SANS 9180-2009 Black leads for wood-cased pencils - Classification and diameters《木壳铅笔的黑色铅芯 分类及直径》.pdf

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1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-23001-2 SANS 9180:2009Edition 1ISO 9180:1988Edition 1SOUTH AFRICAN NATIONAL STANDARD Black leads for wood-cased pencils Classification and

4、 diameters This national standard is the identical implementation of ISO 9180:1998 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X 191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27

5、12 344 1568 www.sabs.co.za SABS SANS 9180:2009 Edition 1 ISO 9180:1998 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS TC 1007, Stationery and office requisites, in accordance with procedures of the SABS Standards

6、 Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in October 2009. INTERNATIdNAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXflYHAPOflHAfl OPi-AHM3ALi papier - Classification et diam&tres IS0 9

7、180 First edition 1988-10-01 Reference number IS0 9180: 1988 (E) SANS 9180:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Iso 9180 : 1988 (El Foreword IS0 (the International Organization for Standardization) is a worldwide federation of

8、national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. Inte

9、rnational organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical

10、committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 9180 was prepared by Technic

11、al Committee ISOITC 10, Technical drawings. 0 International Organization for Standardization, 1988 0 Printed in Switzerland SANS 9180:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD IS0 9180 : 1988 (E) Black leads f

12、or wood-cased pencils - Classification and diameters 1 Scope This International Standard specifies a classification and diameters for black leads used for wood-cased pencils. 2 Definitions For the purposes of this International Standard, the following definitions apply. 2.1 black lead : Solid writin

13、g material which consists of carbon (e.g. graphite) and a binding agent. The lead generates black lines which are erasable. 2.2 hardness degree : Classification indicating increasing hard- ness from 6B to 9H and increasing line density from 9H to 6B. NOTE - A scientific definition of hardness degree

14、 is not yet available. 2.3 wood-cased pencil: Hand-held drawing tool which has the lead permanently secured in a wood case and which is capable of withstanding the force involved in drawing. 3 Classif ication Leads shall be classified according to their hardness degree into the following 17 types: 9

15、H, 8H, 7H, 6H, 5H, 4H, 3H, 2H, H, F, HB, B, 2B, 3B, 4B, 5B and 6B 4 Diameters Lead diameters shall be as specified in table 1. Table 1 - Diameters Hardness degree (see 2.2) Diameter mm 9H, BH, 7H, 6H, 5H, 4H, 3H, 2H, H I,8 F, HB, B, 28, 3B, 4B, 5B, 6B 2 SANS 9180:2009This s tandard may only be used

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