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1、BRITISH STANDARD BS EN ISO 75-2:1996 BS 2782-1: Method 121A to Method 121C:1994 ISO 75-2:1993 Incorporating Amendment No. 1 Plastics Determination of temperature of deflection under load Part 2: Plastics and ebonite The European Standard EN ISO 75-2:1996 has the status of a British Standard IMPORTAN
2、T NOTE.Before reading this method it is essential to read BS 2782-0 Introduction, issued separately. ICS 83.080 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 75-2:1996 This British Standard, having been prepared under the directi
3、on of the Plastics and Rubber Standard Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 January 1994 BSI 04-1999 First published, as Part of BS 2782:Method 121A to Method 121C, October 1976 Second edition BS 2782-1:Method 121A and Method 12lB Jan
4、uary 1992 Third edition January 1994 The following BSI references relate to the work on this standard: Committee reference PRM/21 Draft for comment 91/46558 DC ISBN 0 580 22690 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics a
5、nd Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/21, upon which the following bodies were represented: Association of Consulting Scientists British Plastics Federation British Textile Confederation Department of the Environment (Building Research Establishment) Department of T
6、rade and Industry (National Physical Laboratory) Electrical and Electronic Insulation Association (BEAMA Ltd.) GAMBICA (BEAMA Ltd.) Institute of Materials Ministry of Defence Packaging and Industrial Films Association Pira International RAPRA Technology Ltd. The following body was also represented i
7、n the drafting of the standard, through subcommittees and panels: Malaysian Rubber Producers Research Association Amendments issued since publication Amd. No.DateComments 8646July 1996Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:05 GMT+00:00 2006
8、, Uncontrolled Copy, (c) BSI BS EN ISO 75-2:1993(E) BSI 04-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN ISO 75-23 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:05 GMT+00:00 2006, Uncontrolled
9、Copy, (c) BSI BS EN ISO 75-2:1996 ii BSI 04-1999 National foreword This British Standard has been prepared by Technical Committee PRI/21 and is the English language version of EN ISO 75-2:1996 Plastics Determination of temperature of deflection under load Part 2: Plastics and ebonite published by th
10、e European Committee for Standardization (CEN). It is identical with ISO 75-2:1993 published by the International Organization for Standardization (ISO). The methods supersede BS 2782:Method 121A and Method 121B:1991, which is withdrawn. Method A, Method B and Method C in the text of the internation
11、al standard are equivalent to Method 121A, Method 121B and Method 121C in BS 2782:1994. WARNING. This British Standard, which is identical with ISO 75-2:1993, does not necessarily detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc. Act 1974. Attention
12、should be paid to any appropriate safety precautions and the method should be operated only by trained personnel. NOTEIn the title to Table 1, line 3, a typographical error occurs as follows: “postion” should be read as “position”. A British Standard does not purport to include all the necessary pro
13、visions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International standardCorresponding British Standard BS 2782 Methods of testing plastics ISO
14、 75-1:1993Part 1. Thermal properties Method 121:1994 General test method for determination of temperature of deflection under load of plastics (Identical) Part 9. Sampling and test specimen preparation ISO 293:1986Method 901A:1988 Compression moulding test specimens of thermoplastic materials (Ident
15、ical) ISO 294:1975Method 910A:1977 Injection moulding test specimens of thermoplastic materials (Identical) ISO 2818:1974aMethod 930A:1977 Preparation of test specimens by machining (Identical) ISO 3167:1993Method 931A:1993 Preparation and use of multipurpose test specimens (Identical) a ISO 2818:19
16、74 has been superseded by ISO 2818:1980, which was not adopted as a British Standard. It is envisaged that a third edition of ISO 2818 which is in preparation will be dual-numbered as a British Standard. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, t
17、he EN ISO title page, pages 2 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:
18、09:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 75-2 February 1996 ICS 83.080 Descriptors: See ISO document English version Plastics Determination of temperature of deflection under load Part 2: Plastics and ebonite (ISO 75-2:1993) Plastiques
19、 Dtermination de la temprature de flchissement sous charge Partie 2: Plastiques et bonite (ISO 75-2:1993) Kunststoffe Bestimmung der Wrmeformbestndigkeitstemperatur Teil 2: Kunststoffe und Hartgummi (ISO 75-2:1993) This European Standard was approved by CEN on 1994-12-14. CEN members are bound to co
20、mply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central S
21、ecretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the o
22、fficial versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen
23、de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN ISO 75-2:1996 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 75-2:1996 BSI
24、04-1999 2 Foreword The text of the International Standard from Technical Committee ISO/TC 61, Plastics, of the International Organization for Standardization (ISO) has been taken over as a European Standard by Technical Committee CEN/TC 249, Plastics, the secretariat of which is held by IBN. This Eu
25、ropean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 1996, and conflicting national standards shall be withdrawn at the latest by August 1996. According to CEN/CENELEC Internal Regulations, the nationa
26、l standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Forewo
27、rd2 1Scope3 2Normative references3 3Definitions3 4Principle3 5Apparatus3 6Test specimens3 7Conditioning4 8Procedure4 9Expression of results4 10Precision5 11Test report5 Table 1 Standard deflection for different test-specimen heights 80 mm 10 mm 4 mm specimen tested in the flatwise postion4 Table 2 S
28、tandard deflection for different test-specimen heights 120 mm (3,0 to 4,2) mm (9,8 to 15,0) mm specimen tested in the edgewise position5 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 75-2:1993(E) BSI 04-19993 1 Scope 1.1 This part of I
29、SO 75 specifies three methods for the determination of the temperature of deflection under load (bending stress) of plastics and ebonite: method A, using a nominal surface stress of 1,80 MPa; method B, using a nominal surface stress of 0,45 MPa; method C, using a nominal surface stress of 8,00 MPa.
