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ISO 9177-2:1989

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

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Kehtetu alates 01.06.2022
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Staatus
Kuupäev
Tüüp
Nimetus
01.06.2022
Põhitekst
16.03.1989
Põhitekst
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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