1、BRITISH STANDARD BS EN ISO 7808:1999 BS2782-7: Method722A: 1993 Implementing Amendment No.1 (renumbers the BS as BS EN ISO 7808:1999) not published separately Plastics Thermosetting moulding materials Determination of transfer flow IMPORTANT NOTE. Before reading this method it is essential to read B
2、S2782-0, Introduction, issued separately. The European Standard EN ISO7808:1998 has the status of a BritishStandard ICS 83.080.10BSENISO7808:1999 This BritishStandard, having been prepared under the directionof the Plastics andRubber Standards PolicyCommittee, was publishedunder the authority ofthe
3、Standards Board andcomesinto effect on 15April1993 BSI03-2000 The following BSI references relate to the work on this standard: Committee reference PRM/21 Draft for comment84/42061 DC ISBN 0 580 22073 7 Committees responsible for this BritishStandard The preparation of this BritishStandard was entru
4、sted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/21, upon which the following bodies were represented: British Plastics Federation British Textile Confederation Department of the Environment (Building Research Establishment) Department of Trade and Indust
5、ry (National Physical Laboratory) Electrical and Electronic Insulation Association (BEAMA Ltd.) GAMBICA (BEAMA Ltd.) Institute of Materials Ministry of Defence Packaging and Industrial Films Association Pira International RAPRA Technology Ltd. Amendments issued since publication Amd. No. Date Commen
6、ts 10348 April1999 Indicated by a sideline in the marginBSENISO7808:1999 BSI 03-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN ISO7808 3BSENISO7808:1999 ii BSI 03-2000 National foreword This British Standard is the English language version o
7、f EN ISO7808:1998. WARNING. This BritishStandard, which is identical with ISO7808, does not necessarily detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc. Act1974. Attention should be paid to any appropriate safety precautions and the method should be
8、 operated only by trained personnel. 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 immunity from legal obligations. Summ
9、ary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN ISO title page, pages2 to4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside fron
10、t cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO7808 August1998 ICS 83.080.10 Descriptors: See ISO document English version Plastics Thermosetting moulding materials Determination of transfer flow (ISO7808:1992) Plastiques Matires mouler thermodurcissables Dtermination de la fluidit
11、par transfert (ISO7808:1992) Kunststoffe Duroplaste Bestimmung des Transferflusses (ISO7808:1992) This European Standard was approved by CEN on12 June1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the s
12、tatus of a national standard without any alteration. 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).
13、A version in any other language made by translation 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, CzechRepublic, Denmark, Finland,
14、 France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussel
15、s 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref.No.EN ISO7808:1998EENISO7808:1998 BSI 03-2000 2 Foreword The text of the International Standard from Technical Committee ISO/TC61 “Plastics” of the International Organization for Stand
16、ardization (ISO) has been taken over as an European Standard by Technical Committee CEN/TC249 “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 F
17、ebruary1999, and conflicting national standards shall be withdrawn at the latest by February1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark
18、, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the UnitedKingdom. Endorsement notice The text of the International Standard ISO7808:1992 has been approved by CEN as a European Standard without any modification. C
19、ontents Page Foreword 2 1 Scope 3 2 Principle 3 3 Apparatus 3 4 Test portion 3 5 Procedure 3 6 Expression of results 3 7 Test report 3 Figure 1 Moulding tool 4 Table 1 Moulding temperatures 3ENISO7808:1998 BSI 03-2000 3 1 Scope This International Standard specifies a method for measuring the transfe
20、r flow of thermosetting moulding materials during a specified moulding process. It is intended only for production control and should not be used as part of a mandatory material specification. 2 Principle The method determines the percentage mass of moulding material that is transferred through two
21、apertures in the punch of a disc mould during a moulding process carried out under defined conditions. 3 Apparatus 3.1 Balance, to weigh50g to within 0,1g. 3.2 Hydraulic press, with a capacity of at least125kN, fitted with a controlled variable pressure-reducing valve. The press closing time, betwee
22、n loading the powder into the mould until pressure first shows on the gauge, shall not exceed10s. The final speed of closure shall be adjusted so as to avoid displacement of powder from the mould. 3.3 Moulding tool (see Figure 1), the moulding cavity of which has a diameter of90mm and a depth of25mm
23、 5mm (the depth of the cavity may be increased if necessary to accommodate bulky materials). The punch shall have two recesses2,45mm 0,01mm deep and7,5mm 0,5mm high diametrically opposite each other; their profile is shown in detail A of Figure 1. The clearance between the male and female mould part
24、s shall not exceed0,05mm (moulds wear with use and the tolerance should be checked frequently). 4 Test portion The test portion shall be a50g 0,5g portion of a sample of the moulding material to be tested. 5 Procedure 5.1 Adjust the temperature of the mould (see3.3) to the value specified in Table 1
25、 for the particular material to be tested. Table 1 Moulding temperatures 5.2 Preset the moulding pressure to7MPa 0,2MPa,12MPa 0,5MPa or19MPa 0,5MPa, chosen so that the measured transfer flow falls within the range15% to85%. 5.3 Place the test portion (see clause4) inside the mould cavity and immedia
26、tely close the press(3.2). 5.4 Allow sufficient time for the material to cure, open the press, remove the moulding, detach the extrudate, allow the moulding to cool to room temperature and then weigh it to the nearest0,1g. 5.5 Calculate the transfer flow of the test portion as described in6.1. Repea
27、t the test until the numerical values of two consecutive transfer flows so obtained do not differ by more than10% of the numerical value of their mean. 6 Expression of results 6.1 Calculate the transfer flow of the test portion as the percentage mass of material that is transferred through the punch
28、 during the moulding operation, using the formula: where m is the mass, in grams, of the moulding. 6.2 Express the mean of the two valid determinations as the transfer flow of the material under test. 7 Test report The test report shall contain the following particulars: a) a reference to this Inter
29、national Standard; b) all details necessary for complete identification of the material tested; c) the mould temperature used; d) the moulding pressure used; e) the time of flow; f) the transfer flow, as a percentage. Temperatures in degrees Celsius Material Moulding temperature Phenolic Granular po
30、lyester Epoxy Diallyl phthalate 165 2 165 2 165 2 165 2 50m 50 -100 ENISO7808:1998 4 BSI 03-2000 Figure 1 Moulding toolblankBS EN ISO 7808:1999 BS2782-7: Method722A: 1993 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for prep
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