ISO INTERNATIONAL STANDARD 11248 First edition 1993-12-01 Plastics Thermosetting moulding materials Evaluation of short-term performance at elevated temperatures Plastiques -- Matieres a mouler thermodurcissables - Evaluation des performances a court terme aux températures élevées OSI Reference number ISO 11248:1993(E) No reproduction or ne Not for Resale ISO 11248:1993(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, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates 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 International a vote. International Standard ISO 11248 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 12, Thermosetting materials. ISO1993 or utilized in any form or by any means. electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organizationfor Standardization Case Postale 56 : CH-1211 Geneve 20 : Switzerland Printed in Switzerland ii Not for Resale oISO ISO 11248:1993(E) Introduction when the plastic materials are returned to ambient temperature. InIsO2578:1993,PlasticsDeterminationoftime-temperaturelimits after prolonged exposure to heat and similar standards, testing is carried out at ambient temperature. In such standards it is primarily the perma- nent effects of thermal oxidation on plastics exposed to elevated tem- however, are any high-temperature physical and or chemical changes that occur while the materials are exposed to the elevated temperatures. This International Standard is designed to provide data indicating how plastic materials may perform at elevated temperatures under mechanical and/or electrical stress. CopyrightIntemational Organizatin for Standardization No reproductior networking permited without license from IHS Not for Resale