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Pencil hardness - is it relevant?

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Old 12-19-2017, 08:10 AM
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TOGWT
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Default Pencil hardness - is it relevant?

Pencil hardness

http://togwt1980.blogspot.co.uk/2017...materials.html

Hardness: [In materials science, hardness is the characteristic of a solid material expressing its resistance to permanent deformation. There are three principal operational definitions of hardness: Scratch hardness, Indentation hardness, Rebound or dynamic hardness]

Modern clear coat urethane even though they are harder than lacquer paints, they still scratch more easily. And because they tend to be harder it's more difficult and time consumer to remove swirls and scratches. This is the main reason to take vendor claims of ‘provides 9H hardness ‘for what it is – totally irrelevant.

How do you Measure Pencil Hardness? Standardized Procedure -
http://www.tekra.com/sites/default/f...20Hardness.pdf
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