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Mechanical pencils for technical drawings - Part 3: Black leads - Bending strengths of HB leads

Overview ISO 9177-3:2022 specifies bending strengths and a test method for black leads of HB hardness used in mechanical pencils for technical drawings. The standard defines minimum bending strength…

Mechanical pencils for technical drawings — Part 3: Black leads — Bending strengths of HB leads

Overview ISO 9177-3:2022 specifies bending strengths and a test method for black leads of HB hardness used in mechanical pencils for technical drawings. The standard defines minimum bending strength…

Mechanical pencils — Part 3: Black leads — Bending strengths of HB leads