1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 75-2:2013Plastics Determination oftemperature of deflectionunder loadPart 2: Plastics and ebonite (ISO 75-2:2013)BS EN ISO 75-2:2013 BRITISH STANDARDNational forewordTh
2、is British Standard is the UK implementation of EN ISO 75-2:2013.It supersedes BS EN ISO 75-2:2004 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/21, Testing of plastics.A list of organizations represented on this committee can beobtained on reques
3、t to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 73628 5ICS 83.060; 83.080.10Compliance with a Brit
4、ish Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2013.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 75-2 April 20
5、13 ICS 83.080.10 Supersedes EN ISO 75-2:2004English Version Plastics - Determination of temperature of deflection under load - Part 2: Plastics and ebonite (ISO 75-2:2013) Plastiques - Dtermination de la temprature de flchissement sous charge - Partie 2: Plastiques et bonite (ISO 75-2:2013) Kunststo
6、ffe - Bestimmung der Wrmeformbestndigkeitstemperatur - Teil 2: Kunststoffe und Hartgummi (ISO 75-2:2013) This European Standard was approved by CEN on 21 March 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Stan
7、dard 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 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (Englis
8、h, 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bu
9、lgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
10、Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No.
11、EN ISO 75-2:2013: EBS EN ISO 75-2:2013EN ISO 75-2:2013 (E) 3 Foreword This document (EN ISO 75-2:2013) has been prepared by Technical Committee ISO/TC 61 “Plastics“ in collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN. This European Standard shall b
12、e given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2013, and conflicting national standards shall be withdrawn at the latest by October 2013. Attention is drawn to the possibility that some of the elements of this documen
13、t may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 75-2:2004. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bou
14、nd to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portuga
15、l, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 75-2:2013 has been approved by CEN as EN ISO 75-2:2013 without any modification. BS EN ISO 75-2:2013ISO 75-2:2013(E) ISO 2013 All rights reserved iiiContents PageForeword ivI
16、ntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 24 Principle 25 Apparatus . 25.1 Means of producing a flexural stress . 25.2 Heating equipment 25.3 Weights 25.4 Temperature-measuring instrument . 25.5 Deflection-measuring instrument 26 Test specimens 26.1 General . 26.2 Sha
17、pe and dimensions 26.3 Specimen inspection 36.4 Number of test specimens . 36.5 Test-specimen preparation 36.6 Annealing . 37 Conditioning 38 Procedure. 38.1 Calculation of force to be applied 38.2 Initial temperature of the heating equipment . 38.3 Measurement 39 Expression of results 410 Precision
18、 . 411 Test report . 4Annex A (informative) Precision . 5Bibliography 9BS EN ISO 75-2:2013ISO 75-2:2013(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is norm
19、ally carried out through ISO technical committees. 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 t
20、he work. ISO collaborates closely with the International 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 I
21、nternational Standards. Draft International Standards 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
22、 the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 75-2 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical properties.This third edition cancels and replaces the s
23、econd edition (ISO 75-2:2004), which has been technically revised. In particular, Clause 5 and Annex A have been updated.ISO 75 consists of the following parts, under the general title Plastics Determination of temperature of deflection under load: Part 1: General test method Part 2: Plastics and eb
24、onite Part 3: High-strength thermosetting laminates and long-fibre-reinforced plasticsiv ISO 2013 All rights reservedBS EN ISO 75-2:2013ISO 75-2:2013(E)IntroductionThe first editions of ISO 75-1 and this part of ISO 75 described three methods (A, B and C) using different test loads and two specimen
25、positions, edgewise and flatwise. For testing in the flatwise position, test specimens with dimensions 80 mm 10 mm 4 mm were required. These can be moulded directly or machined from the central section of the multipurpose test specimen (see ISO 20753).The previous (i.e. second) editions of ISO 75-1
26、and this part of ISO 75 specified the flatwise test position as preferred, while still allowing testing in the edgewise position with test conditions given in Annex A until the next revision of ISO 75-1 and this part of ISO 75, as agreed in ISO/TC 61/SC2/WG 5. Therefore, with this revision, the edge
27、wise test position will be removed.Technical development of testing instruments in recent years made instruments based on a fluidized bed or air ovens available. These are especially advantageous for use at temperatures at which the common silicone oil-based heat transfer fluids reach their limit of
28、 thermal stability. The fluidized bed and air oven methods of heat transfer are introduced in ISO 75-1.An additional precision statement covering the new heating methods is introduced in this part of ISO 75. ISO 2013 All rights reserved vBS EN ISO 75-2:2013BS EN ISO 75-2:2013Plastics Determination o
29、f temperature of deflection under load Part 2: Plastics and ebonite1 ScopeThis part of ISO 75 specifies three methods, using different values of constant flexural stress, which can be used for the determination of the temperature of deflection under load of plastics (including filled plastics and fi
