Abstract / scope
Specifies bending strengths and a test method for black leads of HB hardness degree used for mechanical pencils for technical drawings.
ISO 9177-3:1994Withdrawn
Mechanical pencils — Part 3: Black leads — Bending strengths of HB leads
Porte-mine — Partie 3: Mines graphite — Résistance à la flexion des mines HB
This edition has been replaced by ISO 9177-3:2022.