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1、BRITISH STANDARD BS EN ISO 75-3:1996 BS 2782-1: Method 121D: 1994 ISO 75-3:1993 Incorporating Amendment No. 1Plastics Determination of temperature of deflection under load Part 3: High-strength thermosetting laminates and long-fibre-reinforced plastics The European Standard EN ISO 75-3:1996 has the
2、status of a British Standard IMPORTANT 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 75-3:1996 This British Standard,
3、having been prepared under the direction of the Plastics and Rubber Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 January 1994 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference PRM/21 D
4、raft for comment 91/46559 DC ISBN 0 580 22694 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/21, upon which the following bodies were represented: Assoc
5、iation of Consulting Scientists British Plastics Federation British Textile Confederation Department of the Environment (Building Research Establishment) Department of Trade and Industry (National Physical Laboratory) Electrical and Electronic Insulation Association (BEAMA Ltd.) GAMBICA (BEAMA Ltd.)
6、 Institute of Materials Ministry of Defence Packaging and Industrial Films Association Pira International RAPRA Technology Ltd. The following body was also represented in the drafting of the standard, through subcommittees and panels: Malaysian Rubber Producers Research Association Amendments issued
7、 since publication Amd. No.DateComments 8645July 1996Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 75-3:1996 BSI 08-1999i Contents Page Committees responsibleInside front cover National forew
8、ordii Foreword2 Text of EN ISO 75-33 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 75-3:1996 ii BSI 08-1999 National foreword This British Standard has been prepared by Technical Committee PRI/
9、21 and is the English language version of EN ISO 75-3:1996 Plastics Determination of temperature deflection under load Part 3: High-strength thermosetting laminates and long-fibre-reinforced plastics published by the European Committee for Standardization (CEN). It is identical with ISO 75-3:1993 pu
10、blished by the International Organization for Standardization (ISO). It supersedes BS 2782:Method 121C:1992, which is withdrawn. WARNING. This British Standard, which is identical with ISO 75-3:1993, does not necessarily detail all the precautions necessary to meet the requirements of the Health and
11、 Safety at Work etc. Act 1974. Attention should be paid to any appropriate safety precautions and the method should be operated only by trained personnel. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their c
12、orrect 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 75-1:1993Part 1: Thermal properties Method 121:1994 General test method for
13、determination of temperature of deflection under load of plastics (Identical) ISO 178:1993Part 3: Mechanical properties Method 335A:1993 Determination of flexural properties (Identical) Part 9: Sampling and test specimen preparation ISO 295:1991Method 902A:1992 Plastics Compression moulding of test
14、specimens of thermosetting 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 2818:1974 has been superseded by ISO 2818:1980, which was not adop
15、ted 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, the EN ISO title page, pages 2 to 4, an inside back cover an
16、d 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 02:09:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN S
17、TANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 75-3 February 1996 ICS 83.080 Descriptors: See ISO document English version Plastics Determination of temperature of deflection under load Part 3: High-strength thermosetting laminates and long-fibre-reinforced plastics (ISO 75-3:1993) Plastiques Dtermi
18、nation de la temprature de flchissement sous charge Partie 3: Stratifis thermodurcissables haute rsistance et plastiques renforcs de fibres longues (ISO 75-3:1993) Kunststoffe Bestimmung der Wrmeformbestndigkeitstemperatur Teil 3: Hochfeste duroplastische laminate und langfaserverstrkte Kunststoffe
19、(ISO 75-3:1993) This European Standard was approved by CEN on 1994-12-14. CEN members are bound to comply 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 bibliogr
20、aphical references concerning such national standards may be obtained on application to the Central Secretariat 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
21、CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spa
22、in, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen 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 75-3:1996 E Licensed Copy: sheffieldun
23、sheffieldun, na, Mon Nov 20 02:09:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 75-3:1996 2 BSI 08-1999 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 S
24、tandard by Technical Committee CEN/TC 249, Plastics, the secretariat of which is held by IBN. This European 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
25、be withdrawn at the latest by August 1996. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembour
26、g, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4Principle3 5Apparatus3 6Test specimens3 7Conditioning4 8Procedure4 9Expression of results4 10Precision4 11Test report4 Licensed Copy: sheffieldun
27、 sheffieldun, na, Mon Nov 20 02:09:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 75-3:1996 BSI 08-19993 1 Scope 1.1 This part of ISO 75 specifies a method for the determination of the temperature of deflection under load (bending stress) of high-strength thermosetting laminates and compressio
28、n-moulded long-fibre-reinforced plastics. The test load used is not a fixed load, as in part 2 of this International Standard, but a function (1/10) of the ultimate or specified load. This allows the method to be applied to materials with a wide range of strengths and bending moduli. 1.2 The test sp
29、ecimen is tested in a flatwise position. 1.3 See ISO 75:1993, subclause 1.3. 2 Normative references The following standards contain provisions 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 stand
30、ards are subject to revision, and parties to agreements based on this part of ISO 75 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 75-1:199
31、3, Plastics Determination of temperature of deflection under load Part 1: General test method. ISO 178:1993, Plastics Determination of flexural properties. ISO 295:1991, Plastics Compression moulding of test specimens of thermosetting materials. ISO 2818:, Plastics Preparation of test specimens by m
32、achining1). ISO 3167:1993, Plastics Multipurpose test specimens. 3 Definitions See ISO 75-1:1993, clause 3. 4 Principle A standard test specimen made of thermosetting laminate or long-fibre-reinforced plastic is subjected to a bending stress equal to 1/10 of a specified or measured flexural strength
33、. The temperature is raised at a uniform rate, and the temperature at which a specified deflection occurs is measured. NOTE 1It is recommended that, to facilitate comparison between materials, whenever this property is stated in product literature the test stress should also be given. 5 Apparatus 5.
