PSN-L Email List Message

Subject: Re: Diamagnetic Graphite
From: ChrisAtUpw@.......
Date: Tue, 11 Jun 2002 11:55:05 EDT


Hi All,

       In response to James Spottiswoode's graphite seis rig at 
http://www.jsasoc.com/diamagnetic_suspension_seismomet.htm I took a magnet 
setup into my local arts materials / stationery suppliers and went through 
their stock of pencil leads. I can confirm that Faber Castell O.7 mm x 60 mm 
2B leads are strongly diamagnetic. 12 off cost $1. None of the larger ~1/16" 
leads that I tried were diamagnetic.

       Cyanoacrylate glues seem to stick graphite more or less OK. Epoxy will 
stick Graphite very well, but it doesn't like water at all. Cold Graphite is 
covered with several layers of water and you have to drive this off first, by 
heating it to more than 150 C before you can glue it with Epoxy. Possible 
heating sources are hotplates on electric stoves and soldering irons. Epoxy 
is mildly diamagnetic. 

       Regards,

       Chris Chapman
Hi All,


      In response to James Spottiswoode's graphite seis rig at http://www.jsasoc.com/diamagn etic_suspension_seismomet.htm I took a magnet setup into my local arts materials / stationery suppliers and went through their stock of pencil leads. I can confirm that Faber Castell O.7 mm x 60 mm 2B leads are strongly diamagnetic. 12 off cost $1. None of the larger ~1/16" leads that I tried were diamagnetic.

      Cyanoacrylate glues seem to stick graphite more or less OK. Epoxy will stick Graphite very well, but it doesn't like water at all. Cold Graphite is covered with several layers of water and you have to drive this o ff first, by heating it to more than 150 C before you can glue it with Epoxy. Possible heating sources are hotplates on electri c stoves and soldering irons. Epoxy is mildly diamagnetic.

      Regards,

      Chris Chapman

[ Top ] [ Back ] [ Home Page ]