1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 4900:2011T e x t i l e g l a s s M a t s a n d fabrics Determination of contact mouldabilityBS ISO 4900:2011 BRITISH STANDARDNational forewordThis British Standard is the
2、UK implementation of ISO 4900:2011. The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e P R I / 4 2 , F i b r e r e i n f o r c e d t h e r m o s e t t i n g plastics and prepregs.A list of organizations represented on this committee can be obtained on reques
3、t to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011 ISBN 978 0 580 74664 2 ICS 59.100.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British S
4、tandard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2011.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 4900:2011Textile glass Mats and fabrics Determination of contact mouldabilityVerre textile Mats et tissus Dtermination de
5、 laptitude au moulage au contact ISO 2011Reference numberISO 4900:2011(E)Second edition2011-11-15ISO4900INTERNATIONAL STANDARDBS ISO 4900:2011ISO 4900:2011(E)COPYRIGHT PROTECTED DOCUMENT ISO 2011All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilize
6、d in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22
7、 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in Switzerlandii ISO 2011 All rights reservedBS ISO 4900:2011ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Stan
8、dards is normally carried out through ISO technical committees. Each member body interested in a subject 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 t
9、ake part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is
10、 to prepare International Standards. 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 least 75 % of the member bodies casting a vote.Attention is drawn to the possibility
11、 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 patent rights.ISO 4900 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 13, Composites and reinforcement fibres.This second editi
12、on cancels and replaces the first edition (ISO 4900:1990), of which it constutes a minor revision designed to specify more clearly how many specimens are tested, in which directions they are cut out of the sample and how the results are calculated in each case.ISO 4900:2011(E) ISO 2011 All rights re
13、served iiiBS ISO 4900:2011BS ISO 4900:2011INTERNATIONAL STANDARD ISO 4900:2011(E)Textile glass Mats and fabrics Determination of contact mouldability1 ScopeThis International Standard specifies a method for the determination of the contact mouldability of textile glass mats and fabrics.NOTE The hand
14、 lay-up method of moulding is generally not regarded as lending itself to objective determinations. However, if the process is carried out by the same operator, useful comparisons can be drawn between results obtained with different mats or fabrics.2 Normative referencesThe following referenced docu
15、ments are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 291, Plastics Standard atmospheres for conditioning and testing3 Terms and
16、definitionsFor the purposes of this document, the following terms and definitions apply.3.1mouldability of a textile glass mat (fabric)ease with which the mat (fabric), when it is wetted out with resin, can be made to conform permanently to a mould of specified configuration4 PrincipleThe mould is i
17、n the form of steps as indicated in Figure 1, with progressively decreasing radii of the peaks and valleys of the mould.A rectangular strip of mat or fabric is laid up on the mould and the minimum radius at which the mat or fabric conforms to the contour is recorded as the mouldability. The time tak
18、en to perform the test is also recorded.5 Conditioning and testing atmosphereCondition the test specimens for at least 6 h in one of the standard laboratory atmospheres specified in ISO 291. Carry out the test under the same conditions.6 Apparatus and materials6.1 Radius mould, as shown in Figure 1,
19、 with the specified radii marked at each ridge.The mould shall be made from glass-fibre-reinforced plastic.6.2 Standard “hand lay-up” polyester resin (to be agreed between the supplier and the purchaser), incorporating methyl ethyl ketone peroxide catalyst and cobalt naphthenate accelerator, to give
20、 a pot life of approximately 30 min at the specified test temperature. ISO 2011 All rights reserved 1BS ISO 4900:20116.3 Balance, accurate to 0,1 g.6.4 Stop-watch, graduated in seconds.6.5 Bristle paint brush, 50 mm in width, with bristles 50 mm to 60 mm in length.6.6 Sharp knife.6.7 Mould release a
21、gent.7 Procedure7.1 Preparation of the mouldKeep the mould as clean as possible. Before each test, coat the surface of the mould with mould release agent. After every test, remove all excess resin using solvent and/or a plastic scraper (not a sharp metal one which might damage the surface).7.2 Mould
22、ing of the specimen7.2.1 Users should note that Subclauses 7.2.5 to 7.2.10 are written for a right-handed operator. Left-handed operators shall carry out this part of the procedure in the same way, but starting with the mould positioned so that the larger radii are to the left, and working from left
