1、INTERNATIONAL STANDARD ISO 6187 First edition 2001-09-15 Reference number ISO 6187:2001(E) ISO 2001 Rigid cellular plastics Determination of friability Plastiques alvolaires rigides Dtermination de la friabilitISO 6187:2001(E) ii ISO 2001 All rights reserved PDF disclaimer This PDF file may contain
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6、office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 734 10 79 E-mail copyrightiso.ch Web www.iso.ch Printed in SwitzerlandISO 6187:2001(E) ISO 2001 All rights reserved iii Contents Page 1 Scope . 1 2 Normative reference . 1 3 Terms and definitions 1 4 Apparatus . 1 5 Test spe
7、cimens . 2 6 Procedure . 2 7 Calculation 2 8 Precision and bias 3 9 Test report 3 Bibliography. 4ISO 6187:2001(E) iv ISO 2001 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of
8、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,
9、 in liaison with ISO, also take part in the work. ISO collaborates closely with the International 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 3. Draft Inte
10、rnational 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 a vote. Attention is drawn to the possibility that some of the elements of this Internation
11、al 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 6187 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10, Cellular plastics.INTERNATIONAL STANDARD ISO 6187:2001(E) ISO
12、 2001 All rights reserved 1 Rigid cellular plastics Determination of friability WARNING This International Standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and healt
13、h practices and determine the applicability of regulatory limitations prior to use. 1 Scope This International Standard specifies a method for the determination of the mass loss of rigid cellular plastics as a result of a combination of abrasion and impact produced by a laboratory tumbling mechanism
14、. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agree
15、ments based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers
16、of currently valid International Standards. ISO 845:1988, Cellular plastics and rubbers Determination of apparent (bulk) density. 3 Terms and definitions For the purposes of this International Standard, the following terms and definitions apply. 3.1 cellular plastic a plastic whose density is reduce
17、d by the presence of numerous small cavities (cells), interconnecting or not, dispersed throughout the mass 3.2 friability the amount of cellular plastic that will crumble or crush into powder when in contact with another surface 4A p p a r a t u s 4.1 Box Use a cubical box of oak wood, having insid
18、e dimensions of by by and mounted rigidly at the centre of one by end on a rotatable horizontal shaft so that the axis of the shaft is normal to the end face of the box. One side of the box shall be hinged as a door and shall be gasketed to be dust-tight. The box shaft shall be capable of being moto
19、r driven at a constant speed of ( ) revolutions per minute. 190 mm 197 mm 197 mm 197 mm 197 mm 60 2ISO 6187:2001(E) 2 ISO 2001 All rights reserved 4.2 Cubes Twenty-four laboratory-conditioned, solid oak cubes shall be placed in the box with the test specimens. The density of the oak cubes shall be a
20、pproximately . Number each group of wood cubes 1 to 24. At the end of every 600-revolution test, remove one “used” cube (follow the number sequence and remove the oldest cube) and replace with a correspondingly numbered “new” cube. In this manner, cube wear is eliminated as an uncontrolled variable
21、in the test method. When the corners of the wood cubes have been worn so that the radius of curvature is greater than or the cubes have become altered so as not to be compatible with new cubes, they shall be discarded and new ones used. A conventional machinists radius gauge may be used for checking
22、 the edge wear. 5 Test specimens Using a fine-tooth saw, cut out three sets of twelve cubes. Test twelve cubes at a time, cut from the same piece of the cellular plastic. When a flat product has special surfaces due to treatment or moulding, cut each cube to include such special surfaces as one face
23、, except that the edges and corners of the product shall not be used. Dry and condition specimens prior to testing, following applicable specifications for the product. If the material is adversely affected by oven temperatures, then condition the specimens for not less then at and relative humidity
24、 before testing. In the absence of definite drying temperatures, dry the specimens in an oven at to constant mass, and hold in a desicator to cool to room temperature before testing. Where circumstances or requirements preclude compliance with these conditioning procedures, exceptions agreed upon by
25、 the purchaser and the manufacturer may be made, but they shall be specifically listed in the test report. 6 Procedure Condition the test specimens and oak cubes at and R.H. for a minimum of (it will not be necessary to condition the specimens for a further if they have already been conditioned for
26、under these conditions see clause 5). Conduct the test in the standard laboratory atmosphere of and relative humidity. Weigh a set of twelve conditioned test specimens on a balance to within . Place the twelve specimens together with the 24 oak cubes in the clean test box and secure the lid tightly.
27、 Rotate the box at ( ) revolutions per minute for ( ) revolutions. Immediately after the test period, carefully empty the contents of the box onto a mesh screen and tap gently to remove dust and small particles. Carefully remove the specimens from the screen and weigh promptly. Make three tests. Use
28、 a new set of test specimens for each test. 7 Calculation Calculate the percent mass loss for each set of specimens using the following equation: where is the original mass of the test specimens; (19 0,8) mm 650 kg=m 3 1,6 mm (25 1,5) mm 40 h (23 2) C (50 5) % (70 2) C (23 2) C (50 5)%6 h 6 h 40 h (
29、23 2) C (50 5) % 1% 60 2 600 3 9,5 mm % mass loss = m 1 m 2 m 1 100 m 1ISO 6187:2001(E) ISO 2001 All rights reserved 3 is the final mass of the specimens. Calculate the average percent mass loss for the three sets of specimens, expressing the result to two significant figures. 8 Precision and bias P
30、recision The precision of this test method is given in Table 1. Repeatability The difference between successive results obtained by the same operator with the same apparatus under constant operating conditions on identical test materials would exceed the values given for repeatability in Table 1 onl
31、y in one case in twenty. Reproducibility The difference between two single and independent results obtained by different operators working in different laboratories on identical material would exceed the values given for reproducibility in Table 1 only inon eca seintw e n ty . Bias No information ca
32、n be presented on the bias of the procedure in this test method because no material having an accepted reference value is available. 9 Test report The test report shall include the following: a) a reference to this International Standard; b) a complete description of the material tested, including t
33、ype, source and density determined in accordance with ISO 845, and special surfaces if any; c) the conditioning and drying procedures followed, and any special conditions employed in the test; d) the percent mass loss; e) any comments on the mode and extent of abrasion, erosion, crumbling, cracking,
34、 etc.; f) the date of the test. Table 1 Precision Material Mass loss Repeatability Reproducibility (cellular plastic) A 0,11 0,34 310 0,40 360 B 1,0 0,65 65 0,83 83 C 5 , 31 , 63 14 , 27 9 D 31 2,6 8,2 8,5 27 E4 94 , 59 , 11 12 3 F 50 5,3 11 11 22 is the repeatability standard deviation. is the repr
35、oducibility standard deviation. NOTE 1 The materials listed in this table include nominally expanded polystyrene, nominally extruded polystyrene, nominally polyurethane foam, nominal polyisocyanurate foam and commercial phenolic foam. The results are for materials used in the round- robin test only,
36、 which may not be commercially available. These materials were selected to provide a proper range of results, not to characterize the materials. NOTE 2 Six laboratories participated. Each laboratory carried our three tests. m 2 % 2s r 2s r 2s R 2s R % s r s R 16 kg/m 3 32 kg/m 3 32 kg/m 3 32 kg/m 3ISO 6187:2001(E) 4 ISO 2001 All rights reserved Bibliography 1 ASTM Research Report C16-1006, available from ASTM, 100 Barr Harbor Dr, West Conshohocken, PA 19428, USA. 2 ISO 472:1999, Plastics Vocabulary.ISO 6187:2001(E) ICS 83.100 Price based on 4 pages ISO 2001 All rights reserved
