ISO INTERNATIONAL STANDARD 9961 First edition 1992-06-01 Draughting media for technical drawings Natural tracing paper Supports de tragage pour dessins techniques - Papier calque naturel Referencenumber ISO 9961:1992(E) Copyright Intemational Organization for Standardizatior Noreproduction or networking permited without license from IHS Not for Resale ISO 9961:1992(E) Foreword iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (Iso member bodies). The work of preparing International Standards is normally carried out through Iso 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. International organizations, govern- mental and non-governmental, in tiaison with Iso, also take part in the work. Iso colliaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- bodies casting a vote. Internationai Standard Iso g961 was prepared by Technical Committee Iso/Tc 1o, Technical drawings, product definition and related documen- tation, Sub-Committee sc 9, Media and equipment for drawing and re- lateddocumentation. Annexes A and B form an integral part of this International Standard. ISO 1992 or by, any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardizatlon Case Postale 56·CH-1211Geneve 20·Switzerland Printed in Swltzerland No reproduction or networking permited without icense from IHS Not for Resale INTERNATIONAL STANDARD ISO 9961:1992(E) Draughting media for technical drawings - Natural tracing paper Scope Iso 536:1976, Paper and board - Determination of grammage. This International Standard specifies the minimum requirements for draughting media made from iso 1974:1990, Paper - Determination of tearing re- naturat tracing paper. It details qualities necessary sistance (Elmendorf method). for draughting and reproduction, and specifies ap- propriate test methods for the most commonly used iso 2469:1977, Paper, board and pulps - Measure- grammages,within the, range 40,g/m² to 160 g/m², ment of diffuse reflectance factor. i.e. 62,5 g/m², 72,5 g/m², 92,5 g/m² and 112,5 g/m². Iso 4046:1978, Paper, board, pulp and related terms - Vocabulary. 2 Normative references Iso 5457:1980, Technical drawings - Sizes and lay- out of drawing sheets. The following standards contain provisions which, through reference in this text, constitute provisions Iso 5627:1984, Paper and board -- Determination of of this International Standard. At the time of publi- smoothness (Bekk method). cation, the editions indicated were valid. All stan- dards are subject to revision, and parties to Iso 5630-1:1991, Paper and board - Accelerated agreements based on this International Standard ageing --- Part 1: Dry heat treatment at 105 "c. are encouraged to investigate the possibility of ap- plying the most recent editions of the standards in- Iso 8791-2:1990, Paper and board - -Determination dicated below. Members of IEC and ISO maintain of roughness/smoothness (air leak methods) registers of currently valid International Standards. Part 2: Bendtsen method. iso 5-2:1991, Photography --- Density measurements Iso 9175-1:1988, Tubular tips for hand-held technical Part 2: Geometric conditions for transmission pens using India ink on tracing paper - Part 1: density. Definitions, dimensions, designation and marking. Iso 186:1985, Paper and board - Sampling to deter- Iso 9175-2:1988, Tubular tips for hand-held technical mine average quality. pens using India ink on tracing paper -- Part 2: Per- formance, test parameters and test conditions. Iso 187:1990, Paper, board and pulps -- Standard atmosph