1、BRITISH STANDARD BS EN ISO 9944:1995 BS2782-4: Method451Q: 1995 Plastics Phenolic resins Determination of electrical conductivity of resin extracts The European Standard EN ISO9944:1995 has the status of a British StandardBSENISO9944:1995 This British Standard, having been prepared under the directi
2、onof the Materials and Chemicals Sector Board, was published under the authority ofthe Standards Board and comesinto effect on 15November1995 BSI 11-1999 The following BSI references relate to the work on this standard: Committee referencePRI/42 Draft for comment89/37065DC ISBN 0 580 23849 0 Committ
3、ees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/42, Fibre reinforced thermosetting plastics and prepregs, upon which the following bodies were represented: British Plastics Federation Chemical Industries Association Departme
4、nt of the Environment (Building Research Establishment) Department of Trade and Industry (National Physical Laboratory) Electrical and Electronic Insulation Association (BEAMA Ltd.) European Resin Manufacturers Association Ministry of Defence Motor Industry Research Association RAPRA Technology Ltd.
5、 Amendments issued since publication Amd. No. Date CommentsBSENISO9944:1995 BSI 11-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN ISO9944 3BSENISO9944:1995 ii BSI 11-1999 National foreword This British Standard has been prepared by Technical
6、 Committee PRI/42 and is the English language version of EN ISO9944:1995 Plastics Phenolic resins Determination of electrical conductivity of resin extracts, published by the European Committee for Standardization (CEN), which is identical with ISO9944:1990 published by the International Organizatio
7、n for Standardization (ISO). It is incorporated into BS2782-4 Methods of testing plastics Chemical Properties as Method451Q. 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
8、 with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theENISOtitle page, pages2 to4 and a back cover. This standard has been updated (see copyright date) and may have had amend
9、ments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO9944 August1995 ICS 83.080.10 Descriptors: Plastics, thermosetting resins, phenoplasts, tests, electrical tests, determination, conductivity English ver
10、sion Plastics Phenolic resins Determination of electrical conductivity of resin extracts (ISO 9944:1990) Plastiques Rsines phnoliques Dtermination de la conductivit lectrique desxtraits de rsine (ISO9944:1990) Kunstsoffe Phenolharze Bestimmung Leitfhigkeit von Harzextrakten (ISO9944:1990) This Europ
11、ean Standard was approved by CEN on1995-07-13. CEN members are bound to comply with the requirements of the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical
12、 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 translation under the responsibility of a CEN mem
13、ber 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Swe
14、den, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 Copyright reserved to all CEN members Ref. No. EN ISO9944:1995EENISO9944:1995 BSI 11-1999 2 Fore
15、word The text of the International Standard from ISO/TC61, Plastics, of the International Organization for Standardization has been taken over as a European Standard by the Technical Committee CEN/TC249, Plastics. This European Standard shall be given the status of a national standard, either by pub
16、lication of an identical text or by endorsement, at the latest by February1996, and conflicting national standards shall be withdrawn at the latest by February1996. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belg
17、ium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Principle 3 3 Reagents 3 4 Apparatus 3 5 Procedure 3 6 Expression of results 3 7 Test report 4EN
18、ISO9944:1995 BSI 11-1999 3 1 Scope This International Standard specifies a method for the determination of the electrical conductivity of phenolic resin extracts at23 C 2 C. The method is important for applications in which such resins are used as impregnating materials. 2 Principle An acetone/water
19、 mixture is added to a solution of the resin. The precipitate thus produced is allowed to settle, and the conductance of the suspension remaining above the resin is measured. The conductivity is then calculated from the measured conductance. 3 Reagents 3.1 Acetone, reagent grade. 3.2 Water, deionize
20、d, conductivity less than or equal to204S/m. 3.3 Acetone/deionized-water mixture, containing8 volumes of acetone(3.1) and4 volumes of deionized water(3.2). 4 Apparatus 4.1 Conductivity cell, with known cell constantk. 4.2 Conductance-measuring instrument, capable of measuring conductance to a minimu
21、m reading of14S with a precision of5%, in the frequency range50Hz to3000Hz. Alternatively, a resistance measuring instrument with the same precision may be used. 4.3 Beaker, nominal capacity250ml. 4.4 Magnetic stirrer 4.5 Balance, scale interval1mg. 5 Procedure 5.1 Preparation of test portion In the
22、 case of resin solutions, weigh out10g 0,05g of the solution into a250ml beaker(4.3). In the case of powdered solid resins, take8g of the resin and dissolve it in acetone(3.1) in a ratio by mass of1 : 1. Weigh out10g 0,05g of the resin solution thus obtained into a250ml beaker(4.3). 5.2 Determinatio
23、n Add10g of acetone(3.1) to the test portion prepared in5.1. Stir the mixture with a magnetic stirrer(4.4) until the liquid is homogeneous. With vigorous stirring, add100ml of acetone/deionized-water mixture(3.3) in drops. Adjust the dropping rate so that the resin does not coagulate but initially f
24、orms an emulsion. When all the acetone/water mixture has been added, stir for a further3min and then allow to settle for3min. Pour off the milky-turbid suspension above the resin into the conductivity cell(4.1) and bring the temperature of the suspension to23 C 2 C. Measure the conductance of the su
25、spension, but not for longer than3min. WARNING When measurements are made, persistent contamination of the measuring cell may occur. For this reason, the cell shall be cleaned and recalibrated before each measurement. Cleaning may be done by boiling in concentrated acid or as described in Anal. Chem
26、. Vol.51, May1978, page741. 5.3 Alternative method In special cases, the following method may be used. Place8,0g of resin in a100ml polyethylene vessel. Add80ml of deionized water(3.2) and extract for20h at95 C in an oven. Cool the sample to room temperature and measure the conductance (see5.2). 5.4
27、 Blank test Carry out a blank test under the same conditions with the same amounts of reagents, but omitting the resin. 6 Expression of results 6.1 Calculation The conductivity of the phenolic resin solution, expressed in microsiemens per centimetre, is given by the equation = k(G 1 G 0 ) Report the
28、 conductivity in microsiemens per centimetre, rounded to one decimal place. 6.2 Precision Repeatability (one operator, one apparatus):10%. Reproducibility (several operators, several sets of apparatus):10%. where k is the cell constant, expressed in reciprocal centimetres; G 0 is the conductance, in
29、 microsiemens, of the blank test solution(5.4); G 1 is the conductance, in microsiemens, of the resin suspension (see5.2).ENISO9944:1995 4 BSI 11-1999 7 Test report The test report shall include the following information: a) a reference to this International Standard; b) the type, identification and
30、 date of manufacture of the phenolic resin tested; c) the date of sampling; d) the conductivity of the phenolic resin solution and the conductances of the resin suspension and the blank test solution; e) any deviation, by agreement or otherwise, from the procedure specified; f) the date of the test.
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