ISO-9177-3 › Mechanical pencils for technical drawings - Part 3: Black leads - Bending strengths of HB leads

ISO-9177-3 - 2ND EDITION - CURRENT
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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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Document Number

ISO 9177-3:2022

Revision Level

2ND EDITION

Status

Current

Publication Date

Feb. 1, 2022

Committee Number

ISO/TC 10