Two types are available, black leads in which the binding agent is an organic polymer (designated by the letter "P"), and black leads in which the binding agent is clay (designated by the letter "C"). Classification is made according to the degree of hardness. Part 1 deals with the classification, dimensions, performance requirements and testing.
Revises
ISO 9177-2:1989
IN_DEVELOPMENT
ISO/DIS 9177-2
40.99
Full report circulated: DIS approved for registration as FDIS
Jul 5, 2021
Mechanical pencils for technical drawings - Part 2: Black leads - Classification and dimensions
40.60 Close of voting
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