![]() ![]() Pencils are graded in 9 number and 3 letters. This damage might be very small, depending on the pencil and the grade. If the pencil is hard enough, it will permanently damage the surface it is pressed on while the pressure is transferred onto the surface underneath. When a pencil with a very low hardness (grade 9B) is pressed on a hard surface (such as paintwork) the graphite will deform under the pressure. The difference is done by softening the graphite in the pencil. It also give the user more control over the shade by using more or less pressure. This is done because a pencil with a different grade gives a slightly different darkness when used while drawing. The confusion with most consumers is often used by manufacturer because the customer thinks they are talking about the Mohs scale, even thought the actual number refers to the pencil scale. “9H” is the highest scale in the pencil scale, but is noticeably lower in comparison to the hardness of a diamond. Unfortunately, the pencil scale also has scores that as written in the same way. A diamond (the hardest material known) has a score of 10. The Mohs scale is used to determine the toughness of a certain material, and goes from 1H to 9H. The most common scales used for a test like this is either the pencil scale, of the Mohs scale. ![]() However, it is not always clear what scale is used to determining the hardness. A harder/tougher coating would withstand more wear and tear and offers better scratch resistance. ![]() The higher the number, the harder the coating is. Some claim their product has a hardness of 10H, 9H or 8H. In the world of detailing it is very common to see a coating with a hardness being mentioned. Different types of determining the hardness ![]()
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