ISO 9177-3:2022
Mechanical pencils for technical drawings — Part 3: Black leads — Bending strengths of HB leads
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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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Bending strength
4.1 General
4.2 Bending strength of HB leads for mechanical pencils
5 Test method
6 Test report
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Bending strength
4.1 General
4.2 Bending strength of HB leads for mechanical pencils
5 Test method
6 Test report
Bibliography