1、BRITISH STANDARD BS EN ISO 12115:1997 Fibre-reinforced plastics Thermosetting moulding compounds and prepregs Determination of flowability, maturation and shelf life The European Standard EN ISO12115:1997 has the status of a BritishStandard ICS83.120BSENISO12115:1997 This BritishStandard, having bee
2、n prepared under the directionof the Sector Board forMaterials and Chemicals, waspublished under the authorityof the Standards Boardand comes into effect on 15August1997 BSI03-2000 ISBN 0 580 28028 4 National foreword This BritishStandard is the English language version of EN ISO12115:1997. It is id
3、entical with ISO12115:1997. The UK participation in its preparation was entrusted to Technical Committee PRI/42, Fibre reinforced thermosetting plastics and prepregs, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee an
4、y enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references A
5、ttention is drawn to the fact that CEN and CENELEC standards normally include an annex which lists normative references to international publications with their corresponding or European publications. The BritishStandards which implement these international or European publications may be found in t
6、he BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are resp
7、onsible for their correct application. Compliance 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, theEN ISO title page, page2, the ISO title page, pagesii toiv, pages1 to9
8、and aback 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 front cover. Amendments issued since publication Amd. No. Date CommentsBSENISO12115:1997 BSI 03-2000 i Contents Page National for
9、eword Inside front cover Foreword 2 Foreword iii Text of ISO12115 1ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO12115 May1997 ICS83.120.00 Descriptors: See ISO document English version Fibre-reinforced plastics Thermosetting moulding compounds and prepregs Determination of flowabi
10、lity, maturation and shelf life (ISO12115:1997) Plastics renforcs de fibres Compositions de moulage et primprgns Dtermination de la fluidit, de la maturation et de la dure de vie (ISO12115:1997) Faserverstrkte Kunststoffe Hrtbare Formmassen und Prepregs Bestimmung der Fliefhigkeit, Reifung und Gebra
11、uchsdauer (ISO12115:1997) This European Standard was approved by CEN on1997-05-10. CEN members are bound to comply with 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
12、 bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official versions (English, French, German). A version in any other language made by translation under the responsibili
13、ty 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, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands
14、, Norway, Portugal, Spain, Sweden, 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 1997 CEN All rights of exploitation in any form and by any means reserv
15、ed worldwide for CEN national Members. Ref.No.ENISO12115:1997EENISO12115:1997 BSI 03-2000 2 Foreword The text of the International Standard ISO12115:1997 has been prepared by Technical Committee ISO/TC61 “Plastics” in collaboration with Technical Committee CEN/TC249 “Plastics”, the secretariat of wh
16、ich 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 November1997, and conflicting national standards shall be withdrawn at the latest by November1997. According to the CEN/CENELEC
17、Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerl
18、and and the UnitedKingdom. Endorsement notice The text of the International Standard ISO12115:1997 was approved by CEN as a European Standard without any modification.ENISO12115:1997 ii BSI 03-2000 Contents Page Foreword iii Introduction 1 1 Scope 1 2 Normative references 1 3 Definitions 1 4 General
19、 2 5 Apparatus 2 6 Sampling 3 7 Conditioning 3 8 Test specimens 3 9 Procedure 4 10 Expression of results 4 11 Precision 5 12 Test report 5 Figure 1 Typical flowability curve obtained by methodI 6 Figure 2 Typical curves obtained by methodII 6 Figure 3 Apparatus for applying a constant load to the sp
20、ecimen 7 Figure 4 Punch attachment 8 Figure 5 Mould cavity 8 Figure 6 Test mould with sensors 9 Descriptors: Plastics, reinforced plastics, thermosetting resins, moulding materials, ingredients, prepregs, tests, determination, viscosity, maturation, life (durability), test equipment.ENISO12115:1997
21、BSI 03-2000 iii Foreword ISO (the International 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 subje
22、ct for which a technical committee has been established 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
23、) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standar
24、d ISO12115 was prepared by Technical Committee ISO/TC61, Plastics, Subcommittee SC13, Composites and reinforcement fibres.iv blankENISO12115:1997 BSI 03-2000 1 Introduction The flowability of a moulding compound is a property which describes the ability of the compound to fill a mould cavity during
25、the moulding operation. The flowability varies with the age of the moulding compound due to the occurrence of a thickening process. This so-called maturation process is normally initiated by an additive, the aim being to prevent significant separation of the components of the moulding compound, and
26、yet ensure sufficient flow for the moulding compound to be easy to handle and for it to spread out to fill the whole mould cavity when it is moulded. When the flowability of a moulding compound has developed to a defined limit, the compound is said to have reached its matured state. This means it ca
27、n be handled and moulded satisfactorily under given operating conditions. The maturation and shelf life are determined from flowability measurements. The flowability is measured at several different points in time after production of the moulding compound, and the change in flowability plotted as a
28、function of time. The shelf life of the moulding compound is determined by assessing the ease of handling and moulding behaviour as given by the flowability. Experience indicates that in some cases shelf life may also be dependent on the cure characteristics of the moulding compound (seeISO12114). M
