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1、BRITISH STANDARD BS ISO 20753:2008 Plastics Test specimens ICS 83.080.01 ? Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:23:51 MDTNo reproduction or networking permitted without license f
2、rom IHS -,-,- BS ISO 20753:2008 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2008 BSI 2008 ISBN 978 0 580 55316 5 National foreword This British Standard is the UK implementation of ISO 20753:2008. The UK participation in its prep
3、aration was entrusted to Technical Committee PRI/21, Testing of plastics. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct
4、application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication DateComments Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale,
5、08/14/2008 22:23:51 MDTNo reproduction or networking permitted without license from IHS -,-,- Reference number ISO 20753:2008(E) INTERNATIONAL STANDARD ISO 20753 First edition 2008-03-15 Plastics Test specimens Plastiques prouvettes BS ISO 20753:2008 Copyright British Standards Institution Provided
6、by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:23:51 MDTNo reproduction or networking permitted without license from IHS -,-,- ii Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee
7、=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:23:51 MDTNo reproduction or networking permitted without license from IHS -,-,- iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references. 2 3 Terms and definitions. 2 4 Preparation of test specimens 3 4.1 General. 3 4.2 Injec
8、tion moulding of test specimens 3 4.3 Compression moulding of test specimens 4 4.4 Preparation of test specimens by machining 4 5 Types of test specimen and their dimensions. 4 5.1 Types of test specimen 4 5.2 Tensile test specimens with parallel-sided central section . 5 5.2.1 Multipurpose test spe
9、cimens (type A1 and type A2) 5 5.2.2 Reduced-scale test specimens . 6 5.3 Bar test specimens (type B) 7 5.4 Small tensile specimens (type C) 8 5.5 Plate specimens (type D) . 9 6 Report on preparation of test specimens. 9 Annex A (informative) Recommended applications for multipurpose test specimens
10、or parts thereof 11 Annex B (normative) Designation system for test specimens 12 Bibliography. 14 BS ISO 20753:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:23:51 MDTNo reproduction
11、or networking permitted without license from IHS -,-,- iv Foreword 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 committe
12、es. 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, in liaison with ISO, also take part in the work. ISO collaborates closely with the Inte
13、rnational 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 S
14、tandards 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 su
15、bject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 20753 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical properties. BS ISO 20753:2008 Copyright British Standards Institution Provided by IHS under licens
16、e with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:23:51 MDTNo reproduction or networking permitted without license from IHS -,-,- v Introduction Up to now, information on plastics test specimens has been specified in several different locations: in test metho
17、d standards (e.g. ISO 527-2), in ISO 3167 (for multipurpose test specimens) and in ISO 294-1, ISO 294-2, ISO 294-3 and ISO 294-5 (for moulding conditions). The aim of this International Standard is to give the designations and dimensions of test specimens used for the acquisition of comparable data,
18、 and also other frequently used specimens, in one document for ease of reference. This will be followed by a revision of the ISO 294 series, which will define only the injection-moulding conditions and will refer to this International Standard for the dimensions of the specimens. Other International
19、 Standards that have hitherto used different designations for the same specimen type will also be revised to bring the designations into line with those in this International Standard. BS ISO 20753:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Cop
20、y Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:23:51 MDTNo reproduction or networking permitted without license from IHS -,-,- blank Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2
21、008 22:23:51 MDTNo reproduction or networking permitted without license from IHS -,-,- 1 Plastics Test specimens 1 Scope 1.1 This International Standard specifies dimensional requirements relating to test specimens prepared from plastics materials intended for processing by moulding, as well as to t
22、est specimens prepared by machining from sheets or shaped articles. It gives, in one document, the designations and dimensions of test specimens used for the acquisition of comparable data and also other frequently used specimens. The following types of test specimen are specified: a) Type A1 and ty
23、pe A2 specimens (1 = injection moulded, 2 = machined from a sheet or shaped article) These are tensile test specimens from which, with simple machining, specimens for a variety of other tests can be taken (see Annex A). The type A1 specimen corresponds to the ISO 3167:2002 type A multipurpose test s
24、pecimen. The principal advantage of a multipurpose test specimen is that it allows all the test methods mentioned in Annex A to be carried out by all test laboratories on the basis of comparable mouldings. Consequently, the properties measured are coherent as all are measured using similar specimens
25、 prepared in the same way. In other words, it can be expected that test results for a given set of specimens will not vary appreciably due to unintentionally different moulding conditions. On the other hand, if desired, the influence of moulding conditions and/or different states of the specimens ca
26、n be assessed without difficulty for all of the properties measured. Also described are reduced-scale test specimens designated type Axy, where x is the number indicating the method of specimen preparation (1 = injection moulded, 2 = machined from a sheet or shaped article) and y is a number indicat
