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2. Pencil - Wikipedia

   en.wikipedia.org/wiki/Pencil

   A pencil ( / ˈpɛnsəl / ⓘ) is a writing or drawing implement with a solid pigment core in a protective casing that reduces the risk of core breakage and keeps it from marking the user's hand . Pencils create marks by physical abrasion, leaving a trail of solid core material that adheres to a sheet of paper or other surface.

3. Mechanical pencil - Wikipedia

   en.wikipedia.org/wiki/Mechanical_pencil

   A commonly-used mechanical pencil lead is identical in density, but not in thickness to a traditional HB (US#2) pencil lead. The hardness depends on the proportion of polymer or resin and graphite in the lead. [16] It is determined by a numerical scale: the higher the number, the harder the lead.

4. Hardnesses of the elements (data page) - Wikipedia

   en.wikipedia.org/wiki/Hardnesses_of_the_elements...

   number symbol name Mohs hardness [1] Vickers hardness ... 1.2: 26.5–44.7: 82: Pb: lead: 1.5: 38–50: 37.5–41.8 (cast) 83: Bi: ... Mohs hardness of materials ...

5. Graphite - Wikipedia

   en.wikipedia.org/wiki/Graphite

   Graphite. Graphite ( / ˈɡræfaɪt /) is a crystalline form of the element carbon. It consists of stacked layers of graphene. Graphite occurs naturally and is the most stable form of carbon under standard conditions. Synthetic and natural graphite are consumed on a large scale (1.3 million metric tons per year in 2022) for uses in pencils ...

6. Lead - Wikipedia

   en.wikipedia.org/wiki/Lead

   Lead is a chemical element; it has symbol Pb (from Latin plumbum) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point. When freshly cut, lead is a shiny gray with a hint of blue.

7. Brinell scale - Wikipedia

   en.wikipedia.org/wiki/Brinell_scale

   Brinell hardness numbers Material Hardness Softwood (e.g., pine) 1.6 HBS 10/100 Hardwood: 2.6–7.0 HBS 10/100 Lead: 5.0 HB (pure lead; alloyed lead typically can range from 5.0 HB to values in excess of 22.0 HB) Pure Aluminium: 15 HB Copper: 35 HB Hardened AW-6060 Aluminium: 75 HB Mild steel: 120 HB 18–8 (304) stainless steel annealed: 200 ...