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1、BRITISH STANDARD BS EN ISO 306:2004 Plastics Thermoplastic materials Determination of Vicat softening temperature (VST) The European Standard EN ISO 306:2004 has the status of a British Standard ICS 83.080.20 ? BS EN ISO 306:2004 This British Standard was published under the authority of the Standar
2、ds Policy and Strategy Committee on 5 October 2004 BSI 5 October 2004 ISBN 0 580 44541 0 National foreword This British Standard is the official English language version of EN ISO 306:2004. It is identical with ISO 306:2004. It supersedes BS EN ISO 306:1997 which is withdrawn. The UK participation i
3、n its preparation was entrusted to Technical Committee PRI/21, Testing of plastics, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European pub
4、lications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the n
5、ecessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the i
6、nterpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO t
7、itle page, pages ii to iv, pages 1 to 10, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 306 Jul
8、y 2004 ICS 83.080.20 English version Plastics - Thermoplastic materials - Determination of Vicat softening temperature (VST) (ISO 306:2004) Plastiques - Matires thermoplastiques - Dtermination de la temprature de ramollissement Vicat (VST) (ISO 306:2004) Kunststoffe - Thermoplaste - Bestimmung der V
9、icat- Erweichungstemperatur (VST) (ISO 306:2004) This European Standard was approved by CEN on 7 July 2004. 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 alterat
10、ion. Up-to-date lists and bibliographical 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 translat
11、ion under the responsibility of a 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hung
12、ary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de
13、 Stassart, 36 B-1050 Brussels 2004 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 306:2004: E Foreword This document (EN ISO 306:2004) has been prepared by Technical Committee ISO/TC 61 “Plastics“ in collaborationwith Technical
14、 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 January 2005, and conflicting national standards shall be withdrawn at th
15、e latest by January 2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
16、Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 306:2004 has been approved by CEN as EN ISO 306 2004 without any modifications. EN ISO 306:2004 INTERNATI
17、ONAL STANDARD ISO 306 Fourth edition 2004-07-15 Reference number ISO 306:2004(E) Plastics Thermoplastic materials Determination of Vicat softening temperature (VST) Plastiques Matires thermoplastiques Dtermination de la temprature de ramollissement Vicat (VST) EN ISO 306:2004 ISO :603(4002)E ii id F
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22、 fo teh euqertsre. SIc Oopyrigho tfifce saCsop etela 65 -HCG 1121eneva 02 T.le 22 14 + 10 947 11 Fxa + 22 14 0 94774 9 Eam-il ocpyrithgios.ogr Web wwwi.soo.rg EN ISO 306:2004 iii Contents Page 1Scope 1 2Normative references 1 3Principle 1 4Apparatus . 2 5Test specimens 5 6Conditioning . 6 7Procedure
23、 . 6 8Repeatability 6 9Test report 6 Annex A (informative) Comparison of VST results obtained with heating bath and direct-contact heating unit . 8 Annex B (informative) Repeatability . 10 EN ISO 306:2004 iv Foreword ISO (the International Organization for Standardization) is a worldwide federation
24、of national standards bodies (ISO member bodies). The work of preparing International Standards is normally 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. I
25、nternational organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with
26、 the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approva
27、l 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 subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 306 was prepared by Technical Committee I
28、SO/TC 61, Plastics, Subcommittee SC 2, Mechanical properties. This fourth edition cancels and replaces the third edition (ISO 306:1994), which has been technically revised to address new equipment designs in which the specimen is not heated in a liquid bath but by direct contact with, for instance,
29、a hot metal block. The oven used as one of the possible items of heating equipment in ISO 306:1994 is no longer included. EN ISO 306:2004 ANRETNIITOTS LANDNADRAOSI 3064002:)E( 1 Plastics Thermoplastic materials Determination of Vicat softening temperature (VST) 1Scope 1.1This International Standard
30、specifies four methods for the determination of the Vicat softening temperature (VST) of thermoplastic materials: Method A50 using a force of and a heating rate of Method B50 using a force of and a heating rate of Method A120 using a force of and a heating rate of Method B120 using a force of and a
31、heating rate of . 1.2The methods specified are applicable only to thermoplastics, for which they give a measure of the temperature at which the thermoplastics start to soften rapidly. 2Normative references The following referenced documents are indispensable for the application of this document. For
32、 dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 291, Plastics Standard atmospheres for conditioning and testing ISO 293, Plastics Compression moulding of test specimens of thermoplastic m
