1、October 2012 Translation by DIN-Sprachendienst.English price group 12No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 83.060!$wA“1918430www.din.deDDIN ISO 23529Rubber General procedures for preparing and conditioning test pieces forphysical test methods (ISO 23529:2010),English translation of DIN ISO 23529:2012-10Elastomere Allgemeine Bedingungen fr die Vorbereitung und Konditionierung von Prfkrpern frphysikalisc
3、he Prfverfahren (ISO 23529:2010),Englische bersetzung von DIN ISO 23529:2012-10Caoutchouc Procdures gnrales pour la prparation et le conditionnement des prouvettes pour lesmthodes dessais physiques (ISO 23529:2010),Traduction anglaise de DIN ISO 23529:2012-10SupersedesDIN ISO 23529:2007-01www.beuth.
4、deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.2009.12 A comma is used as the decimal marker. Contents Page National foreword .3 National Annex NA (informative) Bibliography 4 1 Scope 5 2 Identification and record keeping 5 3 Standard labor
5、atory conditions .6 3.1 Standard laboratory temperature .6 3.2 Standard laboratory humidity .6 3.3 Other conditions 6 4 Storage of samples and test pieces 6 5 Preparation of test pieces .7 5.1 Test piece thickness 7 5.2 Thickness adjustment .7 5.3 Test piece cutters 9 5.4 Maintenance of cutters . 10
6、 5.5 Preparation of test pieces by moulding . 10 6 Conditioning 11 6.1 General . 11 6.2 Conditioning times for subnormal or elevated temperatures 11 7 Measurement of the dimensions of test pieces 11 7.1 Method A For dimensions less than 30 mm 11 7.2 Method B For dimensions of 30 mm and up to and inc
7、luding 100 mm 12 7.3 Method C For dimensions over 100 mm 12 7.4 Method D Non-contact method . 12 8 Conditions of test . 13 8.1 Duration of test . 13 8.2 Temperature and humidity . 13 9 Test chambers 14 9.1 General requirements for temperature-controlled chambers 14 9.2 Chambers operating at elevated
8、 temperatures . 15 9.3 Chambers operating at subnormal temperatures . 15 10 Test report . 16 Annex A (normative) Conditioning times for rubber test pieces 17 Bibliography . 20 2 DIN ISO 23539:2012-10 National foreword This standard has been prepared by Technical Committee ISO/TC 45 “Rubber and rubbe
9、r products”, Subcommittee SC 2 “Testing and analysis” (Secretariat: JISC, Japan). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Working Committee NA 062-04-34 AA Prfung der physikalischen Eigenschaften von Kaut
10、schuk und Elastomeren. The following should be taken into consideration: Re Subclause 5.2: Since the surface of foam rubber test pieces is damaged after splitting or cutting, testing should be carried out on pieces having the original thickness. Re Subclause 7.1: A digital dial gauge having a resolu
11、tion of 0,001 mm should be used for this method. Thus the gauge will certainly be capable of measuring thickness with the required accuracy. The requirement that the foot is not to extend over the edge of the test piece need not be met if it is possible to adjust the specified measuring pressure to
12、the dimensions of the test piece. The test piece should lay flat on the baseplate throughout the entire measuring procedure. Re Subclause 7.2: A digital calliper having a resolution of 0,01 mm should be used. The error of measurement should be no greater than 0,1 %. Re Subclause 7.3: The error of me
13、asurement should be no greater than 0,5 % or 1 mm, whichever is the smaller. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 525 DIN ISO 525 ISO 3302-1 DIN ISO 3302-1 Attention is drawn to the possibility that some of the elements of th
14、is document may be the subject of patent rights. DIN shall not be held responsible for identifying any or all such patent rights. Amendments This standard differs from DIN ISO 23529:2007-01 as follows: a) a warning note relating to the safe handling of hazardous substances or waste has been included
15、; b) the standard has been editorially revised. Previous editions DIN 53502: 1956-04, 1959-11, 1972-08 DIN 53500: 1979-03, 1989-09 DIN 53534: 1984-02, 1994-05, 2000-04 DIN ISO 471: 1998-02 DIN ISO 4666-1: 1992-01, 1995-08 DIN ISO 23529: 2007-01 3 DIN ISO 23539:2012-10 National Annex NA (informative)
16、 Bibliography DIN ISO 525, Bonded abrasive products General requirements DIN ISO 3302-1, Rubber Tolerances for products Part 1: Dimensional tolerances 4 DIN ISO 23539:2012-10 Rubber General procedures for preparing and conditioning test pieces for physical test methods WARNING Persons using this Int
17、ernational Standard should be familiar with normal laboratory practice. This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any n