23、 to right.7.2.2 Using the knife (6.6), cut out specimens 950 mm 10 mm in length and 150 mm 2 mm in width. With both mats and fabrics, cut out three specimens parallel to and three perpendicular to the length direction of the mat or fabric.7.2.3 Weigh a specimen (mass mg).7.2.4 Weigh in an unwaxed co
24、ntainer a quantity of the resin (6.2) equal to two and a half times the specimen mass plus approximately 50 g to allow for wastage on the brush (6.5) and in the container.7.2.5 Position the mould (6.1) with the larger radii to the right.7.2.6 Using the brush, paint a thin coat of resin, the same wid
25、th as the specimen, along the centreline of the mould.7.2.7 Place the specimen over the painted band, letting the mat or fabric rest on the peaks of the corrugations, and with the right-hand end of the specimen coinciding with the right-hand end of the mould. Start the stop-watch (6.4) and immediate
26、ly, by means of the brush, apply resin to the specimen as evenly as possible, leaving a very small dry area at the extreme left-hand end of the specimen for handling.7.2.8 Holding the left-hand end of the specimen up, clear of the mould, so that the mat or fabric only touches the mould at the start
27、of the corrugations on the right-hand side, push the specimen by means of the brush into the first of the corrugations.7.2.9 Lowering the left hand slowly, work the specimen by means of the brush into and over the succeeding corrugations fairly rapidly until the specimen is roughly moulded in.7.2.10
28、 Returning to the right-hand end, mould the specimen to the contours of the corrugations by means of the brush, progressively moving to the left.ISO 4900:2011(E)2 ISO 2011 All rights reservedBS ISO 4900:2011Dimensions in millimetresKey1 radii (all curved sections are full quadrants; flats are tangen
29、ts at 45 to the horizontal)Figure 1 Radius mould for mats and fabrics7.2.11 If at any corrugation the specimen “springs away” from the mould, continue the moulding operation until the specimen conforms to the contour, i.e. do not proceed on to a more difficult corrugation until all the previous ones
30、 have been moulded correctly.Note the time elapsed between the first application of the resin to the specimen and the end of the operation (working time).The maximum working time shall be 5 min. At the end of this period, inspect the specimen.7.2.12 Note the ridge of the corrugation (not the valley)
31、 at which the specimen will no longer conform to the contour.Record the mouldability value as the actual radius, in millimetres, of the previous, less severe contour. In case of doubt, use the following guideline:If the specimen has broken away over more than 25 % of its width on a particular ridge,
32、 record the radius of the previous ridge as the mouldability value.Normally, the mouldability value is ascertained on the uncured laminate. In case of doubt, it might be necessary to wait for polymerization of the resin before removing the laminate from the mould to enable the underside to be examin
33、ed for air pockets and non-conformity with the mould.7.2.13 Weigh the cured laminate (mass ml).7.2.14 Repeat the test on the remaining specimens.ISO 4900:2011(E) ISO 2011 All rights reserved 3BS ISO 4900:20118 Expression of results8.1 Mouldability valueFor both mats and fabrics, calculate the averag
34、e of the radii recorded for the three specimens cut out parallel to the length direction of the mat or fabric and the average of the radii recorded for the three specimens cut out perpendicular to the length direction of the mat or fabric, and round to the nearest 1 mm in each case.8.2 Ratio of mass
35、 of reinforcement to mass of resinCalculate the ratio, R, of the mass of the reinforcement to the mass of the resin in the laminate using the equation:Rmm m=gl gwhereml is the mass of the laminate;mgis the total mass (glass plus size and/or binder) of the reinforcement.Calculate the average of the t
36、hree results obtained for each set of specimens, expressed to one place of decimals.9 Test reportThe test report shall include the following information:a) a reference to this International Standard;b) the reference number and a full description of the mat or fabric;c) a full description of the resi
37、n;d) the formulation of the catalysed and accelerated resin system used and the viscosity of the system at the test temperature;e) the average value and the individual values of the mouldability, the working time and the ratio of reinforcement to resin content, by mass, for each set of three specime
38、ns;f) details of any operations not specified in this International Standard as well as of any incidents liable to have influenced the results;g) the date of the test;h) any other relevant information.ISO 4900:2011(E)4 ISO 2011 All rights reservedBS ISO 4900:2011BS ISO 4900:2011ISO 4900:2011(E) ISO
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