29、aturation and shelf life are not parameters in their own right. For a particular moulding compound, the shelf life, for instance, may even differ from one set of moulding conditions to another and from one application to the next. 1 Scope This International Standard specifies two methods for the det
30、ermination of the flowability of fibre-reinforced thermosetting moulding compounds and prepregs. The methods apply to allfibre-reinforced thermosetting moulding compounds and differ in the test conditions and the apparatus required. The methods may be used to assess the influence of individual compo
31、nents of the moulding compound on the moulding behaviour by determining the flowability of the compound. They are also suitable for quality control purposes, as well as the development of moulding compound formulations. The major field of application is with moulding compounds based on unsaturated p
32、olyester (UP) resins. MethodI is a flowability test carried out at room temperature. Conducting the test at room temperature reduces the effect on the results of changes is the temperature of the moulding compound during the test. MethodII is a flowability test carried out under commonly used mouldi
33、ng conditions. In addition, the plate produced may be used for further testing. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid
34、. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Stan
35、dards. ISO472:1988, Plastics Vocabulary. ISO8605:1989, Textile glass reinforced plastics Sheet moulding compound (SMC) Basis for a specification. ISO8606:1990, Plastics Prepregs Bulk moulding compound (BMC) and dough moulding compound (DMC) Basis for a specification. ISO12114:1997, Fibre-reinforced
36、plastics Thermosetting moulding compounds and prepregs Determination of curing behaviour. 3 Definitions For the purposes of this International Standard, the terms and definitions given in ISO472, ISO8605 and ISO8606 apply, plus the following definitions: 3.1 flowability the time-depending ability of
37、 a thermosetting moulding compound to flow and fill the cavity of a given mould under given conditions 3.2 maturation the process of thickening of thermosetting moulding compounds to a given level of flowability without significant separation of the components 3.3 matured state the level of thickeni
38、ng at which the flowability of a thermosetting compound is such that it can be handled and moulded satisfactorily under given operating conditionsENISO12115:1997 2 BSI 03-2000 3.4 shelf life the period after production of a thermosetting compound during which the flowability remains at a level at wh
39、ich the compound can be moulded without the need to make significant changes in the moulding conditions from those normally used 3.5 elementary unit the smallest normally commercially available entityof a given product. The description (form, dimensions, mass,etc.) of the elementary unit will normal
40、ly be defined in the product specification. Elementary units may be supplied in the form of rolls or packages, for instance NOTEFor a given product, the dimensions, mass or volume of the elementary unit may change, as manufacturing techniques evolve, without necessarily causing any modification in t
41、he properties of the product or the way in which these properties vary within the elementary unit. 4 General 4.1 MethodI This method calls for an unconstrained test specimen to be subjected to a constant load by a punch. The specimen is caused to flow to the side, and the change in height of the pun
42、ch as it sinks is measured (seeFigure 1). Fibre-reinforced moulding compounds exhibit a change in flowability during a flow process, due to their non-Newtonian behaviour. Two values are therefore needed to express the flowability of a moulding compound, one value expressing the instantaneous flowabi
43、lity and the other the change in flowability due to the non-Newtonian behaviour of the compound. The vertical motion of the punch depends on the flowability of the moulding compound and on the applied load. A moulding compound is considered as being suitably tested if its flowability is such that, a
44、fter a load application period of45s, the punch has sunk to a level between30% and70% of the original thickness of the specimen. The test load is therefore selected to meet this condition. By carrying out the test at suitable intervals after production, the maturation thickening process can be analy
45、sed, in particular the point at which this process levels out and the point at which the compound ceases to be mouldable without significant changes in the moulding conditions, the difference between these two points being the shelf life. NOTEFor unsaturated polyester resin, the dependence of this t
46、hickening on temperature is a non-linear one. Consequently, the results of tests at room temperature may not accurately reflect the performance of the material at the actual moulding conditions. 4.2 MethodII This method calls for a test specimen to be moulded in a heated mould in a press under the n
47、ormally used production conditions. The method is designed to determine the force necessary for the specimen to spread out and fill the mould within a certain time. A given mass of sheet moulding compound, cut to the required size, or bulk moulding compound is placed in the centre of the mould cavit
48、y. The moulding compound is then caused to flow and is cured at the required pressure and temperature. The mould closing force is chosen such that filling of the cavity takes10s 5s. It is important that the curing process has no effect on the flowability of the moulding compound during the time in w
49、hich the compound is filling the mould. For fast-curing compounds, therefore, a filling time of10s may be too long, and a filling time of5s may be required. During the moulding process, the mould closing force and the pressure in the moulding compound at the centre and at the rim of the cavity are measured with sensors and recorded as a function of time (seeFigure 2). An assessment of the flowability (i.e.whether it is acceptable or not) is then made from the curves thus produced. Comparison of flowability assessments from dif
