1、 Reference number ISO 29768:2008(E) ISO 2008INTERNATIONAL STANDARD ISO 29768 First edition 2008-11-01 Thermal insulating products for building applications Determination of linear dimensions of test specimens Produits isolants thermiques destins aux applications du btiment Dtermination des dimension
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5、tral Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 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 permissio
6、n 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 Switzerland ii ISO 2008 All rights reservedI
7、SO 29768:2008(E) ISO 2008 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Terms and definitions. 1 3 Principle. 1 4 Apparatus 1 5 Test specimens . 2 6 Procedure 3 7 Calculation and expression of results 5 8 Accuracy of measurement. 5 9 Test report . 5 Bibliography . 6
8、ISO 29768:2008(E) iv ISO 2008 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
9、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
10、 Electrotechnical 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
11、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 a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of
12、patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 29768 was prepared by Technical Committee ISO/TC 163, Thermal performance and energy use in the built environment, Subcommittee SC 1, Test and measurement methods. ISO 29768:2008(E) ISO 2008 All right
13、s reserved v Introduction This International Standard comprises the original EN 12085:1997 prepared by Technical Committee CEN/TC 88, Thermal insulating materials and products, which has been amended by ISO/TC 163/SC 1 with reference to conditioning and testing conditions in tropical countries. This
14、 International Standard is one of a series of documents specifying test methods, based on existing European Standards, that are being adopted by ISO. This “package” of standards includes the following group of interrelated documents. International Standard Respective EN standard ISO 29465, Thermal i
15、nsulating products for building applications Determination of length and width EN 822 ISO 29466, Thermal insulating products for building applications Determination of thickness EN 823 ISO 29467, Thermal insulating products for building applications Determination of squareness EN 824 ISO 29468, Ther
16、mal insulating products for building applications Determination of flatness EN 825 ISO 29469, Thermal insulating products for building applications Determination of compression behaviour EN 826 ISO 29470, Thermal insulating products for building applications Determination of the apparent density EN
17、1602 ISO 29471, Thermal insulating products for building applications Determination of dimensional stability under constant normal laboratory conditions (23 C/50 % relative humidity) EN 1603 ISO 29472, Thermal insulating products for building applications Determination of dimensional stability under
18、 specified temperature and humidity conditions EN 1604 ISO 29764, Thermal insulating products for building applications Determination of deformation under specified compressive load and temperature conditions EN 1605 ISO 29765, Thermal insulating products for building applications Determination of t
19、ensile strength perpendicular to faces EN 1607 ISO 29766, Thermal insulating products for building applications Determination of tensile strength parallel to faces EN 1608 ISO 29767, Thermal insulating products for building applications Determination of short- term water absorption by partial immers
20、ion EN 1609 ISO 29768:2008(E) vi ISO 2008 All rights reservedISO 29768, Thermal insulating products for building applications Determination of linear dimensions of test specimens EN 12085 ISO 29769, Thermal insulating products for building applications Determination of behaviour under point load EN
21、12430 ISO 29770, Thermal insulating products for building applications Determination of thickness for floating-floor insulating products EN 12431 ISO 29771, Thermal insulating materials for building applications Determination of organic content EN 13820 ISO 29803, Thermal insulation products for bui
22、lding applications Determination of the resistance to impact of external thermal insulation composite systems (ETICS) EN 13497 ISO 29804, Thermal insulation products for building applications Determination of the tensile bond strength of the adhesive and of the base coat to the thermal insulation ma
23、terial EN 13494 ISO 29805, Thermal insulation products for building applications Determination of the mechanical properties of glass fibre meshes EN 13496 INTERNATIONAL STANDARD ISO 29768:2008(E) ISO 2008 All rights reserved 1 Thermal insulating products for building applications Determination of li
24、near dimensions of test specimens 1 Scope This International Standard specifies the characteristics and choice of measuring equipment and the procedure for determining the linear dimensions of test specimens that are taken from thermal insulating products. The procedures for measuring the dimensions
25、 of full-size products are specified in ISO 29465 and ISO 29466. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 linear dimension distance between two points, between two parallel lines or between two parallel planes, defined by corners, edge
26、s or surfaces of the test specimen 2.2 test specimen single item or part of an item used for a test 3 Principle The linear dimensions of a test specimen are measured using an apparatus giving the required degree of accuracy. 4 Apparatus Any test equipment which provides the same result with at least
27、 the same accuracy may be used. 4.1 Flat surface, larger than the largest dimensions of the test specimen. 4.2 Dial gauge, permitting reading to at least 0,05 mm. The measuring surface shall be of such a size that the total resultant measuring pressure u 1 kPa. NOTE The measuring pressure of the dia
28、l gauge can be reduced by removing the spring. The dial gauge, or any other electrical or optical measuring instrument having at least the same accuracy, can be fixed to a device to adapt the testing equipment to the size of the test specimen. 4.3 Micrometer, permitting readings to at least 0,05 mm.
