1、BRITISH STANDARDBS EN ISO 8987:2005Plastics Phenolic resins Determination of reactivity on a B-transformation test plateThe European Standard EN ISO 8987:2005 has the status of a British StandardICS 83.080.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50
2、g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS 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 4National forew
3、ordThis 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 It supersedes BS EN ISO 8987:1998 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/21, Testing of plastics, which has the resp
4、onsibility to: aid enquirers to understand the text; 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
5、of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe 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 C
6、orrespondence 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 necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does n
7、ot of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, 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
8、 notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 8987October 2005ICS 83.080.10 Supersedes EN ISO 8987:1998 English VersionPlastics - Phenolic resins - Determin
9、ation 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 Europ
10、ean 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 conce
11、rning 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 lan
12、guage 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, Mal
13、ta, 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 b
15、y 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. Acc
16、ording 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, Lithu
17、ania, 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)INTE
18、RNATIONAL 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 O
19、rganization 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 estab
20、lished 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 standardizat
21、ion. 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 voting
22、. 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 p
23、atent 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 salts
24、. 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 hea
25、ted 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 plate
26、, 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 ne
27、cessary 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 sho
28、wn 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 8987:20
29、052 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 depressio
31、n 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 reached
32、 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 is
33、 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, perm
34、issible 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 interv
35、al 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 may
36、 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 o
37、nto 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 a
39、t 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, stop
40、 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 foll
41、owing 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 d
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