18、ational regulatory conditions. CAUTION Certain procedures specified in this International Standard can involve the use or generation of substances, or the generation of waste, that could constitute a local environmental hazard. Reference should be made to appropriate documentation on safe handling a
19、nd disposal after use. 1 Scope This International Standard specifies general procedures for the preparation, measurement, marking, storage, and conditioning of rubber test pieces for use in physical tests specified in other International Standards, and the preferred conditions to be used during the
20、tests. Special conditions, applicable to a particular test or material or simulating a particular climatic environment, are not included, nor are special requirements for testing whole products. This International Standard also specifies the requirements for the time interval to be observed between
21、forming and testing of rubber test pieces and products. Such requirements are necessary to obtain reproducible test results and to minimize disagreements between customer and supplier. 2 Identification and record keeping Records shall be kept of the identity of each test piece so that it is identifi
22、able with the sample supplied and such that all the relevant details of preparation, storage, conditioning and measurement are traceable to each individual test piece. Each sample or test piece shall be individually identifiable by marking or segregation at each stage of its preparation and testing.
23、 Where marking is used as the method of identification, the markings shall be sufficiently durable to ensure that the test piece or sample remains identifiable until discarded. Where grain effects can be significant, the direction of the grain shall be identified on each sample or test piece. The me
24、thod of marking shall not affect the properties of the sample or test piece and shall avoid significant surfaces, i.e. surfaces which are to be directly tested (e.g. in abrasion tests) or surfaces at which fracture terminates the test (e.g. tear or tensile tests). 5 DIN ISO 23539:2012-10 3 Standard
25、laboratory conditions 3.1 Standard laboratory temperature The standard laboratory temperature shall be either (23 2) C or (27 2) C in accordance with national practice. If a closer tolerance is required, it shall be 1 C. NOTE The temperature 23 C is normally the standard laboratory temperature in te
26、mperate countries and 27 C is normally the standard laboratory temperature in tropical and subtropical countries. 3.2 Standard laboratory humidity If control of both temperature and humidity is necessary, they shall be selected from Table 1. Table 1 Preferred relative humidity Temperature C Relative
27、 humidity % Tolerance on humidity % 23 50 27 65 10aaIf a tighter tolerance is needed, 5 % can be specified. 3.3 Other conditions When control of temperature and humidity is not necessary, the prevailing ambient temperature and humidity can be used. The latter conditions shall be used where standard
28、laboratory conditions cannot easily be achieved. 4 Storage of samples and test pieces 4.1 Samples awaiting the preparation of test pieces and test pieces prior to conditioning shall be stored under conditions which minimize the possibility of degradation by ambient conditions, such as heat or light,
29、 or for contamination, e.g. cross-contamination from other samples. 4.2 For all tests, the minimum time between forming the material and testing shall be 16 h. When test pieces are cut from a product or where a whole product, e.g. bridge bearings, is tested, considerably more time than 16 h between
30、forming the material and testing can be necessary. In these cases, the minimum time shall be as given in the product specification or relevant test method. 4.3 For non-product tests, the maximum time between forming the material and testing shall be 4 weeks and, for evaluations intended to be compar
31、able, the tests shall be carried out, as far as possible, after the same time interval. 4.4 For product tests, whenever possible, the time between forming the product and testing shall not exceed 3 months. In other cases, tests shall be made within 2 months of the date of receipt of the product by t
32、he customer. 4.5 These requirements relate only to initial rubber material tests and to product tests at both the initial and delivery stage. Special tests for other purposes can be carried out at any time, e.g. for the purposes of process control or to evaluate the influence of abnormal storage con
33、ditions on a product. Such reasons shall be clearly stated in the test report. 6 DIN ISO 23539:2012-10 4.6 In the case of unvulcanized compound, batches shall be conditioned for between 2 h and 24 h at one of the standard laboratory temperatures specified in 3.1, preferably in a closed container to
