Published
This document specifies bending strengths and a test method for black leads of HB hardness degree used for mechanical pencils for technical drawings.
WITHDRAWN
ISO 9177-3:1994
PUBLISHED
ISO 9177-3:2022
60.60
Standard published
Jan 26, 2022
Mechanical pencils for technical drawings — Part 3: Black leads — Bending strengths of HB leads
40.60 Close of voting