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Pencil - Wikipedia


A pencil is a writing implement or art medium constructed of a narrow, solid pigment core inside ... Chemistry was in its infancy and the substance was thought to be a form of lead. ... Many people ...

pencil lead - Memidex dictionary/thesaurus


"pencil lead" definition: mixture of graphite with clay in different degrees of hardness. ... lead [Pb] | PbSO4 [chemical formula] | PbCO3 [chemical formula] | PbCl2 ...

What is the chemical composition and formula for pencil lead


The core in pencils is made of graphite. It is a form of carbon where each atom is connected to three others via sp2 covalent bonds to form 'graphene'.

What is added to graphite in order to make pencils of different ...


Clay Staedtler Product Information: (composition varies by manufacturer) Pencil type--- ... Quora User, Degree level applied chemistry + 20yr experience in corrosion prevention and water ... How do I extract pure graphite from pencil lead ?

The Unleaded Pencil - Pencils.com


The common name “pencil lead” is due to an historic association with the stylus ... Not only did the formula reduce costs, but by adjusting the ratio of clay and ...

Ferromagnetism in lead graphite-pencils and magnetic - arXiv.org


This work has been initiated with a curiosity to investigate the elemental composition and magnetic response of different grades of lead pencils (6B, 2B, HB, 2H, ...

Graphite: The mineral Graphite information and pictures


Graphite has the same chemical composition as Diamond, which is also pure ... The "lead" filling in pencils is in fact composed of a mixture of Graphite and clay.

Pencil lead - Everything2.com

everything2.com/title/Pencil lead

Mar 18, 2004 ... All wood-encased pencil leads (I don't know about mechanical pencil lead composition; it may differ) are comprised of three major ingredients ...

From what material is the lead inside a pencil made? | Reference.com


The lead inside a pencil is made of a combination of graphite and clay. Fine graphite particles are mixed with ... What is the chemical composition of a diamond?

Patent US4668572 - Pencil lead composition with magnesium ...


May 26, 1987 ... A pencil lead comprising a binder, a filler and a colorant as ... substance represented by the chemical formula: MgSO4.5MgO.8H2 O and has a ...