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Graphite Grading Scales Explained - Pencils.com
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日期：2025-06-27
The HB graphite grading scale is used to measure the hardness of a pencil's graphite core. "H" stands for "hardness," while "B" stands for "blackness." ... There are two graphite grading scales used to measure the hardness of a pencil’s graphite core. Num...看更多
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