《BS-EN-12429-1998.pdf》由会员分享,可在线阅读,更多相关《BS-EN-12429-1998.pdf(12页珍藏版)》请在三一文库上搜索。
1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12429:1998 The Euro
2、pean Standard EN 12429:1998 has the status of a British Standard ICS 91.100.99 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Thermal insulating products for building applications Conditioning to moisture equilibrium under specified temperature and humidity conditions License
3、d Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:40:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was published under the authority of the Standards Board and comes into effect o
4、n 15 November 1998 BSI 1998 ISBN 0 580 30296 2 BS EN 12429:1998 Amendments issued since publication Amd. No.DateText affected National foreword This British Standard is the English language version of EN 12429:1998. It is one of a large number of European test method standards which have been introd
5、uced for thermal insulating products. Guidance on the content and application of these new test methods is given in PD 6621. The UK participation in its preparation was entrusted by Technical Committee B/540, Energy performance of materials, components and buildings, to Subcommittee B/540/1, Europea
6、n Standards for thermal insulation, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European develo
7、pments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Cat
8、alogue under the section entitled International Standards Correspondence Index, or by 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 responsible for their cor
9、rect 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, the EN title page, pages 2 to 9 and a back cover. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:4
10、0:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide
11、 for CEN national Members. Ref. No. EN 12429:1998 E EUROPEAN STANDARDEN 12429 NORME EUROPE ENNE EUROPA ISCHE NORM June 1998 ICS 91.120.10 Descriptors: Thermal insulation, buildings, thermal insulating materials, tests, hygroscopic tests, determination of content, humidity, specimen preparation Engli
12、sh version Thermal insulating products for building applications Conditioning to moisture equilibrium under specified temperature and humidity conditions Produits isolants thermiques destine s aux applications du ba timent Conditionnement jusqua le quilibre hygroscopique dans des conditions de tempe
13、 rature et dhumidite spe cifie es Wa rmeda mmstoffe fu r das Bauwesen Einstellen der Ausgleichsfeuchte bei definierten Temperatur- und Feuchtebedingungen This European Standard was approved by CEN on 25 June 1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipul
14、ate the conditions for giving this European Standard the status 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 exi
15、sts 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 Secretariat has the same status as the official versions. CEN members are the national standards bo
16、dies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:40:24 GMT+00:00 2006, Uncontrolled Copy, (
17、c) BSI Page 2 EN 12429:1998 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 88, Thermal insulating materials and products, the Secretariat of which is held by DIN. This European Standard is one of a series of standards which specify test methods for determini
18、ng dimensions and properties of thermal insulating materials and products. It supports a series of product standards for thermal insulating materials and products which derive from the Council Directive of 21 December 1988 on the approximation of laws, regulations and administrative provisions of th
19、e Member States relating to construction products (Directive 89/106/EEC) through the consideration of the essential requirements. This European Standard contains the following normative annex: annex A Determination of limiting value of moisture content change and conditioning time factor by experime
20、nt; and two informative annexes: annex B Computer calculations to determine the limiting value of moisture content change; annex C Calculations of conditioning time to reach equilibrium using the Fourier number. This European Standard has been drafted for applications in buildings but it may also be
21、 used in other areas where it is relevant. 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 1998, and conflicting national standards shall be withdrawn at the latest by December 1998. Acco
22、rding to the 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, Portuga
23、l, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions and abbreviations3 4Principle3 5Apparatus3 6Test specimens4 7Procedure4 8Calculation and expression of results5 9Accuracy5 10Test report5 Annex A (normative) Determination of lim
24、iting value of moisture content change and conditioning time factor by experiment6 Annex B (informative) Computer calculations to determine the limiting value of moisture content change7 Annex C (informative) Calculations of conditioning time to reach equilibrium using the Fourier number8 Licensed C
25、opy: sheffieldun sheffieldun, na, Sat Oct 28 09:40:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 12429:1998 BSI 1998 1 Scope This European Standard specifies equipment and procedures to condition a thermal insulating product to equilibrium moisture content at (232) 8C and (505) % relative
26、humidity. The standard is also applicable to thermal insulating products with moulded skins but is not normally relevant for faced products or for products with other surface treatments. NOTE 1The normally specified moisture content is the result of the equilibrium between the atmosphere and the pro
27、duct at (232) 8C and (505) % relative humidity. The standard may also be used if a product has to be conditioned to other relative humidities. NOTE 2The moisture equilibrium may due to hysteresis effects differ depending on whether the equilibrium has been reached by absorption or by desorption. In
28、addition, perfect equilibrium may require a very long time to be reached. Therefore it is necessary to accept equilibrium within a certain accuracy. NOTE 3For products which do not absorb moisture, conditioning is not needed. It should nevertheless be ensured that there is no water on the surface be
