Definition: Is a numerical terminological description of paper contrast:
numbers 0-1 soft;
numbers 2 normal;
number 3 hard;
number 4-5 very hard;
number 6 ultra hard.
Similar grade number from different manufactures do not have the same characteristics.
numbers 0-1 soft;
numbers 2 normal;
number 3 hard;
number 4-5 very hard;
number 6 ultra hard.
Similar grade number from different manufactures do not have the same characteristics.
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