ISO 20318-2:2019
Mechanical pencils and leads for general use — Classification, dimensions, quality and test methods — Part 2: Black leads
Mechanical pencils and leads for general use — Classification, dimensions, quality and test methods — Part 2: Black leads
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 11
- Дата публикации:
- 5 марта 2019 г.
- Издание:
- ISO IS 20318 edition 1 version 1
- ICS:
- 01.100.40
This document specifies classification, dimensions, quality and test methods for black leads used for mechanical pencils for general writing, as specified in ISO 20318-1.
Abstract
Overview
ISO 20318-2:2019 - Mechanical pencils and leads for general use - Part 2: Black leads specifies classification, dimensions, quality criteria and test methods for black leads (graphite cores) intended for mechanical pencils used in general writing. The document complements (mechanical pencils) and defines measurable requirements for lead diameter, length, bending strength and hardness/density evaluation to promote compatibility and consistent quality across manufacturers.
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