F graphite pencils are made from graphite, the hard mineral found in the rock layers of the earth. It’s a material that forms in graphite-rich rocks, and it’s a valuable material for pencils. We don’t think it was made by hand. Because of the high cost and its scarcity, F graphite pencils are used only to make fine point writing pens and for pencil cases. This graphite pencil, like many types of F graphite, is made of two compounds: F-2 graphite and F-4 graphite.
What makes it special?
The F graphite is harder than normal graphite, and the combination of those two components forms special properties (high hardness and resistance to heat) about which pencil writers are well-known. Because of the high hardness, F graphite is also brittle. There is considerable pressure in the graphite when it is exposed to a force in excess of that usually found in steel. This will result in the brittle F-4 and a stiffer F-2. This is a property that makes the F graphite pencil very desirable. To illustrate this point graphite pencil writers use a special tool called a graphite cutter. It is used with an air compressor called an air compressor (called a compressor). The graphite needle is put in the air compressor and the air compressed. A very fine stream of graphite flows out of the needle, and out the air compressor and back into the pencil. There, it is cut into small, small pieces the size of microfiber beads. That produces a thin layer of graphite that is very difficult to scratch, so that the pencil writer can write on it with the force normally found in a steel ballpoint pen.
What are the F-4 and F-2 graphite pencils made of?
F-4 and F-2 graphite pencils are made of two different mineral compounds. The graphite compound known as F-4 (often called F-3) is a pure form of the mineral, with a high concentration of oxygen. Because of its high concentration of oxygen, F-4 graphite is an excellent tool for steel or glass. It forms a very high-density structure that makes writing on the graphite much easier. However, for writing in graphite that requires the use of steel, F-4’s hardness makes it too stiff and difficult to use. F-2 (sometimes called F-1) is a very