What is the difference between the conductive effects of different grades of graphite? Refers to the pencil core
B is "black" (black) English prefixes, on behalf of graphite, is used to represent the case of soft pencil and write the obvious level. To "6B" for the most soft, the most black handwriting, often used in painting, ordinary pencil mark is generally "Hb."". The pencil mark used to cover the answer sheet during the exam is usually "2B""
Such as "H" or "hard" English (hard) on behalf of the prefix, clay, pencil hardness to said. The bigger the number in front of the H (such as 6h), the harder the pencil core, the greater the proportion of clay in the cartridge to the graphite, the less pronounced the word, and is often used to duplicate.
2B first draft, and then use the 2H~8B tone. HB is the pencil hardness of B H--HARD concentration, B--BLACK density number is more soft black pencil, H number is more hard color the more light was.HB. The main component of the pencil core is graphite. In fact, the pencil lead is by graphite and clay made by blending.
