This document specifies a classification and dimensions for black leads used for mechanical pencils for technical drawings.
Two types of black leads are available:
— polymer leads (designated by the letter “P”);
— ceramic leads (designated by the letter “C”).
Buy this standard
|std 1 40||PDF + ePub|
|std 2 40||Paper|
ISO 9177-2:2022Stage: 60.60
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