1、BSI Standards PublicationBS EN 1910:2016Wood flooring and woodpanelling and cladding Determination of dimensionalstabilityBS EN 1910:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 1910:2016. It supersedes BS EN 1910:2013 which is withdrawn.The UK participa
2、tion in its preparation was entrusted to Technical Committee B/543, Round and sawn timber.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible f
3、or its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 87957 9 ICS 79.080 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy
4、 and Strategy Committee on 31 May 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 1910:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1910 April 2016 ICS 79.080 Supersedes EN 1910:2013English Version Wood flooring and wood panelling and cladding - Deter
5、mination of dimensional stability Planchers en bois et lambris et bardages en bois - Dtermination de la stabilit dimensionnelle Holzfubden und Wand- und Deckenbekleidungen aus Holz - Bestimmung der Dimensionsstabilitt This European Standard was approved by CEN on 20 February 2016. CEN members are bo
6、und 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 bibliographical references concerning such national standards may be obtained on application to the
7、CEN-CENELEC Management Centre 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 CEN-CENELEC Management Centre
8、 has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
9、 Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 B
10、russels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1910:2016 EBS EN 1910:2016EN 1910:2016 (E) 2 Contents Page European foreword . 4 1 Scope 5 2 Normative references 5 3 Terms and definitions . 5 4 Principle . 5 5 Test equ
11、ipment 5 5.1 Conditioning room or enclosure 5 5.2 Stabilizing room or enclosure 6 5.3 Trays 6 5.4 Measuring equipment . 6 5.5 Scales . 6 5.6 Oven . 6 6 Test specimens . 6 6.1 Dimensions and shape 6 6.2 Sampling . 7 6.3 Conditioning 7 7 Measurements 7 7.1 Mass 7 7.2 Dimensions of the test specimen .
12、7 7.3 Warp 7 7.3.1 General 7 7.3.2 Twist 7 7.3.3 Procedure. 7 7.3.4 Expression of results 9 7.4 Moisture content . 9 8 Procedure. 9 8.1 Initial measurements . 9 8.2 Exposure to the humid climate 9 8.3 Measurements after stabilization in the humid climate . 9 8.4 Exposure to the dry climate 9 8.5 Mea
13、surements after stabilization in the dry climate 10 8.6 Oven drying 10 9 Calculation and expression of the results of a test specimen 10 9.1 Moisture content 10 9.2 Dimensional changes 10 9.3 Warp . 10 9.3.1 Cup . 10 9.3.2 Spring . 11 9.3.3 Bow 11 9.3.4 Twist . 11 10 Accuracy of the 10 test specimen
14、s . 11 10.1 Dimensional changes 11 10.2 Warp . 11 BS EN 1910:2016EN 1910:2016 (E) 3 11 Test report 11 Bibliography . 13 BS EN 1910:2016EN 1910:2016 (E) 4 European foreword This document (EN 1910:2016) has been prepared by Technical Committee CEN/TC 175 “Round and sawn timber”, the secretariat of whi
15、ch is held by AFNOR. 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 October 2016, and conflicting national standards shall be withdrawn at the latest by October 2016. Attention is drawn to the po
16、ssibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1910:2013. According to the CEN/CENELEC Internal Regulations, the national standards o
17、rganizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembou
18、rg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 1910:2016EN 1910:2016 (E) 5 1 Scope This European Standard specifies a method of test to determine the dimensional changes and warp of the elements of wood
19、flooring and wood panelling and cladding. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of th
20、e referenced document (including any amendments) applies. EN 13183-1, Moisture content of a piece of sawn timber Part 1: Determination by oven dry method EN 13183-2, Moisture content of a piece of sawn timber Part 2: Estimation by electrical resistance method EN 13647, Wood flooring and wood panelli
21、ng and cladding Determination of geometrical characteristics EN 13756:2002, Wood flooring Terminology 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13756:2002 and the following apply. 3.1 twist deformation of the element lengthwise with a helical pa
22、ttern SOURCE: EN 844-3:1995 4 Principle Measure the dimensional changes of the test specimen after initial conditioning in a standard atmosphere and again after conditioning in a specified climate. The test specimen shall be lying in horizontal position in the test chamber. Express the results as a
23、percentage of variation of the relevant dimension measured in the initial standard climatic conditions. Record the warp and relate to the basis of measurement. 5 Test equipment 5.1 Conditioning room or enclosure The conditioning room or enclosure shall be equipped with monitoring thermometers and hy
24、grometers. It shall be suitable to condition the test specimen either in: climate A, defined by a relative humidity of (65 5) % and a temperature of (20 2) C; or climate B, defined by a relative humidity of (50 5) % and a temperature of (23 2) C. BS EN 1910:2016EN 1910:2016 (E) 6 5.2 Stabilizing roo
25、m or enclosure The stabilizing room or enclosure shall be equipped with monitoring thermometers and hygrometers. It shall be capable of maintaining the conditions specified in Table 1: Table 1 Conditions maintained by a stabilizing room or enclosure Condition No. 1 Condition No. 2 Temperaturea20 C 2
26、3 C Relative humiditybDry climate: 30 % 30 % Humid climate: H1: or 75 % 75 % H2: 85 % 85 % aThe permitted deviation for temperature is 2 C. bThe permitted deviation for relative humidity is 5 %. It shall be possible to change from one climate to the other within 24 h. 5.3 Trays The trays shall provi
27、de non-continuous support to the test specimen in the conditioning and stabilizing rooms. The clearance between supports shall be sufficient to allow the ventilation between the test specimens. 5.4 Measuring equipment All the dimensions shall be measured as defined in EN 13647. 5.5 Scales Scales sha
28、ll be accurate to 0,1 % of the masses to be measured. 5.6 Oven The oven shall be able to operate at (103 2)C to bring the test specimens to the dry state. 6 Test specimens 6.1 Dimensions and shape Tests specimens are elements at the time of the first delivery. Measurements are made on the element. E
29、lements more than 2000 mm require no end sealing. Elements between 2000 and 1000 mm shall have one end sealed. Elements less than or equal to 1000 mm shall have both ends sealed. The shortest length of a reduced element is 250 mm. BS EN 1910:2016EN 1910:2016 (E) 7 6.2 Sampling The method of installa
30、tion has impact on the dimensional stability. Unless otherwise specified, 10 test specimens selected at random shall be taken. 6.3 Conditioning Prior to exposure in the specified climate (5.2), the test specimen shall be conditioned to equilibrium either in climate A or in climate B as defined in 5.
