6428 International Standard (ISO Technical drawings - Requirements for microcopying Dessinstechniques-Conditionsrequisespourlamicrographie First edition - 1982-12-15 SO 6428-1982 (E) UDC 744.4/.5:778.14 Ref.No.ISO 6428-1982 (E) Descriptors : technical drawings, reproduction (copying), technical documents, micrographics, generalities. Price based on 3 pages Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of developing International Standards is carried outthrough iSoO technical committees.Every memberbody interested in a subject for which a technical committee has been authorized has the and non-governmental, in liaison with iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISo Council. International Standard ISO 6428 was developed by Technical Committee ISO/TC 10, Technical drawings, and was circulated to the member bodies in February 1981. Austria Hungary Poland Belgium India Romania Canada Italy South Africa, Rep. of China Japan Spain Czechoslovakia Korea, Rep. of Sweden Denmark Netherlands United Kingdom Egypt, Arab Rep. of NewZealand USSR Finland Norway The member bodies of the following countries expressed disapproval of the document ontechnicalgrounds : Australia France Switzerland USA ? InternationalOrganizationforStandardization,1982 Printed in Switzerland Coovriaht Intermational Oraanization for Standardization ISO 6428-1982 (E) INTERNATIONALSTANDARD Technical drawings -- Requirements for microcopying Introduction 2 References Microcopying procedures allow the information contained in ISo128,Technicaldrawings-General principlesofpresenta- original technical drawings and other drawing goffice tion. documents to be reduced to smaller sizes, thus facilitating transport, handling and storage. ISo 3098/1, Technical drawings -- Lettering Part1:Cur- rently used characters. However, it should be noted that the possibility of obtaining serviceable enlargements from a microform depends above all ISO3272, Microfilming of technical drawings and other on the good quality of the microform (see IS0 3272/2) and this drawing office documents condition can be realized only if the original document is prepared in accordance with appropriate rules. Part 1 : Operating procedures.1 Usually, the original is a drawing or associated document Part 2: Quality criteria and control. may also be a combination of these methods. Part 3: Unitized 35 mm microfilm carriers. The draughtsman already has at his disposal several Interna- ISo5457,Technical drawings-· Sizes and layout of drawing tional Standards (such as 1SO 128, ISO 3098, ISO 5457) con- sheets. taining general rules of execution which allow the establish- ment of documents for good reproduction. Nevertheless, for microcopying, these rules should be expanded. 3 Requirements of execution The purpose of this International Standard is to compile in one document the rules to be observed when executing original documents aliowing for the establishment of microforms 3.1 Drawing sheets yielding legible enlargement copies. 3.1.1 Bianks or pre-printed sheets for drawings or other Due to the fact that the instructions of this International Stan- documents may be transparent, translucid or opaque, but shall dard are more extensive than those for other methods of preferably be matt on the face used for drafting and/or letter- reproduction, it follows that documents complying with the re- ing. Their quality shall be chosen in view of obtaining the best quirements for microcopying can also be reproduced without possible contrast between background and lines (see3.2.1). difficulty by any other reprographic system. NOTE- Due to its good qualities relating to dimensional stability, durability,erasability and draftability,polyester drafting film (minimum