Abstract / scope
This document specifies classification, dimensions, quality and test methods for black leads used for mechanical pencils for general writing, as specified in ISO 20318-1.
ISO 20318-2:2019Published
Mechanical pencils and leads for general use — Classification, dimensions, quality and test methods — Part 2: Black leads
Porte-mines et mines pour usage général — Classification, dimensions, qualité et méthodes d'essai — Partie 2: Mines graphite pour porte-mines