ISO INTERNATIONAL STANDARD 6743-12 First edition 1989-11-01 Lubricants, industrial oils and related products (class L) - Classification - Part 12: Family Q (Heat transfer fluids) Lubrifiants, huiles industrielles et produits connexes (classe L) - Classification Partie 12: Famille Q (Fluides de transfert de chaleur) Reference number ISO 6743-12 : 1989 (E) by IHS under lic Not for Resale ISO 6743-12 : 1989 (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 liaison with Iso, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all mattersof electrotechnical standardization. Draft :International Standards adopted by the technical committees are circulated to thememberbodiesforapproval beforetheiracceptanceasInternational Standardsby the ISo Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 6743-12 was prepared by Technical Committee ISO/TC 28, Petroleum products and lubricants. Iso 6743 consists of the following parts, under the general title Lubricants, industrial oils and related products (class L) - C Classification: Part O: General Part 1: Family A (Total loss systems) Part 2: Family F (Spindle bearings, bearings and associated clutches) Part 3A: Family D (Compressors) Part 3B: Family D (Gas and refrigeration compressors) Part 4: Family H (Hydraulic systems) Part 5: Family T(Turbines) Part 6: Family C (Gears) Part 7: Family M (Metalworking) Part 8: Family R (Temporary protection against corrosion) Part 9: Family X (Greases) Part 10:Family Y (Miscellaneous) Part 11: Family P (Pneumatic tools) Part12:FamilyQ(Heattransferfluids) Part13:FamilyG(Slideways) ISO1989 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 . CH-1211 Geneve 20 . Switzerland Printed in Switzerland s itted without license from IHS Not for Resale ISO6743-12:1989 (E) INTERNATIONAL STANDARD Lubricants, industrial oils and related products (class L) - Classification Part 12 : Family Q (Heat transfer fluids) 1Scope 3 Explanation of symbols used This part of ISO 6743 establishes the detailed classification of 3.1 The detailed classification of family Q has been estab- family Q (heat transfer fluids). All products listed belong to lished by defining the categories of products required for the class L (Lubricants, industrial oils and related products). main applications of this family. This part of ISO 6743 should be read in conjunction with ISO 6743-0. 3.2 Each category is designated by a symbol consisting of two letters, which together constitute a code. NOTE - The first letter of the category (Q) identifies the product 2 Normative references family, i.e. fluids for heat transfer. Any following letter, taken separ- ately,has no significance of its own The following standards contain provisions which, through The designation of each category can be supplemented by the reference in this text, constitute provisions of this part of addition of viscosity grades according to ISO 3448. ISO6743.At the time of publication,the editions indicated were valid.All standards are subject to revision, and parties to agreements based on this part of so 6743 are encouraged to 3.3 In the present classification system, products are desig- investigate the possibility of applying the most recent e