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ISO 9177-2:1989

Mechanical pencils -- Part 2: Black leads -- Classification and dimensions

This standard has been reviewed and then confirmed in 2010 
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Abstract

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.

 

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