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Old 19-12-2017, 11:53 AM   #1
TOGWT
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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.
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Old 19-12-2017, 12:08 PM   #2
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To add to this it is worth noting that there is no defined "standard" for both hardness and blackness of pencils. So one manufacturers 9H or HB pencil will not necessarily be the same as another's.
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Old 20-12-2017, 11:26 AM   #3
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Quote:
Originally Posted by SBM View Post
To add to this it is worth noting that there is no defined "standard" for both hardness and blackness of pencils. So one manufacturers 9H or HB pencil will not necessarily be the same as another's.
Use a Pencil set designed for pencil hardness testing – common brands include Mitsubishi UNI
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Old 20-12-2017, 01:05 PM   #4
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am i the only one who laughed like a school kid when i saw the title

surely its not just the hardness but length of the pencil too?! longer the better for value
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Old 21-12-2017, 11:37 AM   #5
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am i the only one who laughed like a school kid when i saw the title

surely its not just the hardness but length of the pencil too?! longer the better for value
YES

It's not the size that matters as long as there's lead in it
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Old 02-01-2018, 05:46 PM   #6
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Feynlab done a great peice on hardness. Substrate is tr most important factor, when coatings are tested it’s done on a solid metal plate which is how they get the famous 9h from but as above, in the real world it don’t mean jack
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