ISO 2896-2001 Rigid cellular plastics - Determination of water absorption《硬质泡沫塑料 吸水性的测定》.pdf
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1、Reference number ISO 2896:2001(E) ISO 2001 INTERNATIONAL STANDARD ISO 2896 Third edition 2001-07-01 Rigid cellular plastics Determination of water absorption Plastiques alvolaires rigides Dtermination de labsorption deauISO 2896:2001(E) PDF disclaimer This PDF file may contain embedded typefaces. In
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3、bes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for
4、 printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2001 All rights reserved. Unless otherwise specified, no part of
5、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 either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-
6、1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2001 All rights reservedISO 2896:2001(E) ISO 2001 All rights reserved iii Contents Page Foreword.iv 1 Scope 1 2 Normative references 1 3 Principle1 4 Materials .1 5 Apparat
7、us .1 6 Specimens4 7 Procedure .5 8 Corrections for swelling and cut surfaces5 9 Expression of results 7 10 Precision and accuracy.8 11 Test report 9 Annex A (normative) Determination of average cell diameter (see 8.1.3.1) 10ISO 2896:2001(E) iv ISO 2001 All rights reserved Foreword ISO (the Internat
8、ional 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 bee
9、n 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 stand
10、ardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. 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 lea
11、st 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 2896 was prepar
12、ed by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10, Cellular plastics. This third edition cancels and replaces the second edition (ISO 2896:1987), which has been technically revised. Annex A forms a normative part of this International Standard.INTERNATIONAL STANDARD ISO 2896:2001(E)
13、ISO 2001 All rights reserved 1 Rigid cellular plastics Determination of water absorption 1 Scope This International Standard specifies a method for the determination of the water absorption of rigid cellular plastics by measuring the buoyant force on a test specimen after immersion under a 50 mm hea
14、d of water for 4 days. Corrections are specified to take account of any change in volume of the specimen and also to correct for the volume of water in the cut surface cells of the specimen. The water absorption is expressed as the average, for several specimens, of the percentage increase in volume
15、 relative to the original volume. The method described is intended for quality control and for use in product specifications. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For d
16、ated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For u
17、ndated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 291:1997, Plastics Standard atmospheres for conditioning and testing ISO 1923:1981, Cellular plastics and rubbers Determinati
18、on of linear dimensions 3P r i n c i p l e The water absorption of a material is determined by measurement of the buoyant force on a specimen immersed in distilled water for a specified time. 4 Materials 4.1 Distilled water, de-aerated (by storage for at least 48 h after distillation), for use as th
19、e immersion liquid. 5 Apparatus 5.1 Balance, accurate to 0,1 g and capable of suspending the cage (5.2). 5.2 Underwater-weighing cage, made of a stainless material not attacked by distilled water and large enough to contain a test specimen. A sinker heavy enough to compensate for the upthrust produc
20、ed by the test specimen shall be attached to the base of the cage. The cage shall be fitted with a means of suspending it from the balance. See Figure 1 for an example. 5.3 Cylindrical vessel, at least 250 mm in diameter and 250 mm in height. 5.4 Low-permeability plastic film, for example polyethyle
21、ne.ISO 2896:2001(E) 2 ISO 2001 All rights reserved Key 1 Mesh cage 2 Specimen 3S i n k e r Figure 1 Test specimen in mesh underwater-weighing cage 5.5 Slicer: cutting-blade apparatus capable of preparing thin specimens (0,1 mm to 0,4 mm thick) for cell size viewing. Figure 2 shows an acceptable appa
22、ratus. 5.6 Slide assembly, consisting of two pieces of slide glass hinged by tape along one edge, between which is placed a calibrated scale (3 cm in length) printed on a thin plastic sheet (see Figure 3). 5.7 Projector: conventional 35 mm slide projector that accepts standard 50 mm 50 mm slides, or
23、 a projection microscope with a calibrated scale.ISO 2896:2001(E) ISO 2001 All rights reserved 3 NOTE The spacer thickness is chosen to give the required viewing-specimen thickness. Figure 2 Razor-blade equipment for slicing cellular plastics for determination of average cell diameterISO 2896:2001(E
24、) 4 ISO 2001 All rights reserved Dimensions in millimetres Key 1 Calibrated glass slide 2 Flexible tape hinge 3 Blank cover glass 4 Cell-count scales Figure 3 Slide assembly 6 Specimens 6.1 Number of specimens At least three specimens shall be tested. 6.2 Dimensions Specimens shall be at least 500 c
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- ISO28962001RIGIDCELLULARPLASTICSDETERMINATIONOFWATERABSORPTION 硬质 泡沫塑料 吸水性 测定 PDF
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