1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58B-transformation test plateThe European Standard EN ISO 8987:2005 has the status of a British Stand
2、ardICS 83.080.10Plastics Phenolic resins Determination of reactivity on a BRITISH STANDARDBS EN ISO 8987:2005BS EN ISO 8987:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 12 January 2006 BSI 12 January 2006ISBN 0 580 46562 4Cross-referen
3、cesThe British Standards which implement international or European publications 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 St
4、andards Online.This publication does not purport to include all the necessary 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.Summary of pagesThis document comprises a front cove
5、r, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii and iii, a blank page, pages 1 to 4, 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 p
6、ublicationAmd. No. Date Comments present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.A list of organizations rep
7、resented on this committee can be obtained on request to its secretary.National forewordThis British Standard is the official English language version of EN ISO 8987:2005. It is identical with ISO 8987:2005. It supersedes BS EN ISO 8987:1998 which is withdrawn.The UK participation in its preparation
8、 was entrusted to Technical Committee PRI/21, Testing of plastics, which has the responsibility to: aid enquirers to understand the text;EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 8987October 2005ICS 83.080.10 Supersedes EN ISO 8987:1998 English VersionPlastics - Phenolic resins - Determi
9、nation of reactivity on a B-transformation test plate (ISO 8987:2005)Plastiques - Rsines phnoliques - Mthodes dvaluationde la ractivit sur plaque dessai de transformation austade B (ISO 8987:2005)Kunststoffe - Phenolharze - Bestimmung der Reaktivitt aufeiner B-Zeit-Prfplatte (ISO 8987:2005)This Euro
10、pean Standard was approved by CEN on 29 August 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references conc
11、erning such nationalstandards 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 translationunder the responsibility of a CEN member into its own la
12、nguage and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Ma
13、lta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in
14、 any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 8987:2005: EForeword This document (EN ISO 8987:2005) 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
15、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 April 2006, and conflicting national standards shall be withdrawn at the latest by April 2006. This document supersedes EN ISO 8987:1998. Ac
16、cording 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, Ireland, Italy, Latvia, Lith
17、uania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 8987:2005 has been approved by CEN as EN ISO 8987:2005 without any modifications. EN ISO 8987:2005Reference numberISO 8987:2005(E)INT
18、ERNATIONAL STANDARD ISO8987Third edition2005-10-01Plastics Phenolic resins Determination of reactivity on a B-transformation test plate Plastiques Rsines phnoliques Mthodes dvaluation de la ractivit sur plaque dessai de transformation au stade B EN ISO 8987:2005ii iiiForeword ISO (the International
19、Organization for Standardization) is a worldwide federation 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 esta
20、blished has the right to be represented on that committee. International 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 standardiza
21、tion. 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 International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for votin
22、g. 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 the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such
23、patent rights. ISO 8987 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 12, Thermosetting materials. This third edition cancels and replaces the second edition (ISO 8987:1995), which had been revised to allow the temperature of the test plate to be controlled by melting salt
24、s. EN ISO 8987:2005blank1Plastics Phenolic resins Determination of reactivity on a B-transformation test plate 1 Scope This International Standard specifies methods for the determination of the B-transformation time of phenolic resins at a specified temperature and under specified conditions on a he
25、ated test plate. Two methods are described, each with a different test plate: Method A plate with depressions in the form of segments of spheres; Method B flat plate without depressions. 2 Principle The condensation of the phenolic resin is carried out to the B-stage on one of two types of test plat
26、e, depending on the method. 3 Method A: Determination on a plate with depressions 3.1 Apparatus 3.1.1 Thermostatic control device, permissible temperature variation 0,5 C. 3.1.2 Hotplate, on which the test plate can be fixed in a suitable manner to obtain optimum heat transfer. NOTE No hotplate is n
