ISO 9177-2-1989 标准详情
- 标准号:ISO 9177-2-1989
- 中文标题:制图自动铅笔.第2部分:石墨.分类和尺寸
- 英文标题:mechanical pencils -- part 2: black leads -- classification and dimensions
- 标准类别:国际标准化组织标准ISO
- 发布日期:1989-01-01
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 degre
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