How to characterise Different pencil graphite elctrodes (5H,4H,3H,2H,H, HB, B,2B,3B,4B,5B ) .

I want to test pencils of different grades (i.e different carbon content H,2H,3H,4H,5H...B,2B,3B,4B,5B...AND HB) as electrodes. The OCP which I got is not following trend. Can anybody help in this...

30 July 2016 7,434 2 View