33、aterials 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 294-2, Plastics Injection moulding of test specimens of thermoplastic materials Part 2: Small tensile bars ISO 294-3, Plast
34、ics Injection moulding of test specimens of thermoplastic materials Part 3: Small plates ISO 2818, Plastics Preparation of test specimens by machining ISO 3167, Plastics Multipurpose test specimens 3Principle The temperature at which a standard indenting tip with a flat point penetrates into the sur
35、face of a plastic test specimen is determined. The indenting tip exerts a specified force perpendicular to the test specimen, while the specimen is heated at a specified and uniform rate. The temperature, in degrees Celsius, of the specimen, measured as close as possible to the indented area at pene
36、tration, is quoted as the VST. 10 N50 C/h 50 N50 C/h 10 N120 C/h 50 N120 C/h 1 mm 1 mm EN ISO 306:2004 2 4Apparatus The apparatus consists essentially of the following: 4.1Rod, provided with a weight-carrying plate or other suitable load-applying device (see 4.4), held in a rigid metal frame in a li
37、quid-filled bath or direct-contact heating unit so that it can move freely in the vertical direction. In either case, the base of the frame supports the test specimen under the indenting tip at the end of the rod (see Figures 1 and 2). Unless the rod has the same linear thermal expansion coefficient
38、 as the rigid metal frame, the differential change in the length of these parts introduces an error in the indentation readings. A blank test shall therefore be carried out on each rod and frame assembly, using a test specimen made of rigid material having a known, low coefficient of expansion.1) Th
39、e blank test shall cover the temperature range typical of the type of material to be tested. A correction factor shall be determined for at least each change in temperature, for each rod and frame assembly. If the correction factor is or greater near the VST for that material, its algebraic sign sha
40、ll be noted and the factor applied to each test result by adding it algebraically to the apparent indentation reading. It is recommended that the apparatus be constructed of low thermal expansion material. 4.2Indenting tip, preferably of hardened steel, to long, of circular cross-section, and of are
41、a (corresponding to an indenting-tip diameter of ), fixed at the bottom of the rod (4.1). The surface of the indenting tip in contact with the specimen shall be plane and perpendicular to the axis of the rod, and free from burrs. 4.3Calibrated micrometer dial gauge (or other suitable measuring instr
42、ument), to measure to the penetration of the indenting tip into the test specimen. The thrust of the dial gauge, which contributes to the thrust on the test specimen, shall be recorded (see 4.4). NOTE 1In certain types of apparatus, the force of the dial gauge spring is directed upwards and is subtr
43、acted from the load; in other types, this force acts downwards and is added to the load. NOTE 2Since the force exerted by the spring in certain dial gauges varies considerably over the stroke, this force is measured at the position where the indenting tip has penetrated into the specimen. 4.4Weight-
44、carrying plate, fitted to the rod (4.1), and suitable weights added centrally so that the total load applied to the test specimen can be made up to for methods A50 and A120 and for methods B50 and B120. The combined downward thrust, determined during calibration of the apparatus, due to the rod, the
45、 indenting tip, the weight-carrying plate and the upward or downward force exerted by the dial gauge spring in the measurement range used during the test, shall not exceed . Other suitable devices for applying the load can be used provided the requirements specified above are met. 1)Invar and borosi
46、licate glass have been found suitable for this purpose. 10 C 0,02 mm 1,5 mm3 mm 1,000 mm20,015 mm21,128 mm0,008 mm 0,01 mm 1 mm 10 N0,2 N50 N1 N 1 N EN ISO 306:2004 3 Key 1micrometer dial gauge 2replaceable weight 3weight-carrying plate 4rod with indenting tip 5approximate level of liquid 6indenting
47、 tip 7test specimen 8test-specimen support Figure 1 Example of apparatus with a liquid-filled heating bath for determination of the VST EN ISO 306:2004 4 4.5Heating equipment, consisting of a heating bath (4.5.1) containing a liquid or of a direct-contact heating unit (4.5.2). The heating equipment
48、shall be provided with temperature-control means enabling the temperature to be raised at a uniform rate of or The heating rate shall be verified either by checking the automatically read temperature; or by checking manually the temperature change at intervals of, at the most, during the whole of th
49、e test. The requirement for the heating rate shall be considered satisfied if, over every interval during the test, the temperature change is or , respectively. For multi-position baths, the heating rate shall be verified at each test station. Key 1weight 2displacement-measurement device 3heater 4heating block 5rod with indenting tip 6temperature-measurement unit 7test specimen Figure 2 Example of apparatus with a direct-contact he