29、 A micrometer shall be used only if it incorporates a device that indicates the onset of the force applied by the micrometer when it contacts the test specimen surface. An example of such a device is an electrical circuit, consisting of a flexible wire, battery, lamp and an aluminium plate exerting
30、a pressure of (50 1,5) Pa on the test specimen, as shown in Figure 1. ISO 29768:2008(E) 2 ISO 2008 All rights reservedKey 1 screw micrometer 2 millimetre scale 3 adjustable support 4 lamp 5 battery 6 aluminium plate, 10 cm 27 test specimen 8 base plate Figure 1 Example of a suitable micrometer 4.4 S
31、liding caliper, permitting readings to at least 0,1 mm. The sliding caliper shall be used only if it does not cause any deformation of the test specimen. 4.5 Metal rule or metal tape, graduated in millimetres and permitting reading to at least 0,5 mm. 5 Test specimens The number, dimensions and cond
32、itioning of test specimens shall be as defined in the relevant test method standard or any other international or European technical specification. In tropical countries, different conditioning and testing conditions can be relevant. In this case, the conditions shall be 27 C and 65 % RH and be stat
33、ed clearly in the test report. ISO 29768:2008(E) ISO 2008 All rights reserved 3 6 Procedure 6.1 Test conditions The test conditions shall be as defined in the relevant test method standard or any other international or European technical specification. In tropical countries, different conditioning a
34、nd testing conditions can be relevant. In this case, the conditions shall be 27 C and 65 % RH and be stated clearly in the test report. 6.2 Choice of measuring equipment The choice of measuring equipment shall be in accordance with the required accuracy of the measured value as given in the relevant
35、 test method standard or any other international or European technical specification. Where no such standard or specification exists, the required accuracy shall be agreed between parties, but it shall correspond to the dimensions being measured. If the required accuracy of the dimension is expresse
36、d in millimetres, the choice of the equipment shall be as shown in Table 1. Table 1 Required accuracy expressed in millimetres Required accuracy Measuring equipment Readings to the nearest Median of readings at each position rounded to the nearest mm mm mm 0,1 dial gauge or micrometera0,05 0,1 0,2 s
37、liding caliperb0,1 0,2 1,0 metal tape or rulec0,5 1,0 aA dial gauge shall be used only if the result is unaffected by dial gauge pressure up to 1 kPa. bA dial gauge or a micrometer may also be used, but then it is not necessary for the instrument accuracy to be better than that of a sliding caliper.
38、 cA sliding caliper or even a dial gauge or micrometer may be used, but then it is not necessary for the instrument accuracy to be better than that of the metal tape or rule. Table 2 shall be used to provide the means for the selection of the equipment used where the accuracy is expressed in percent
39、age terms. The choice depends on both the required accuracy and on the test specimens dimensions. Table 2 Required accuracy expressed in percent Measuring equipment/range of dimensions Required accuracy % 20 mm to 100 mm 0,5 to 1 dial gauge or micrometerasliding caliperbmetal tape or rulec1 to 2 sli
40、ding caliperbsliding caliperbmetal tape or rulecW 2 sliding caliperbmetal tape or rulecmetal tape or rulecaA dial gauge shall be used only if the result is unaffected by dial gauge pressure up to 1 kPa. bA dial gauge or a micrometer may also be used, but then it is not necessary for the instrument a
41、ccuracy to be better than that of a sliding caliper. cA sliding caliper or even a dial gauge or micrometer may be used, but then it is not necessary for the instrument accuracy to be better than that of the metal tape or rule. ISO 29768:2008(E) 4 ISO 2008 All rights reserved6.3 Number and location o
42、f measurements The number of the measuring locations shall depend on the size and the shape of the test specimen, but shall be at least two. The locations shall be as widely separated as possible, in order to give a good mean value. If the median of three readings at each position is taken, the mean
43、 shall be calculated from the two or more median values. NOTE The median value at each position is taken because it is easier to keep in mind the majority of the measured values instead of noting all single values and calculating the mean value. 6.4 Measurement with dial gauge The measurement shall
44、be made with the test specimen placed on a flat surface. The measurements shall be made with and without the test specimen. The difference between the two measurements gives one reading. All readings shall be made to the nearest 0,05 mm. The mean value calculated shall be rounded to the nearest 0,1
45、mm. 6.5 Measurement with micrometer The measurement shall be made with the test specimen placed on a flat surface. The micrometer shall be fixed to an adjustable support (see Figure 1). The measuring point of the micrometer shall be screwed down continuously until it just touches the test specimen,
46、as indicated by the surface contact device. The measurements shall be made with and without the test specimen. The difference between the two measurements gives one reading. All readings shall be made to the nearest 0,05 mm. The mean value calculated shall be rounded to the nearest 0,1 mm. 6.6 Measu
47、rement with a sliding caliper The caliper shall be progressively preset to smaller measurements and presented to the test specimen until the setting is reached when the caliper measuring faces just touch the surface of the test specimen without causing any deformation. All readings shall be made to
48、the nearest 0,1 mm. The mean value calculated shall be rounded to the nearest 0,2 mm. 6.7 Measurement with metal rule or metal tape The test specimen shall not be distorted or damaged by the application of the metal rule or metal tape. All readings shall be made to the nearest 0,5 mm. The mean value
49、 calculated shall be rounded to the nearest 1 mm. ISO 29768:2008(E) ISO 2008 All rights reserved 5 7 Calculation and expression of results The calculation of results shall be as defined in Clause 6. 8 Accuracy of measurement NOTE It has not been possible to include a statement of the accuracy of measurement in this edition of this International Standard, but it is intended to include such a statement when this International Standard is next revised. 9 Test report The test report shall
