1、Plastics Aromatic isocyanates for use in the production of polyurethane Determination of acidity AMENDMENT 1 Plastiques Isocyanates aromatiques utiliss pour la production de polyurthanne Dtermination de lacidit AMENDEMENT 1 ISO 2011 AMENDMENT 1 2011-11-01 Reference number ISO 14898:1999/Amd.1:2011(E
2、) First edition 1999-10-15 ISO 14898 INTERNATIONAL STANDARDISO 14898:1999/Amd.1:2011(E)COPYRIGHT PROTECTED DOCUMENT ISO 2011 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 pho
3、tocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Sw
4、itzerland ii ISO 2011 All rights reservedForeword 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 b
5、ody 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 Electro
6、technical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted
7、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 a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent r
8、ights. ISO shall not be held responsible for identifying any or all such patent rights. Amendment 1 to ISO 14898:1999 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 12, Thermosetting materials. ISO 14898:1999/Amd.1:2011(E) ISO 2011 All rights reserved iiiISO 14898:1999/Amd.
9、1:2011(E) Plastics Aromatic isocyanates for use in the production of polyurethane Determination of acidity AMENDMENT 1 Page 1, Normative references Replace all the references, except for ISO 3696:1987, by undated references. Page 2 Replace Clause 7 “Test conditions” by the following clause: 7 Sampli
10、ng and test conditions 7.1 Sampling Since organic isocyanates react with atmospheric moisture, take special precautions in sampling (see also warning below). Usual sampling methods (for example sampling an open drum with a thief), even when conducted rapidly, can cause contamination of the sample wi
11、th insoluble ureas. Therefore, blanket the sample with a dry inert gas (e.g. nitrogen, argon or dried air) at all times. 7.2 Test conditions For the same reason, keep the laboratory humidity low, preferably below 50 % relative humidity. WARNING Organic isocyanates are hazardous when absorbed through
12、 the skin or when the vapours are breathed in. Provide adequate ventilation and wear protective gloves and eyeglasses. Page 4, Subclause 10.2, and page 6, Subclause 11.2 Change the explanation of the symbol F used in the equation in each of these subclauses to the following: F is 36 500 = 36,5 (molar mass of HCl) 1 000 (factor to change mg/g to g/g); ISO 2011 All rights reserved 1ISO 14898:1999/Amd.1:2011(E) ISO 2011 All rights reserved ICS 83.080.10 Price based on 1 page
