1 powerboats 26 feet long but less than 40 feet long must carry at least two B-1 fire extinguishers or the equivalent, such as a B-2 fire extinguisher; 2  powerboats 40 feet long but less than 65 feet long must carry at least three B-1 fire extinguishers or the equivalent, such as one B-1 and one B-2 fire extinguisher.
Rather, the core is made up of a non-toxic mineral called graphite. The common name âpencil leadâ is due to an historic association with the stylus made of lead in ancient Roman times. If youâre looking for information on potential lead exposure risks in pencils, Click here.
Graphite is used inside pencils. It slips easily off the pencil onto the paper and leaves a black mark. Graphite is also a component of many lubricants, for example bicycle chain oil, because it is slippery. Like diamond, graphite has a giant molecular structure. As its covalent bonds are very strong, and there are many of them, a lot of energy would be needed to separate atoms. This makes graphite's melting point and boiling point very high.