29、fore testing. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendmen
30、ts to or revisions of these publications apply to this draft European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 12085, Thermal insulating products for building applications Determination of lin
31、ear dimensions of test specimens. prEN ISO 12571, Building materials Determination of hygroscopic sorption curves (ISO/DIS 12571:1996). 3 Definitions and abbreviations 3.1 Definitions For the purposes of this standard, the following definitions apply. 3.1.1 atmosphere 23/50 a controlled atmosphere a
32、t a temperature of (232) 8C and a relative humidity of (505) % 3.1.2 hygroscopic range moisture content in equilibrium with 98 % relative humidity or lower 3.1.3 equivalent time, Dte d2hours, where d is the numerical value of the test specimen thickness in centimetres 3.1.4 limiting value of moistur
33、e content change, Dw1 the change in moisture content during a specified period of equivalent time, Dte, at the upper limit of the hygroscopic range 3.1.5 conditioning time factor, g the factor by which the equivalent time, Dte, has to be multiplied to determine the required conditioning period in th
34、e hygroscopic range 3.2 Abbreviations EPSexpanded polystyrene ICBinsulation cork board MWmineral wool PURpolyurethane foam XPSextruded polystyrene foam 4 Principle The conditioning is carried out using one or two steps, see Figure 1. Step 1 is conditioning the test specimen to a moisture content wit
35、hin the hygroscopic range. This conditioning may take place in an atmosphere 23/50 or in a ventilated oven. The choice of condition depends on the type of material. Alternative I shows drying in atmosphere 23/50 and alternative II drying in a heated oven. Step 2 is conditioning the test specimen to
36、equilibrium with an atmosphere 23/50, after the moisture content has reached the hygroscopic range. 5 Apparatus 5.1 Temperature and humidity controlled chamber, capable of maintaining the atmosphere 23/50. 5.2 Temperature controlled ventilated oven, that takes the air from an environment of 23/50. T
37、he oven shall be capable of maintaining a temperature of (405) 8C or (705) 8C or (1055) 8C as specified in the relevant product standard or any other European technical specification. 5.3 Measuring instruments, capable of measuring the linear dimensions of test specimens in accordance with EN 12085,
38、 to an accuracy of 1 %. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:40:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 12429:1998 BSI 1998 6 Test specimens 6.1 Dimensions of test specimens The thickness of the test specimens shall be the original product thickness. The test spe
39、cimens shall be squarely cut and square, having sides of (2001) mm. 6.2 Number of test specimens The number of test specimens shall be as specified in the relevant product standard. If the number is not specified, then at least three test specimens shall be conditioned. NOTEIn the absence of a produ
40、ct standard or any other European technical specification, the number of test specimens may be agreed between parties. 6.3 Preparation of test specimens The test specimens shall be cut so that they are representative of the full size product. Any surface skins, facings and/or coatings shall be retai
41、ned. 6.4 Preconditioning of test specimens If the procedure shown in Figure 1a) is used ensure that the test specimens have a moisture content well above the hygroscopic range. If in this case the hygroscopic sorption curve for the product is not known, it shall be determined in accordance with prEN
42、 ISO 12571. NOTETo increase the moisture content to above the hygroscopic range it may be necessary to immerse the test specimens in water, expose them to the exterior climate or expose them to water vapour in accordance with EN 12088: Thermal insulating products for building applications Determinat
43、ion of long-term water absorption by diffusion. 7 Procedure 7.1 General Determine the linear dimensions in accordance with EN 12085 to an accuracy of 1 %. Calculate the volume, V, of each test specimen. The conditioning is carried out using either of the alternative procedures shown in Figure 1a) (s
44、teps 1 and 2) or the procedure shown in Figure 1b) (step 2 alone). The test specimens shall be installed in the chamber or ventilated oven such that substantially free air circulation occurs around them. In some cases, the moisture content will be within the hygroscopic range before the conditioning
45、 starts. In this case step 1 shall be omitted and only step 2 in accordance with Figure 1b) shall be followed. 7.2 Conditioning step 1 Place the test specimens in an atmosphere 23/50, or in a ventilated oven at an elevated temperature. The temperature shall be as specified in the relevant product st
46、andard. NOTE 1In the absence of a product standard or any other European technical specification the temperature may be agreed between parties. w0is the initial moisture content; w98is the moisture content at upper limit of hygroscopic range; weis the moisture content in equilibrium with atmosphere
47、23/50. Figure 1 Moisture content versus time during step 1 and step 2 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:40:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 12429:1998 BSI 1998 At preselected intervals of time, depending on the product tested and the atmosphere used, re
48、move and weigh the test specimens to determine any mass changes. Continue until the change in moisture content is less than the limiting value, i.e. Dw 60174 ICB31722 PUR1841 The criterion to check that the hygroscopic range is reached is that: the change in moisture content, Dw, during a specified
49、period of equivalent time, Dte, is less than a limit value of Dw1. The assumption behind this type of criterion is that the rate of drying for a certain material of a certain thickness at a certain temperature is always the same at the upper limit of the hygroscopic range, regardless of the initial moisture content. From the slope of the drying curves, the rate of drying at the upper limit of the hygroscopic range is determined. The limiting values Dw1are determined as the rate of drying multiplied by an interval
链接地址:https://www.31doc.com/p-3739126.html