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ISO 9177-2:2022

Current Date published:

Mechanical pencils for technical drawings — Part 2: Black leads — Classification and dimensions

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”).

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ISO 9177-2:2022

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