30、bre-reinforced plastics in which the fibre length, prior to processing, is up to 7,5 mm) and ebonite: m ethod A, using a flexural stress of 1,80 MPa; m ethod B, using a flexural stress of 0,45 MPa; m ethod C, using a flexural stress of 8,00 MPa.The standard deflection, s, used to determine the tempe
31、rature of deflection under load corresponds to a flexural-strain increase, f, defined in this part of ISO 75. The initial flexural strain due to the loading of the specimen at room temperature is neither specified nor measured in this part of ISO 75. The ratio of this flexural-strain increase to the
32、 initial flexural strain depends on the modulus of elasticity, at room temperature, of the material under test. This method is, therefore, only suitable for comparing the temperatures of deflection of materials with similar room-temperature elastic properties.NOTE 1 The methods give better reproduci
33、bility with amorphous plastics than with semi-crystalline ones. With some materials, it can be necessary to anneal the test specimens to obtain reliable results. Annealing procedures, if used, generally result in an increase in the temperature of deflection under load (see 6.6).NOTE 2 For additional
34、 information, see ISO 75-1:2013, Clause 1.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For undated references, the latest edition of the referenced document (including any amendments) applie
35、s.ISO 75-1, Plastics Determination of temperature of deflection under load Part 1: General test methodISO 293, Plastics Compression moulding of test specimens of thermoplastic materialsISO 294-1, Plastics Injection moulding of test specimens of thermoplastic materials Part 1: General principles, and
36、 moulding of multipurpose and bar test specimensISO 2818, Plastics Preparation of test specimens by machiningISO 10724-1, Plastics Injection moulding of test specimens of thermosetting powder moulding compounds (PMCs) Part 1: General principles and moulding of multipurpose test specimensISO 20753, P
37、lastics Test specimensINTERNATIONAL STANDARD ISO 75-2:2013(E) ISO 2013 All rights reserved 1BS EN ISO 75-2:2013ISO 75-2:2013(E)3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 75-1 apply.NOTE Depending on the selected value of the flexural stress (see
38、Clause 1), the temperature of deflection under load (see definition 3.7 in ISO 75-1:2013)is designated as Tf0,45, Tf1,8 or Tf8,0.4 PrincipleThe principle is specified in ISO 75-1:2013, Clause 4.5 Apparatus5.1 Means of producing a flexural stressThis is specified in ISO 75-1:2013, 5.1.The span (dista
39、nce between the lines of contact between specimen and supports) shall be (64 1) mm for testing.5.2 Heating equipmentThis is specified in ISO 75-1:2013, 5.2.5.3 WeightsThis is specified in ISO 75-1:2013 5.3.5.4 Temperature-measuring instrumentThis is specified in ISO 75-1:2013, 5.4.5.5 Deflection-mea
40、suring instrumentThis is specified in ISO 75-1:2013, 5.5.6 Test specimens6.1 GeneralThis is specified in ISO 75-1:2013, 6.1.6.2 Shape and dimensionsSee ISO 75-1:2013, 6.2.The preferred test-specimen dimensions are:length l: (80 2,0) mm;width b: (10 0,2) mm;thickness h: (4 0,2) mm.2 ISO 2013 All righ
41、ts reservedBS EN ISO 75-2:2013ISO 75-2:2013(E)6.3 Specimen inspectionThis is specified in ISO 75-1:2013, 6.3.6.4 Number of test specimensThis is specified in ISO 75-1:2013, 6.4.6.5 Test-specimen preparationTest specimens shall be produced in accordance with ISO 293 (and ISO 2818, if applicable), or
42、in accordance with ISO 294-1 or ISO 10724-1, or as agreed by the interested parties. The test results obtained on moulded test specimens depend on the moulding conditions used in their preparation. The moulding conditions shall be in accordance with the standard for the material concerned, or as agr
43、eed 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 specimens (this dimension is usually the thickness of the sheet) shall be in the range 3 mm to 13 mm, pref
44、erably between 4 mm and 6 mm.The specimen may be taken from the narrow central part of the multipurpose test specimen specified in ISO 20753 (specimen type A1).6.6 AnnealingDiscrepancies in test results due to variations in moulding conditions may be minimized by annealing the test specimens before
45、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 ConditioningThis is specified in ISO 75-1:2013, Clause 7.8 Procedure8.1 Calculation of force
46、 to be appliedThis is specified in ISO 75-1:2013, 8.1.The flexural stress produced shall be one of the following: 1 ,80 MPa (preferred value), in which case 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 designate
47、d method C.8.2 Initial temperature of the heating equipmentThis is specified in ISO 75-1:2013, 8.2.8.3 MeasurementThis is specified in ISO 75-1:2013, 8.3.Apply the force required to produce one of the flexural stresses specified in 8.1. ISO 2013 All rights reserved 3BS EN ISO 75-2:2013ISO 75-2:2013(
48、E)Calculate the standard deflection, s, by means of Formula (4) in ISO 75-1:2013 using a value of 0,2 % for the flexural-strain increase f.Record the temperature at which the initial deflection of the bar has increased by the standard deflection. This temperature is the temperature of deflection und
49、er load. If the individual results for amorphous plastics or ebonite differ by more than 2 C, or those for semi-crystalline materials by more than 5 C, repeat tests shall be carried out.Table 1 Standard deflections for different test-specimen heights for a 80 mm length 10 mm width specimen testedTest-specimen height (thickness h of specimen) mmStandard deflection mm3,83,94,04,14,20,360,350,340,330,32NOTE The thicknesses in Table 1 reflect the acceptable variation in the test-specimen dimensions (see