34、1 Means of applying a bending stress See ISO 75-1:1993, subclause 5.1. If apparatus in which the distance between the test-specimen supports can be varied is used, this distance shall be variable from 60 mm to 210 mm. 5.2 Heating equipment See ISO 75-1:1993, subclause 5.2. 5.3 Weights See ISO 75-1:1
35、993, 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 The test specimen shall have the following dimensions: The test specimen shall be produce
36、d in accordance with ISO 295 (and ISO 2818, if applicable), or as agreed upon by the interested parties. In the case of compression-moulded test specimens, the width shall be perpendicular to the direction of the moulding force. For materials in sheet form, the thickness of the test specimens (this
37、dimension is usually the thickness of the sheet) shall be in the range 2 mm to 7 mm. For samples over 7 mm thick, reduce the thickness to 7 mm by machining one face. If the faces of the test specimen are dissimilar, report the face machined in the test report. 1) To be published. (Revision of ISO 28
38、18:1980) length, l:at least 10 mm longer than the distance chosen for the span between the test-specimen supports width, b:9,8 mm to 12,8 mm thickness, h: 2,0 mm to 7,0 mm Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 75-3:1996 4 BS
39、I 08-1999 In view of the requirement for the distance between the test-specimen supports to be 30 times the test-specimen thickness (see 8.3), the distance between the supports may be anywhere between 60 mm and 210 mm. Some test machines have a fixed span of 100 mm, however, and can therefore only b
40、e used with test specimens up to 3 mm thick. Such a machine may be used but, if the test-specimen thickness is greater than 3 mm, it will have to be reduced by machining. As before, machine only one face and, if the faces are dissimilar, report which face was machined in the test report. NOTE 2Most
41、reinforced thermoset laminates are anisotropic, and machining may significantly alter their properties. Ensure that all cut surfaces are as smooth as possible, and that any unavoidable machining marks are in the lengthwise direction. 6.2 The test results obtained on moulded test specimens depend on
42、the moulding conditions used in their preparation. Moulding conditions shall be in accordance with the standard for the material, or shall be agreed upon by the interested parties. 6.3 Discrepancies in test results due to variations in moulding conditions may be minimized by annealing the test speci
43、mens before testing them. Since different materials require different annealing conditions, annealing procedures shall be employed only if required 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
44、to be applied See ISO 75-1:1993, subclause 8.1. The force applied shall be such as to generate a bending stress equal to 1/10 of the requirement for the flexural strength quoted in the relevant standard for the material. If there is no such requirement, the bending stress shall be 1/10 of the flexur
45、al strength determined in accordance with ISO 178. The dimensions of the test specimen are given in 6.1. The span between the test-specimen supports is given in 8.3. 8.2 Initial temperature of the heating equipment See ISO 75-1:1993, subclause 8.2. 8.3 Measurement See ISO 75-1:1993, subclause 8.3. P
46、lace the test specimen on the supports in the flatwise position. Adjust the span L between the supports to (30 2) times the thickness h of the test specimen. Apply the calculated force (see 8.1) to give the required nominal surface stress. Note the temperature at which the bar reaches the standard d
47、eflection calculated from the test-specimen height (the thickness h as the specimen is in the flatwise position) using the formula where This temperature is the temperature of deflection under load. NOTE 3The standard deflection corresponds to a flexural strain of 0,1 % at the surface of the test sp
48、ecimen. 9 Expression of results See ISO 75-1:1993, clause 9. If the individual results differ by more than 5 C, repeat tests shall be carried out. 10 Precision See ISO 75-1:1993, clause 10. 11 Test report See ISO 75-1:1993, clause 11. In addition, identify l) the face machined, if it was necessary t
49、he reduce the test-specimen thickness by machining. L is the span, in millimetres, between the test-specimen supports; his the thickness, in millimetres, of the test specimen. L210 3 6h - - Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 75-3:1996 BSI 08-1999 List of references See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 75-3:199