ISO INTERNATIONAL STANDARD 8302 First edition 1991-08-01 Thermal insulation - Determination of steady-state thermal resistance and related properties -- Guarded hot plate apparatus Isolation thermique - Determination de la resistance thermique et des proprietes connexes en regime stationnaire -- Methode de la plaque chaude gardee Reference number ISO 8302:1991(E) IHS Not for Resale d without license from IHS ISO 8302:1991(E) Contents Page Section 1 General 1.1 Scope 1.2 Normative references Definitions 1.3 1.4 Symbols and units 3 1.5 Significance 4 Principle 1.6 5 1.7 Limitations due to apparatus Limitations due to specimen 1.8 8 Section 2 Apparatus and error evaluation 11 2.1 Apparatus description and design requirements 11 2.2 Evaluation of errors 18 2.3 Apparatus design 20 2.4 Performance check 22 Section 3 Test procedures 25 3.1 General 25 3.2 Test specimens 26 3.3 Test method 28 3.4 Procedures requiring multiple measurements 30 3.5 Calculations 31 3.6 Test report 32 C ISO 1991 or by any means, electronic or mechanical, Including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardizatton Case Postale 56: CH-1211 Geneve 20 · Swltzerland Printed in Switzerland Copyright International OrganizationforStandardization se from IHS Not for Resale ISO 8302:1991(E) Annexes Limit values for apparatus performance and testing conditions A 34 B Thermocouples 37 Maximum specimen thickness c 39 D Bibliography 46 Copyright InternationalOrganization for Standardization iii ewithISC Not for Resale No reproduct etworking permitted without license from IHS