Prevention Scratches

Hardness can be enhanced by applying a glass coating。
It crystallizes and hardens by adding water and heat to a special solvent.
Immediately after the application, it takes about 2 weeks to reachs the hardness of 4H and the hardness reachs to 9H. Our coatings Morse code reach a hardness of up to 7.

What is 9H？What is the difference between 7 and 7H

Maybe for some people they do not understand what 9H is.
H is JIS standard。"H" is a unit of hardness used to represent the strength of the pencil core。Many people know that there are "2B" or "HB" in the type of pencil for sure。

ＨとはHard（ハード／硬い）、
ＢとはBlack（ブラック／黒）の、
Ｆとはfirm（ファーム／しっかりとした）の略字です。

The higher the number, 3H and 4H means the harder the core and the lighter the color.
The larger the number in front of B such as 3B, 4B means the softer the core and the darker the color.

There are 17 types of pencil:
９Ｈ・８Ｈ・７Ｈ・６Ｈ・５Ｈ・４Ｈ・３Ｈ・２Ｈ・Ｈ・Ｆ・ＨＢ・Ｂ・２Ｂ・３Ｂ・４Ｂ・５Ｂ・６Ｂ.

Standard of glass coating to apply to smartphones performs "scratch test" generally using the pencil was mentioned above. It means glass coating is safe for scratching with a 9H pencil can claim "Hardness 9H".

There is another "Mohs hardness" that specifies the hardness of minerals in addition to pencil hardness.。

The Mohs hardness scale is from 1 to 10, with 2.5 for the nail and 10 for the diamond.

When comparing the Mohs hardness and the Pencil hardness, the pencil hardness of 9H corresponds to about 5 in Mohs hardness.
That means harder than platinum and softer than the knife blade。

In other words, the glass coating makes it really difficult to get scratched.