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).
When this carbon is graphitized in an electric furnace at 3,000Â°C, the amorphous carbon body takes on the structure of crystalline graphite. This is called graphite. Carbon materials are usually pitch impregnated and re-baked to enhance electrical and mechanical properties before graphitization.