30、1.2 The test specimens are tested in one of two positions, flatwise or edgewise, the requirements on test-specimen dimensions being different in each case (see clause 6). 1.3 See ISO 75-1:1993, subclause 1.3. NOTE 1The methods give better reproducibility with amorphous plastics than with semi-crysta
31、lline ones. With some materials, it may be necessary to anneal the test specimens to obtain reliable results. Annealing procedures, if applied, generally result in an increase in the temperature of deflection under load (see 6.2 and 6.3). 2 Normative references The following standards contain provis
32、ions which, through reference in this text, constitute provisions of this part of ISO 75. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 75 are encouraged to investigate the possibility of appl
33、ying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 75-1:1993, Plastics Determination of temperature of deflection under load Part 1: General test method. ISO 293:1986, Plastics Compression moulding
34、 test specimens of thermoplastic materials. ISO 294:1), Plastics Injection moulding of test specimens of thermoplastic materials. ISO 2818:2), Plastics Preparation of test specimens by machining. ISO 3167:1993, Plastics Multipurpose test specimens. 3 Definitions See ISO 75-1:1993, clause 3. 4 Princi
35、ple A standard test specimen made of plastic or ebonite is subjected to a bending stress to produce one of the nominal surface stresses given in 1.1. The temperature is raised at a uniform rate, and the temperature at which a specified deflection occurs is measured. 5 Apparatus 5.1 Means of applying
36、 a bending stress See ISO 75-1:1993, subclause 5.1. The span between the test-specimen supports shall be 64 mm 1 mm if the specimen is tested in the flatwise position and 100 mm 2 mm if the specimen is tested in the edgewise position. 5.2 Heating equipment See ISO 75-1:1993, subclause 5.2. 5.3 Weigh
37、ts See ISO 75-1:1993, subclause 5.3. 5.4 Temperature-measuring instrument See ISO 75-1:1993, subclause 5.4. 5.5 Deflection-measuring instrument See ISO 75-1:1993, subclause 5.5. 6 Test specimens See ISO 75-1:1993, clause 6. 6.1 One of two different types of test specimen shall be used, depending on
38、the orientation of the specimen in the test apparatus. If the specimen is tested in the flatwise position, its dimensions shall be If the specimen is tested in the edgewise position, its dimensions shall be 1) To be published. (Revision of ISO 294:1975) 2) To be published. (Revision of ISO 2818:1980
39、) length, l:80 mm 2,0 mm width, b:10 mm 0,2 mm thickness, h:4 mm 0,2 mm length, l:120,0 mm 10,0 mm width, b:9,8 mm to 15,0 mm thickness, h:3,0 mm to 4,2 mm Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 75-2:1993(E) 4 BSI 04-1999 The te
40、st specimen shall be produced in accordance with ISO 293 and ISO 2818, or ISO 294, or as agreed upon by the interested parties. In the case of compression-moulded specimens, the thickness shall be in the direction of the moulding force. For materials in sheet form, the thickness of the test specimen
41、 (this dimension is usually the thickness of the sheet) shall be in the range 3 mm to 13 mm, preferably between 4 mm and 6 mm. NOTE 2The test results obtained on specimens approaching 13 mm thick may be 2 C to 4 C above those obtained from thin test specimens because of poorer heat transfer. NOTE 3T
42、he possibility of carrying out the test with a smaller (80 mm 10 mm 4 mm) specimen in the flatwise position has been introduced because it gives the following advantages: the specimen can be taken from the narrow central part of the multipurpose test specimen specified in ISO 3167; it is more stable
43、 on the supports; it does not tend to stand on one edge like the edgewise test specimen. 6.2 The test results obtained on moulded test specimens depend on the moulding conditions used in their preparation. Moulding conditions shall be in accordance with the standard for the material, or shall be agr
44、eed upon by the interested parties. 6.3 Discrepancies in test results due to variations in moulding conditions may be minimized by annealing the test specimens before testing them. Since different materials require different annealing conditions, annealing procedures shall be employed only if requir
45、ed by the materials standard or if agreed upon by the interested parties. 7 Conditioning See ISO 75-1:1993, clause 7. 8 Procedure 8.1 Calculation of force to be applied See ISO 75-1:1993, subclause 8.1. The maximum nominal surface stress applied shall be one of the following: 1,80 MPa, in which case
46、 the method is designated method A; 0,45 MPa, in which case the method is designated method B; 8,00 MPa, in which case the method is designated method C. The dimensions of the test specimen are given in 6.1. The span between the test-specimen supports is given in 5.1. 8.2 Initial temperature of the
47、heating equipment See ISO 75-1:1993, subclause 8.2. 8.3 Measurement See ISO 75-1:1993, subclause 8.3. Apply one of the nominal surface stresses specified in 8.1 of this part of ISO 75. Note the temperature at which the bar reaches the standard deflection given in Table 1 or Table 2 for the test-spec
48、imen height concerned (thickness h for specimens tested in the flatwise position and width b for specimens tested in the edgewise position). This temperature is the temperature of deflection under load. NOTE 4The initial flexural strain due to the loading of the specimen at room temperature is neith
49、er specified nor measured in these methods. The specified quantity, the standard deflection s, is essentially a deflection difference, corresponding to a flexural-strain difference. The ratio of this flexural-strain difference to the initial flexural strain depends on the modulus of elasticity, at room temperature, of the material under test. This method is not suitable, therefore, for comparing the temperatures of deflection under load of materials with widely differing elastic propertie