ISO INTERNATIONAL STANDARD 9771 Second edition 1995-05-01 PlasticsPhenolicresins Determination of the pseudo-adiabatic temperature rise of liquid resols when cured under acid conditions Plastiques Resines phenoliques Determination de I'elevation de temperaturepseudoadiabatique des resols liquides thermodurcis en conditions acides ISO Reference nurnber ISO9771:1995(E) ISO9771:1995(E) Foreword IsQ (the International Organization for Standardization) is a worldwide federation of national standards bodies (lsO 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 ot electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting avote ISO/TC 61,Plastics,SubcommitteeSC12,Thermosettingmaterials. This second editioncancels andreplaces the first edition (ISO 9771:1989), of which it constitutes a minor revision. ISO All rights reserved. Unless otherwise specified, 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 ii INTERNATIONAL STANDARD ISO IS09771:1995(E) Plastics Phenolic resins Determination of the pseudo-adiabatic temperature rise of liquid resols when cured under acid conditions 4.2Hollowfoamblock,madeof phenolic-resin on 1 Scope polyurethane-resin foam with an apparent density of 30kg/m3to50kg/mandwitha cavitytoaccommo- This International Standard specifies a method for date the reaction vessel (4.1). determining the exothermic reactivity of thermo- setting liquid phenolic resins when mixed with an acid The cavity shall be arranged so that the surface of the hardener under specificd conditions. The results of reactionmixture lies about 30mm below the top the dctermination are used as a means of assessing edge of the foam block and so that the reaction vessel the behaviour of the resin during processing. sits firmly in the foam material. The thickness of the thermal-insulation layer between 2Principle the reaction vessel and its surroundings shall be at A phenolic resin is mixed with an acid hardener and least 60 mm. allowed to harden.The highest temperature reached is measured, as well as the time taken to reach this periodically since wear of the block can affect the test re temperature. sult. 3 Reagent 4.3 Non-metallic cover plate,for the foam block (4.2). 3.1 Suitable acid hardener, depending on the 4.4Thermocouple, with its hot junction immersed composition of the resin, e.g. p-phenol sulfonic acid, in glycol or other suitable liquid at the bottom of a test technical grade, 65 % (m/m) ± 1 % (m/m) in water. tube (4.7). Apparatus (see figure 1) 4.5Temperaturerecorder 4 4.6Pipette, nominal capacity 10 ml. 4.1 Reaction vessel: paper cup impregnated with polyethylene, with the following dimensions: 4.7 Test tube, 60 mm x @ 16 mm, containing 2 ml of glycol or other suitable liquid. -diameteratbase:about60mm 4.8 Stirring device: mechanical or hand stirrer. -diameteratrim:about70mm 4.9 Balance, accurate to 0.2 g. -height:about60mm oISO ISO9771:1995(E) Dimensions in millimetres Thermocouple connected to temperature recorder Coverplatc 60 @ 70 Reaction vessel Test tube 21 Reaction composition (resin) Foamblock Glycolor other suitable liquid @190 Figure 1Schematic diag