DIN 53508-2000 Testing of rubber - Accelerated ageing《橡胶试验 加速老化》.pdf
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1、DEUTSCHE NORM March 2000 ICs 83.060 Prfung von Kautschuk und Elastomeren - Knstliche Alterung Supersedes October 1993 edition In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker. F
2、oreword This standard has been prepared by Technical Committee Prfung der physikalischen Eigenschaften von Kautschuk und Elastomeren of the Normenausschuss Materialprfung (Materials Testing Standards Com- mitt ee) . The standard is based on IS0 188, from which it differs in the following points: - i
3、t gives a different flow velocity for the oven with forced air circulation; - it recommends testing certain properties using type S 2 dumb-bell test pieces; - it recommends test temperatures and duration; - it includes formulae for calculating standard deviations, the variation coefficient and confi
4、dence interval. Amendments This standard differs from the October 1993 edition in that references have been updated and the standard has been editorially revised. Previo us edit ions DIN DVM 3508 = DIN 53508: 1939-02, 1954-12, 1960-05, 1977-07, 1993-10. 1 Scope The test methods specified in this sta
5、ndard serve to determine the resistance of rubber to deterioration by subjecting test pieces to accelerated ageing (either by heating them in air at atmospheric pressure or in oxygen at an elevated pressure). Various physical properties are measured at standard laboratory temperature before and afte
6、r testing, and the relative or absolute differences are used to estimate the relative service life of the rubber. The methods described in this standard are not suitable for assessing the effects of light or ozone on the deterioration of rubber. Continued on pages 2 to 6. Translation by DIN-Sprachen
7、dienst. In case of doubt, the German-language original should be consulted as the authoritative text. No pari of this translation may be reproduced without the prior permission of V Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany, s the exclusive right of sale f
8、or German Standards (DIN-Normen). Ref. No. DIN 53508 : 2000-0 English price group 06 Sales No. 0106 07.00 Page 2 DIN 53508 : 2000-03 2 Normative references This standard incorporates, by dated or undated reference, provisions from other publications. These norma- tive references are cited at the app
9、ropriate places in the text, and the titles of the publications are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the p
10、ublication referred to applies. DIN 5001 1-2 Testing of materials, components and equipment - Ovens - Conditioning of test pieces DIN 5001 1-1 2 Artificial climates in technical applications - Air temperature as a climatological quantity in controlled-atmosphere test installations DIN 5001 4 Artific
11、ial climates in technical applications - Standard atmospheres DIN 50035-1 Concepts relating to the ageing of materials - Basic concepts DIN 50035-2 Concepts relating to the ageing of materials - Polymer materials DIN 53504 Determination of tensile stresshtrain properties of rubber DIN 53505 Shore A
12、and D hardness testing of rubber and plastics DIN 5351 9-1 Determination of indentation hardness (IRHD) of soft rubber using standard specimens DIN 53598-1 Statistical evaluation of random samples with examples from tests on elastomers and plastics DIN EN IS0 2578 Plastics - Determination of time-te
13、mperature limits after prolonged exposure to heat (IS0 2578 : 1993) IS0 5725-1 : 1994 Accuracy (trueness and precision) of measurement methods and results - Part 1 : General principles and definitions IS0 5725-2 : 1994 Accuracy (trueness and precision) of measurement methods and results - Part 2: Ba
14、sic method for the determination of repeatability and reproducibility of a standard measure- ment method Technische Regeln fr Druckbehalter (TRB) (Codes of practice for pressure vessels) Unfallverhtungsvorschrift Sauerstoff (Accident prevention regulation on the use of oxygen) (VBG 62) Druckbehalter
15、verordnung (German Pressure Vessels Regulation), BGBI. (German Federal Law Gazette) I, 1989, NO. 20, pp. 843-869 3 Concept Accelerated ageing is a test method by means of which the expected deterioration of rubber in practical applications is ascertained by subjecting test pieces to accelerated dete
16、riorating influences (e.g. elevated temperatures, or, in some cases, elevated oxygen pressures). 4 Test methods In order to effectively assess its resistance to ageing, the intended service applications of the rubber should be considered, and test methods and conditions which approximate service con
17、ditions should be selected. Only those properties relevant to application in service shall be determined; in most cases, these will be tensile strength at break, elongation at break, stresshtrain values (see DIN 53504) and hardness (see DIN 53505 or Note that test results, especially those obtained
18、from long-term testing, cannot be compared when different types of ovens (.e. with either forced or natural air circulation) are used. Two methods of accelerated ageing are described in this standard. 4.1 Ageing in air at atmospheric pressure in one of the three following oven types, of which the ov
19、en described in subclause 4.1.1 is to be given preference. 4.1.1 Air oven with forced air circulation (air recirculation system with fresh air supply) (see subclause 6.2). 4.1.2 Air oven with natural air circulation (see subclause 6.3). 4.1.3 Cell-type oven (see subclause 6.4). 4.2 DIN 53519-1). Age
20、ing in oxygen at an elevated pressure (see subclause 6.5). 5 Test pieces Accelerated ageing shall be carried out on test pieces prepared and conditioned as specified in the standards relevant to the appropriate property tests. The number of test pieces shall also be in accordance with these standard
21、s. Page 3 DIN 53508 : 2000-03 Test pieces shall be measured before testing. Only pieces of identical dimensions shall be compared with each other. It is recommended that tests be carried out on type S 2 dumb-bell test pieces which are triple-layered and (2 I0,2) mm thick, as specified in DIN 53504.
22、Marking (e.g. applying gauge lines for measuring elongation) shall be carried out after heating as inks can affect ageing. 6 Apparatus 6.1 General In addition to meeting the requirements listed below, ovens shall be designed so that test pieces do not come in contact with any parts containing copper
23、 or copper alloys, as these materials may accelerate the ageing process. It is essential that the temperature tolerances specified in subclause 7.2 be observed and that temperatures remain constant throughout the oven chamber or cell. Temperatures shall be measured in close proximity to the test pie
24、ce. NOTE: The type of oven to be used will be specified in all relevant test documents. 6.2 Air oven with forced air circulation to DIN 5001 1-12 Ovens with forced air circulation include a recirculation system with fresh air supply. The air shall be preheated to operating temperature, shall circula
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