ISO 20318-2:2019
ISO 20318-2:2019 Mechanical pencils and leads for general use - Classification, dimensions, quality and test methods - Part 2: Black leads
standard by International Organization for Standardization, 03/01/2019
Full Description
ISO 20318-2:2019 specifies classification, dimensions, quality and test methods for black leads used for mechanical pencils for general writing, as specified in ISO 20318-1.