1、BRITISH STANDARD BS EN ISO 3521:2000 BS 2782-6: Method 644A:1997 Incorporating Amendment No. 1 to BS 2782-6: Method 644A:1997 (renumbers the BS as BS EN ISO 3521:2000) and Technical Corrigendum No. 1 Plastics Unsaturated polyester and epoxy resins Determination of overall volume shrinkage (ISO 3521:
2、1997) The European Standard EN ISO 3521:1999 has the status of a British Standard ICS 83.080.10 BS EN ISO 3521:2000 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into
3、 effect on 15 May 1997 BSI 30 April-2004 ISBN 0 580 27524 8 National foreword This British Standard is the English language version of EN ISO 3521:1999. It is identical with ISO 3521:1997. It is dual numbered as BS 2782-6: Method 644A:1997. It supersedes BS 2782-6:Method 644A:1979 which is withdrawn
4、. The UK participation in its preparation was entrusted to Technical Committee PRI/42, Fibre reinforced thermosetting plastics and prepregs, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The Britis
5、h Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publ
6、ication 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 not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible internatio
7、nal/European committee any 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. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO ti
8、tle page, the EN ISO foreword page, the ISO title page, pages ii to iv, pages 1 to 5 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments 10689 April 2000 Renumbers BS 2782-6: Met
9、hod 644A:1997 as BS EN ISO 3521:2000 15092 Technical Corrigendum No. 1 30 April 2004 Correction to Clause 4 and subclause 7.4EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3521 June 1999 ICS 83.080.10 English version Plastics Unsaturated polyester and epoxy resins Determination of overall
10、volume shrinkage (ISO 3521:1997) Plastiques Rsines dpoxydes et de polyesters non saturs Dtermination du retrait global en volume (ISO 3521:1997) Kunststoffe- Ungesttigte Polyester und Epoxidharze Bestimmung der Gesamtvolumenschwindung (ISO 3521:1997) This European Standard was approved by CEN on 6 M
11、ay 1999. 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 biliographical references concerning such national standards may be obtai
12、ned 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 member into its own language and notified to the Central Secre
13、tariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN Eu
14、ropean Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: ru de Stassart, 36 B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 3521:1999 EEN ISO 3
15、521:2000 BSI 30 April 2004 Foreword to EN ISO 3521:1999 The text of the International Standard from Technical Committee ISO/TC 61, Plastics, of the International Organization for Standardization (ISO) has been taken over as a European Standard by Technical Committee CEN/TC 249, Plastics, the Secreta
16、riat 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 December 1999, and conflicting national standards shall be withdrawn at the latest by December 1999. According to the
17、CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Swe
18、den, Switzerland and the United Kingdom.EN ISO 3521:2000 ii Contents Page Foreword iii 1S c o p e 1 2 Normative reference 1 3 Definition 1 4 Principle 1 5 Apparatus 1 6 Procedure 2 7 Expression of results 3 8 Precision 4 9 Test report 4EN ISO 3521:2000 BSI 30 April 2004 iii Foreword ISO (the Interna
19、tional 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 subject for which a technical committee has be
20、en 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) on all matters of electrotechnical stan
21、dardization. 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. International Standard ISO 3521 was prepared by Technical Co
22、mmittee ISO/TC 61, Plastics, Subcommittee SC 12, Thermosetting materials. This second edition cancels and replaces the first edition (ISO 3521:1976), of which it constitutes a technical revision. Descriptors: Plastics, polyester resins, epoxy resins, castings, tests, mechanical tests, determination,
23、 shrinkage.blank ivEN ISO 3521:2000 BSI 30 April 2004 1 1 Scope This International Standard specifies a method for the determination of the overall volume shrinkage of unsaturated polyester and epoxy resins. 2 Normative reference The following standard contains provisions which, through reference in
24、 this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. 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 rece
25、nt edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 1675:1985, Plastics Liquid resins Determination of density by the pyknometer method. 3 Definition For the purposes of this International Standard, the following defin
26、ition applies. 3.1 overall volume shrinkage the sum of the shrinkage during curing and the shrinkage after curing of a casting when cooled to ambient temperature 4 Principle The overall volume shrinkage is calculated from the specific gravity of a cast specimen before and after curing. First, the sp
27、ecific gravity of the resin composition is determined: a) at the initial temperature of mixing of the components, excluding the initiators normally added to unsaturated polyesters (see 6.1.3, note 1); b) at 23 C after curing and conditioning of the cast specimen. The overall volume shrinkage is then
28、 calculated as a percentage of the change in the specific gravity before and after curing, as follows: The specific gravity at the moment of mixing is determined for the mixed components at known intervals and the results extrapolated to zero time. For components that react at elevated temperature,
29、the specific gravity of the mixture is determined by calculation from the individual specific gravities of the components. The specific gravity at 23 C of the last specimen after curing and conditioning is determined by weighing in silicone oil. 5 Apparatus 5.1 Balance, accurate to 1 mg, with a devi
