym magnet. I cannot understand this, it is beyond grasp of an EE.
Any good answers?
But: http://gke.org/pub/files/Grafit%20magnetisk.JPG
Here a piece of drawing pencil lead is attracted by a Neodym magnet. I cannot understand this, it is beyond grasp of an EE.
Any good answers?
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.





RE: Is pencil lead magnetic?
Maybe some static in the polymer. Seems very unlikely though. I would think that much graphite would be a pretty good antistatic.
Regards
Pat
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RE: Is pencil lead magnetic?
RE: Is pencil lead magnetic?
I appreciate your humor, MJ - but not sure they do. Order, please! At least for a few hours...
I know - this will make it worse. But I tied. Didn't I?
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Is pencil lead magnetic?
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Is pencil lead magnetic?
http://www.physicsforums.com/
RE: Is pencil lead magnetic?
RE: Is pencil lead magnetic?
RE: Is pencil lead magnetic?
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Is pencil lead magnetic?
OK. I will be looking for pure graphite. Hmm.. where did I put that Merck sample..
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Is pencil lead magnetic?
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Is pencil lead magnetic?
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
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for site rules
RE: Is pencil lead magnetic?
Swall's comment is a good one. Not sure about iron oxide contaminating graphite - but I was thinking about the pyrolysis stage of graphite production, which is generally a reducing, not oxidizing, environment. I suppose if the graphite is later hot- or cold-pressed, it might pick up some iron by abrading tool surfaces.
Time for more coffee.
RE: Is pencil lead magnetic?
Yes, I reread and understand now.
I have a test tube. And HCl and H2SO4 and then some gear (a visitor discovered that in our scrap house this sommer). Can I test for iron with that? If I ask Missus for baking powder and such things? Vinegar, perhaps?
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Is pencil lead magnetic?
RE: Is pencil lead magnetic?
ht
RE: Is pencil lead magnetic?
TTFN
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RE: Is pencil lead magnetic?
That is what I had hoped for, also. But my thin leads all jump to the magnet. I have searched the attic and I have found a box with carbon "things". Wife told me that her grandfather was active in the graphite business and made electrodes for the steel industry. He also sold something he called "Cylinder Dew" that was used for steam engines. So, there is a welth of graphite to test. I even found something that I thought was nitroclycerin, but it is an oil/graphite emulsion. I will try that also in a magnetic field. A truly dark night and some black magic awaits my innocent and white soul.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Is pencil lead magnetic?
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Is pencil lead magnetic?
RE: Is pencil lead magnetic?
Cpro, the paper is interesting, but the result (which they say correlates to increasing defects in graphite crystalline behavior) could also be explained by rising iron content in the lead samples.
RE: Is pencil lead magnetic?
The wood blocks contain bottles with an oily liquid. There are textile shock absorbers and we naturally thought it was Nitroglycerine - Alfred Nobel's Manor and Laboratory is just five or six miles from us - but it is a harmless emulsion of collodial graphite in oil, the so called Cylinder Dew. The little tin bottle also contains Cylinder Dew - the friction proofing of those days. The other items are graphite in different shapes. From rods via little 'pearls' to granulate. There are also disks and other shapes.
An interesting find.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Is pencil lead magnetic?
RE: Is pencil lead magnetic?
The blog lady asked me to say that Mint Julep made her ROTFL. And, that lady isn't easily impressed. She is - among other things, also a basket-ball coach.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Is pencil lead magnetic?
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Chinese prisoner wins Nobel Peace Prize
RE: Is pencil lead magnetic?
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Is pencil lead magnetic?
Nice try, Gunnar.
RE: Is pencil lead magnetic?
But here: http:
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Is pencil lead magnetic?
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Chinese prisoner wins Nobel Peace Prize
RE: Is pencil lead magnetic?
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Is pencil lead magnetic?
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Is pencil lead magnetic?
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Chinese prisoner wins Nobel Peace Prize