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After doing some testing on various coatings for their 'pencil hardness', I was surprised at the results I got. I thought I would share this information with those who may have their own opinions about what they consider to be hard and durable coatings.
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www.pencilpages.com/articles/simmons.htm
www.pencilpages.com/articles/simmons.htm
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Pencil - Wikipedia, the free encyclopedia
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A pencil is a writing or drawing device consisting of a slippery, thin stick of pigment (usually graphite, but can also be colored pigment or charcoal) and clay, usually encased in a thin wood cylin...
en.wikipedia.org/wiki/Pencil
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Have you ever noticed that some pencils write with really light lines and some pencils come out smudgy and dark? The cause of this can be explained by what type of lead the pencil has. Leads range from hard, light-marking leads to soft, ... Top » Catalog » Article: Picking the Perfect Pencil Lead Hardness...
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www.jetpens.com/cms.php/content/Article:_Picking_the_Pe...
www.jetpens.com/cms.php/content/Article:_Picking_the_Perfect_Pencil_Lead_Hardness
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Pencil lead is graded by hardness: a greater percentage of clay results in a harder lead. H (harder), F, HB and B (softer) are pencils of average hardness. ...
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www.jetpens.com/product_info.php/cPath/99_210/products_...
www.jetpens.com/product_info.php/cPath/99_210/products_id/726
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The hardness of the lead is indicated by a number (1 to 4) stamped on the side of most pencils--the higher the number, the harder the lead. Sometimes there are other markings: H indicates hard, B indicates the blackness of the pencil's mark, and F indicates that the pencil can sharpen to a fine point.
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pubs.acs.org/cen/whatstuff/stuff/7942sci4.html
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The Micro-Metrics Pencil Hardness Gage/Gauge design allows the user to force pencil leads of increasing hardness values against a coated surface in a precisely defined manner until one lead mars the surface. Surface hardness is defined by the hardest pencil grade that fails to mar the painted or coated surface.
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www.micro-metrics.com/h501.htm
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PencilThings.com has variety of mechanical pencil leads including standard, red, orange, green, blue and purple. The density of these leads include 2H, HB, 2B, 4B and 6B perfect for any artist, drafter and children. ... No matter what the size of your mechanical pencil is, Pencil Things has the right lead for you.
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www.pencilthings.com/pencil-leads/
www.pencilthings.com/pencil-leads/
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Not only did it reduce cost of the leads, but by adjusting the ratio of clay and graphite powder in the formula the changing hardness of the lead allowed more control of the lightness and darkness of the graphite mark left on the paper. ... The hardness of the graphite core is usually marked on the pencil with a number such as 2,
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www.pencils.com/pencil-information/pencil-lead
www.pencils.com/pencil-information/pencil-lead
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Acronym expansions, definitions, links, and opinions. ... Somebody ought to study that biobehaviorally.'' The bad guys think they're clever, but nothing gets past the men in pencil blue. ``Information Transfer'' for a newsletter? Who do these people think they're fooling?
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www.plexoft.com/SBF/H.html
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