Depending on the size of your boat you may need more than one. Boats less than 26' have to have at least one B-1 fire extinguisher on board. Boats 26'-40' need to have at least two B-1 fire extinguishers on board.
Graphite is an electric conductor, consequently, useful in such applications as arc lamp electrodes. It can conduct electricity due to the vast electron delocalization within the carbon layers (a phenomenon called aromaticity).
1 Diamond is the ultimate abrasive, Graphite is a very good lubricant. 2  Diamond is transparent, Graphite is opaque. 3  Diamond crystallizes in the Isometric system and graphite crystallizes in the hexagonal system. 4  Somewhat of a surprise is that at surface temperatures and pressures, Graphite is the stable form of carbon.