34、prevent absorption of moisture from the air, or in a room in which the relative humidity is controlled at (50 5) %. 5 Preparation of test pieces 5.1 Test piece thickness The test piece thickness shall be as specified in the relevant test method. However, it is recommended that the test piece thickne
35、sses given in Table 2 be used for specially moulded test sheets for all tests unless, for technical reasons, other thicknesses are necessary. Table 2 Preferred test piece thicknesses Test piece thicknessmm Tolerance mm 1 0,1 2 0,2 4 0,2 6,3 0,3 12,5 0,5 5.2 Thickness adjustment 5.2.1 General When ma
36、terial, particularly from products, requires testing, but is not available in a thickness recommended in Table 2, procedures are required to adjust the thickness to within the prescribed limits. Recommended procedures are given in 5.2.2. In most cases, thickness adjustments shall be made on the mate
37、rial before the cutting of the test pieces. For most rubbers, splitting or buffing modifies the surface. Hence, when a surface-dependent property is being measured, thicknesses other than those in Table 2 might need to be specified in order to retain the original surface. 5.2.2 Techniques 5.2.2.1 Re
38、moval of textiles combined with the rubber The separation shall preferably avoid the use of a liquid, which causes swelling. If this is not possible, a nontoxic liquid of low boiling point, such as isooctane (2,2,4-trimethylpentane), can be used to wet the contacting surfaces. Care shall be taken to
39、 avoid excessive stretching of the rubber by separating a little at a time while the rubber is gripped near the point of separation. If a liquid is used, the rubber shall be placed so as to permit free evaporation of the liquid, and time shall be allowed for the complete evaporation of the liquid, p
40、referably at least 16 h, before the test pieces are cut and tested. 5.2.2.2 Cutting techniques When it is necessary to remove a considerable thickness of rubber or to produce a number of slices from a thick piece of rubber, cutting equipment such as that specified in 5.2.3.1 and 5.2.3.2 shall be use
41、d. 7 DIN ISO 23539:2012-10 5.2.2.3 Abrading techniques When it is necessary to remove surface unevenness, such as fabric impressions or corrugations caused by contact with fabric components or with cloth wrappings used for vulcanization, or unevenness caused by cutting, this shall be done using the
42、equipment specified in 5.2.3.3 or 5.2.3.4. 5.2.3 Equipment for test piece preparation 5.2.3.1 Rotating-blade equipment This equipment is based on commercial slicing machines. The machine consists of a motor- or hand-driven disc cutter of suitable diameter with a movable cutting table which transport
43、s the sample to the cutting edge. An adjustable slow-feed mechanism fitted to the cutting table feeds the rubber forward to the line of cut, and controls the thickness of the slice. Clamping devices shall be available to secure the rubber. The blade shall preferably be lubricated with a dilute aqueo
44、us detergent solution to ease the cutting operation. 5.2.3.2 Skiving machines This equipment is based on commercial leather-slitting machinery, and convenient types are available for cutting strips about 50 mm wide with thicknesses up to about 12 mm. Adjustment shall be possible to vary the thicknes
45、s of cut, and feed rollers shall be provided to transport the material past the knife. Provision shall be made for maintaining the cutting edge in a sharp condition. Attachments are available for splitting and cutting sections from cable sheathing. 5.2.3.3 Abrasive wheels The abrading apparatus shal
46、l consist of an abrader with a motor-driven abrasive wheel. It is important that the wheel runs true without vibration, and that the abrasive surface, of aluminium oxide or silicon carbide, is true and sharp. The abrader can be equipped with a slow-feed mechanism so that very light cuts can be made
47、to avoid overheating of the rubber. Suitable means shall be provided for securing the rubber to prevent excessive deformation and for controlled traversing of the rubber against the abrasive wheel. NOTE Wheels of diameter 150 mm operating at a surface speed in the range 10 m/s to 12 m/s, designated
48、C-30-P-4-V for roughing and designated C-60-P-4-V for finishing (see ISO 5251), have been found suitable. The depth of cut produced in the first pass shall not exceed 0,2 mm. Successive cuts shall be progressively less deep to avoid overheating. Buffing shall not be carried out beyond the point where unevenness in the thickness has been eliminated. For removal of greater thicknesses of rubber, cutting equipment as specified in 5.2.3.1 or 5.2.3.2 shall be used. 5.2.3.4 Flexible abrasive belts The apparatus sh
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