ISO 9177-3:2022
International Standard
Current Edition
·
Approved on
26 January 2022
·
Mechanical pencils for technical drawings — Part 3: Black leads — Bending strengths of HB leads
ISO 9177-3:2022 Files
null Pages
Current Edition
ISO 9177-3:2022 Scope
This document specifies bending strengths and a test method for black leads of HB hardness degree used for mechanical pencils for technical drawings.
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