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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 ...

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' sheets; ...

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 ...

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, ...

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?

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.

What Is The Chemical Formula Of Pencil Lead? - Blurtit


Answer (1 of 2): C, the lead in a pencil is graphite, a pure form of carbon. To vary the hardness of pencils, ground graphite may be mixed with varying amounts of ...

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 ...

Patent US5118345 - Composition for the preparation of pencil lead ...


Jun 2, 1992 ... In a composition for the manufacture of fired pencil lead which .... water and plasticized with 2% polyglycol having a molecular weight of 6,000.

Lead Hardness | Pencyclopedia | Cult Pens


The Cult Pens Guide to Pencil Lead Hardness ... Dave's Mechanical Pencils; The Pencil Lead page at everything2 has more on grades and lead composition.

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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 ... Written May 2, 2013. Clay ... Why is the black thing in a pencil called "lead" while actually it's graphite? Why is graphite used in pencil...

Pencil lead - Everything2.com


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

The Unleaded Pencil: What's Really Inside a Pencil? - Pencils.com


Here's a myth buster: there is no lead in pencils. ... Not only did the formula reduce costs, but by adjusting the ratio of clay and graphite powder, the changing  ...