30、ce for measurement of specific gravity (if possible, a rapid-acting balance). 5.2 Sinker, weighing 25 g 5 g, and of dimensions such that wall effects are avoided. Its volume at the curing temperature and its volume at 23 C 0,1 C shall be known. 5.3 Temperature-stabilized silicone-oil bath, containin
31、g oil whose specific gravity at the hardening temperature and at 23 C 0,1 C is known. Overall volume shrinkage Cured specific gravity Uncured specific gravity Cured specific gravity - - 100 =EN ISO 3521:2000 2 BSI 30 April 2004 5.4 Test tubes, length approximately 180 mm. diameter 20 mm. 5.5 Stopwat
32、ch 5.6 Dessicator 6 Procedure 6.1 Determination of specific gravity of compositions that cure at temperatures higher than ambient 6.1.1 Preparation of apparatus Determine, to an accuracy of 10 3ml, the volume V sof the sinker at the curing temperature of the composition. Weigh the sinker in air at a
33、mbient temperature (mass m s ). Then weigh the sinker together with its suspension wire in silicone oil maintained at the curing temperature of the composition (mass m s+w ). Determine the mass (mass m w ) of the suspension wire in air at ambient temperature. If the specific gravity of the silicone
34、oil at the curing temperature of the composition is not known, determine it in accordance with ISO 1675 but at the curing temperature. 6.1.2 Epoxy resins Weigh out each of the components in the proportions used to form the composition, taking a quantity large enough to carry out the determination de
35、scribed below and to cast the test specimen prepared in 6.3. Heat each of the components separately to the curing temperature. Mix the components, starting the stopwatch immediately after the introduction of the last component. This moment is taken as zero time. Continue to mix until a homogeneous m
36、ixture is obtained, then pour the mixture into the test tube all at once. Hang the sinker (preheated to the curing temperature) in the mixture and note the total mass (m s+w ), i.e. the apparent mass of the sinker and its suspension wire, after each of a series of equal intervals of time. The length
37、 of the time interval and the number of readings taken will depend on the composition being examined. Proceed simultaneously with the casting of the test specimen prepared in 6.3, using the rest of the composition prepared. Determine the mass (m s+w ) of the composition at zero time by extrapolation
38、. 6.1.3 Unsaturated polyester resins Weigh out each of the components, except initiators, in the proportions used to form the composition, taking a quantity large enough to carry out the test described below and to cast the test specimen prepared in 6.3. NOTE The initiators used in the curing of uns
39、aturated polyester resins are normally peroxides that must not be heated, because of the risk of explosion (see Manufacturers Safety Data Sheet). As the quantity of initiator used with unsaturated polyester resins is small (1 % to 2 %), the specific gravity of the other components in the mixture pro
40、vides sufficient accuracy. Mix the components weighed out. Put aside the quantity of mixture needed to cast the test specimen (see 6.3) and heat the remainder of the mixture to the curing temperature. Start the stopwatch as soon as this temperature is reached (zero time). Pour the mixture immediatel
41、y into a test tube. Hang the sinker preheated to the curing temperature, in the mixture, and note the total mass (m s+w ), i.e. the apparent mass of the sinker and the suspension wire, after each of a series of equal intervals of time. The length of the time interval and the number of readings taken
42、 will depend on the composition being examined. 6.2 Determination of specific gravity of compositions that cure at ambient temperature Since, because of the highly exothermic nature of the reaction, it is difficult to carry out measurements on compositions based on resins that react at ambient tempe
43、rature, determine the specific gravity of each component of such compositions separately, in accordance with ISO 1675, at 23 C 0,1 C. 6.3 Determination of apparent specific gravity of cast specimen 6.3.1 Preliminary measurements If the specific gravity of the silicone oil at 23 C 0,1 C is not known,
44、 determine it at that temperature in accordance with ISO 1675.EN ISO 3521:2000 BSI 30 April 2004 3 6.3.2 Measurement of mass and apparent mass of cast specimen Place 25 g 5 g of the mixed composition in a test tube. After the mixture has cured completely, cool the test tube containing the cast speci
45、men in a desiccator to ambient temperature. The results of the test will depend essentially on the curing conditions, which shall be agreed between the interested parties. For any given composition, these conditions are the curing time and the curing temperature. Weigh the test specimen in air (m c
46、). Determine its apparent mass (m c+w ) in silicone oil at 23 C 0,1 C, then weigh the suspension wire in air (m w ). Carry out the weighings in air and in silicone oil quickly to avoid humidity effects. When weighing the specimen in silicone oil, allow the specimen and bath to reach thermal equilibr
47、ium before reading off the mass. When weighing is completed, clean the specimen carefully with filter paper to remove adhering silicone oil, wash it in petroleum ether and leave it to post-cure for 1 h at the curing temperature or the post-heating temperature, in accordance with the material specifi
48、cations. (Use a temperature of 110 C for compounds that harden at normal ambient temperature.) Cool the specimen in a desiccator to ambient temperature. Again weigh the specimen in air (mass m c ). Again determine the apparent mass (m c+w ) in silicone oil at 23 C 0,1 C. If the difference %m between
49、 the total mass of the specimen plus suspension wire in air and the total apparent mass in silicone oil after post-curing is less than 0,2 % of the same difference before post-curing, take the apparent mass after post-curing for the calculation of the specific gravity. If the values of the difference %m di
