ISO 9180:1988 PDF
Black leads for wood-cased pencils — Classification and diameters
Black leads for wood-cased pencils — Classification and diameters
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 3
- Дата публикации:
- 22 сентября 1988 г.
- Издание:
- ISO IS 9180 edition 1 version 1
- ICS:
- 01.100.40
La présente Norme internationale établit une classification et prescrit les diamètres des mines graphite utilisées pour les crayons à papier.
Abstract
Overview
ISO 9180:1988, "Black leads for wood-cased pencils - Classification and diameters," is an International Standard from ISO/TC 10 (Technical drawings) that defines how black pencil leads (graphite-based) are classified by hardness and what diameters are specified for wood-cased pencils. The standard establishes a uniform set of (from 9H to 6B) and gives minimum lead diameter requirements for groups of grades to support consistent manufacturing, performance and interchangeability.
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