BS-ISO-8257-2-1990.pdf
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1、BRITISH STANDARD BS ISO 8257-2:1990 Implementation of ISO 8257-2:1990 Plastics Poly(methyl methacrylate) (PMMA) moulding and extrusion materials Part 2: Preparation of test specimens and determination of properties UDC 678.744.335 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:13 GMT+0
2、0:00 2006, Uncontrolled Copy, (c) BSI BS ISO 8257-2:1990 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 August 1995 BSI 12-1999 The following BSI ref
3、erences relate to the work on this standard: Committee reference PRI/35 Draft for comment 85/35535 DC ISBN 0 580 24641 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/35, Speciality thermoplastics moulding materials
4、, upon which the following bodies were represented: British Plastics Federation British Telecommunications plc Department of Trade and Industry (National Physical Laboratory) ERA Technology Ltd. Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Federation of the Electronics In
5、dustry Ministry of Defence Peratec Limited RAPRA Technology Ltd. Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 8257-2:1990 B
6、SI 12-1999i Contents Page Committees responsibleInside front cover National forewordii Forewordiii Text of ISO 8257-21 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 8257-2:1990 ii BSI 12-1999 National foreword This British Standard
7、reproduces verbatim ISO 8257-2:1990 and implements it as the UK national standard. This British Standard is published under the direction of the Sector Board for Materials and Chemicals whose Technical Committee PRI/35 has the responsibility to: aid enquirers to understand the text; present to the r
8、esponsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available f
9、rom Customer Services, BSI, 389 Chiswick High Road, London W4 4AL. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunit
10、y from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indic
11、ated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 8257-2:1990(E) ii BSI 12-19
12、99 Contents Page Forewordiii 1Scope1 2Normative references1 3Preparation of test specimens1 4Conditioning3 5Determination of properties3 Table 1 Plastic melt temperature as a function of melt flow rate2 Table 2 Dependence of the constant a on viscosity number VN2 Table 3 Methods of test for PMMA mou
13、lding material and moulded test specimens4 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 8257-2:1990(E) BSI 12-1999iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bo
14、dies (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. International organizatio
15、ns, 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. Draft International Standards adopted by the technical committees are circulat
16、ed to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 8257-2 was prepared by Technical Committee ISO/TC 61, Plastics. ISO 8257 consists of the following parts, under the general
17、title Plastics Poly(methyl methacrylate) (PMMA) moulding and extrusion materials: Part 1: Designation; Part 2: Preparation of test specimens and determination of properties. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed C
18、opy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 8257-2:1990(E) BSI 12-19991 1 Scope 1.1 This part of ISO 8257 specifies procedures for moulding test specimens of PMMA materials in a specified state and methods for measuring their properties. Any p
19、roperty listed in this part of ISO 8257 and referred to in combination with ISO 8257-1 shall be determined by the method referred to in this part of ISO 8257. 1.2 No figures are quoted for these properties. Those required for the designation of PMMA materials for moulding and extrusion are given in
20、ISO 8257-1. Other properties shall be determined by the appropriate methods referred to in this part of ISO 8257. 1.3 The values determined in accordance with this part of ISO 8257 will not necessarily be identical to those obtained using specimens of different dimensions and/or prepared by differen
21、t procedures. They may also be influenced by colorants and other additives. The values obtained for the properties of a moulding depend on the moulding compound, the shape, the test method and the state of anisotropy. The last-mentioned depends on the gating and the moulding conditions, for example
22、temperature, pressure or injection rate. Any subsequent treatment must also be considered, for example conditioning or annealing. 1.4 The thermal history and the internal stresses of the specimens may strongly influence thermal and mechanical properties and resistance to environmental stress crackin
23、g, but exert less effect on the electrical properties, which mainly depend on the chemical composition of the moulding compound. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 8257. At the time of pub
24、lication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 8257 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers
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