27、ing the scale factor (1:y). These can be used e.g. when full-sized test specimens are not convenient or when sample material exists in small quantities only. b) Type B specimens These are bar specimens which can be directly moulded or can be machined from the central section of type A1 specimens or
28、from sheets or shaped articles. c) Type C specimens These are small tensile test specimens which can be directly moulded or machined, e.g. from plates (Type D specimens), from the central section of type A1 specimens or from sheets or shaped articles. d) Type D1 and type D2 specimens These are squar
29、e plates of thickness 1 mm and 2 mm, respectively. If a particular type of test specimen is not mentioned in this International Standard, this does not mean that there is any intention to exclude the use of the specimen. Additional specimen types may be added in future if they are commonly used. BS
30、ISO 20753:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:23:51 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 2 Normative references The following referen
31、ced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 293, Plastics Compression moulding of test specimens of thermoplas
32、tic materials ISO 294-1, Plastics Injection moulding of test specimens of thermoplastic materials Part 1: General principles, and moulding of multipurpose and bar test specimens ISO 295, Plastics Compression moulding of test specimens of thermosetting materials ISO 2818, Plastics Preparation of test
33、 specimens by machining ISO 10350-1, Plastics Acquisition and presentation of comparable single-point data Part 1: Moulding materials ISO 10350-2, Plastics Acquisition and presentation of comparable single-point data Part 2: Long-fibre- reinforced plastics ISO 10724-1, Plastics Injection moulding of
34、 test specimens of thermosetting powder moulding compounds (PMCs) Part 1: General principles and moulding of multipurpose test specimens ISO 11403-1, Plastics Acquisition and presentation of comparable multipoint data Part 1: Mechanical properties ISO 11403-2, Plastics Acquisition and presentation o
35、f comparable multipoint data Part 2: Thermal and processing properties ISO 11403-3, Plastics Acquisition and presentation of comparable multipoint data Part 3: Environmental influences on properties 3 Terms and definitions For the purposes of this document, the following terms and definitions apply.
36、 3.1 multipurpose test specimen type A1 or type A2 tensile test specimen as shown in Figure 1 and specified in Table 1 and Table 2, respectively NOTE 1 Although ISO 3167:2002 refers to both the type A and type B specimens, defined in that International Standard, as multipurpose test specimens, for t
37、he purposes of this International Standard it is the type A1 specimen which is the preferred specimen for the acquisition of comparable data and hence the true multipurpose test specimen. NOTE 2 The type A1 specimen can be made suitable for a variety of tests by simple cutting, because the length l1
38、 of the narrow parallel-sided section is 80 mm 2 mm. 3.2 l1 length of the narrow parallel-sided section (central section) of the type A and type CP tensile test specimens, the length of the type B bar specimen and the length of the side of the type D plate specimen 3.3 l2 distance between the broad
39、parallel-sided sections (tabs) of the type A and type CP tensile test specimens BS ISO 20753:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:23:51 MDTNo reproduction or networking perm
40、itted without license from IHS -,-,- 3 3.4 l3 overall length of the type A and type C tensile test specimens 3.5 b1 width of the narrow parallel-sided section (central section) of the type A tensile test specimen, the minimum width of the type C test specimen and the length of the side of the type D
41、 plate specimen 3.6 b2 width of the broad parallel-sided sections (tabs) of the type A and type C tensile test specimens 3.7 r radius of the shoulder region of the type A and type C tensile test specimens 3.8 h thickness of the test specimen 4 Preparation of test specimens 4.1 General Test specimens
42、 shall be prepared in accordance with the relevant material specification. When none exists, specimens shall be either directly compression or injection moulded from the material in accordance with ISO 293, ISO 294-1, ISO 295 or ISO 10724-1, as appropriate, or machined in accordance with ISO 2818 fr
43、om sheets that have been compression or injection moulded from the compound, extruded from the compound or polymerized and cast. Strict control of all the specimen preparation conditions is essential to ensure that all test specimens in a set are in the same state. All surfaces of the test specimens
44、 shall be free from visible flaws, scratches or other imperfections. With moulded specimens, any flash present shall be completely removed, taking care not to damage the moulded surface. The broad sides of multipurpose test specimens shall be suitably marked (see Note), for injection-moulded specime
45、ns to distinguish between the sides formed by the cavity plate and the fixed plate of the mould (see ISO 294-1 or ISO 10724-1), for compression-moulded and machined specimens to identify any asymmetry resulting from the underlying moulding process. For injection-moulded specimens, the sides can be i
46、dentified by the impressions of the ejection pins and by the draft angle. Compression-moulded and machined specimens shall be marked at their shoulders. ISO bars taken from the central section of multipurpose test specimens shall be marked outside their central 64 mm section, which is loaded during
47、flexural testing. NOTE Asymmetry with respect to thickness may influence the flexural properties, including the temperature of deflection under load (see Annex A). 4.2 Injection moulding of test specimens Test specimens shall be injection moulded as specified in ISO 294-1 or ISO 10724-1, as appropri
48、ate, and under the conditions defined in the relevant International Standard for the material under examination or, if no such standard exists, as recommended by the manufacturer of the material or as agreed upon between the interested parties. BS ISO 20753:2008 Copyright British Standards Institution Provided by IHS under license