27、ecessary if a test plate with an integral heater is used. 3.1.3 Glass rod, 5 mm in diameter, tapering to about 2 mm in diameter at one end. 3.1.4 Balance, scale interval 0,01 g. 3.1.5 Syringe. 3.1.6 Stopwatch, with at least 1 s sub-divisions. 3.1.7 B-transformation test plate, with depressions as sh
28、own in Figure 1, with or without an integral heater. Suitable melting salts may be used for accurate control of the heater. 3.2 Number of tests Conduct one or more tests, depending on the requirements of the appropriate International Standard or as agreed between the parties concerned. EN ISO 8987:2
29、0052 Dimensions in millimetres Key 1 hole for temperature sensor of thermostatic control device 2 hole for thermometer stem 3 protective metal tube for thermometer Figure 1 B-transformation test plate 3.3 Procedure Bring the B-transformation test plate (3.1.7) to the required temperature and place a
30、 box, open on top, round the test plate to provide protection against draughts. Pour (0,5 0,05) g of phenolic resin into one of the depressions in the test plate and start the stop watch (3.1.6) when the resin touches the plate. Liquid resins or phenolic resin solutions may be placed in the depressi
31、on with a syringe (3.1.5). Stir the resin with the glass rod (3.1.3), using short circular movements from the edge of the depression towards the middle. For longer B-transformation times, stir initially for one minute and then at one-minute intervals for 10 s. If the B-transformation point is reache
32、d within a one-minute interval, repeat the test, knowing the approximate test time, to give an accurate determination. Towards the end of the test, when the resin becomes viscous, stir continuously. Briefly raise the rod and observe if the resin is drawn out in a thread. The B-transformation point i
33、s reached when the thread breaks when the rod is briefly raised. When the resin reaches this state, stop the stopwatch. Report the measured time in minutes and seconds. EN ISO 8987:200534 Method B: Determination on a flat plate without depressions 4.1 Apparatus 4.1.1 Thermostatic control device, per
34、missible temperature variation 0,5 C. 4.1.2 Hotplate, on which the test plate can be fixed in a suitable manner to obtain optimum heat transfer. NOTE No hotplate is necessary if a test plate with an integral heater is used. 4.1.3 Spatula, about 10 cm long and 1,25 cm wide. 4.1.4 Balance, scale inter
35、val 0,01 g. 4.1.5 Syringe. 4.1.6 Stopwatch, with at least 1 s sub-divisions. 4.1.7 B-transformation test plate, measuring approximately 15 cm 15 cm, with a hard, chromium-plated surface and fitted with a thermometer in a thermometer well, with or without an integral heater. Suitable melting salts ma
36、y be used to control the temperature. 4.2 Number of tests Conduct one or more tests, depending on the requirements of the appropriate International Standard or as agreed between the parties concerned. 4.3 Procedure Bring the test plate (4.1.7) to the required temperature. Pour (0,5 0,05) g of resin
37、onto the test plate. If the resin is in powder form, take a 1 cm high heap on the end of the spatula (4.1.3). If it is liquid, or in solution, place it on the test plate using the syringe (4.1.5). Start the stop watch (4.1.6) at the same time as the resin touches the hotplate. As quickly as possible
38、, distribute the resin uniformly over an area of 4 cm 7,5 cm, stroking the material back and forth with the flat end of the spatula. Keep the leading edge of the spatula up slightly and, using gentle pressure, continue the stroking action at the rate of one stroke every 3 s, reversing the direction
39、at the end of each stroke. Do not remove the spatula completely from the curing resin until the test is completed. Continue stroking until the material shows the characteristics of a set, i.e. it no longer strings out and has gelled to a rubbery state or has become hard and stiff. At this point, sto
40、p the stopwatch and record the elapsed time in minutes and seconds. Scrape the cured resin off the plate at once. Take care not to scratch the surface of the plate. 5 Precision (test error) Repeatability: 4 % Reproducibility: 10 % EN ISO 8987:20054 6 Test report The test report shall include the fol
41、lowing information: a) a reference to this International Standard and the method used (method A or B); b) all details necessary for complete identification of the sample tested; c) the temperature of the test plate; d) the B-transformation time (individual values and mean value); e) the date of the
42、determination. EN ISO 8987:2005blankBS EN ISO BSI389 Chiswick High RoadLondonW4 4AL8987:2005BSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorpor
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