31、1. 7 Measurements 7.1 Mass Record the mass of each test specimen after initial conditioning (6.3) and after conditioning in the specified climate (5.2). 7.2 Dimensions of the test specimen Measure the dimensions as defined in EN 13647. 7.3 Warp 7.3.1 General Measure the cup, the bow and the spring a
32、s defined in EN 13647. The forces applied to the test specimen with the apparatus shall not modify the measurements beyond the permitted deviations defined in this standard. 7.3.2 Twist Measure the twist as defined below. 7.3.2.1 Principle Determine twist by measuring the gap between the reference s
33、urface and the deformed corners of the element. 7.3.2.2 Apparatus a) Dial gauge. It shall give readings accurate to the nearest 0,01mm and have a cylindrical flat end with a diameter of 5 1 mm. b) Reference plane support. Horizontal rigid plane support (e.g. marble, granite or steel made) with smoot
34、h surface. 7.3.3 Procedure Place the element with its upper surface in contact with the reference plane support. Prior to testing, mark measuring points on the element at 10 mm from the edges of the deformed corners. A mass of 1 kg shall be positioned as show in Figure 1 on to one deformed corner (i
35、f present). BS EN 1910:2016EN 1910:2016 (E) 8 Reset the dial of the gauge, on the surface of the reference plane support, and place the gauge at the diagonal opposite side above the mark measuring point. Measure and note the Z value (see Figure 2) with an accuracy to the nearest 0,1 mm. Move the mas
36、s to the diagonally opposite corner and by the gauge repeat the measure at the diagonal opposite point of the mass. Measure and note the Z value (see Figure 2) with an accuracy to the nearest 0,1 mm. Figure 1 Positioning of one kg mass onto different corners Figure 2 Twist Z and L values BS EN 1910:
37、2016EN 1910:2016 (E) 9 7.3.4 Expression of results Twist is expressed as a percentage of the length and it is calculated as follow: = (%) 100ZTwistLwhere Z is the maximum value measured thickness of the single element (mm); L is th length of the element (mm). Thickness and length of single element s
38、hall be measured according to EN 13647 clauses. 7.4 Moisture content If required, the moisture content of an element is measured in its initial state at the equilibrium either in climate A or in climate B as defined in 5.1 and after the conditioning in dry and humid climates with one of the followin
39、g methods: by determination of mass loss during oven drying, as specified in EN 13183-1. The moisture content is calculated according to 9.1; with an electrical device, by measuring wood resistance, as specified in EN 13183-2. NOTE Be aware of higher deviation when measuring moisture content below 6
40、 % by electric resistance method. 8 Procedure 8.1 Initial measurements Once the initial conditioning according to 6.3 is achieved, carry out the measurements defined in Clause 7. 8.2 Exposure to the humid climate After the initial measurements, expose the test specimen to the specified humid climate
41、, as defined in 5.2, for 4 weeks. Achieve the correct conditions according to Table 1 within 24 h. Carry out the measurements defined in 7.1. The duration of each conditioning period can be reduced if variation of mass does not exceed 0,1 % between two successive measurements made in any 24 h interv
42、al. 8.3 Measurements after stabilization in the humid climate Carry out the measurements defined in Clause 7. 8.4 Exposure to the dry climate Once the measurements in 8.3 are recorded, expose the test specimen in the specified dry climate as defined in 5.2 for 4 weeks. Achieve the correct conditions
43、 within 24 h. Carry out the measurements defined in 7.1. BS EN 1910:2016EN 1910:2016 (E) 10 The duration of each conditioning period can be reduced if variation of mass does not exceed 0,1 % between two successive measurements made in any 24 h interval. 8.5 Measurements after stabilization in the dr
44、y climate Carry out the measurements defined in Clause 7. 8.6 Oven drying Once the test specimen has been through all the prescribed climates, proceed to its oven drying with the oven specified in 5.6. The test specimen may not be reduced to less than 250 mm. Oven dry state is reached if mass variat
45、ion is not more than 0,1 % between two successive measurements made in any 24 h interval. 9 Calculation and expression of the results of a test specimen 9.1 Moisture content Calculate using the following formula: =sdd100mmmwhere is the moisture content of the test specimen, after each stabilization
46、process, in % to significant decimal; mdis the mass of the test specimen after oven drying, in g; msis the mass of the test specimen after each stabilization, in g. 9.2 Dimensional changes In each direction, the cumulative relative change is calculated with the following formula: hdcri18()100-DDhd =
47、 Dwhere dcris the cumulative relative dimensional change, in % to two decimals; Diis the dimension after initial stabilization, with an accuracy of 0,01 mm; Ddis the dimension after dry conditioning, with an accuracy of 0,01 mm; Dhis the same dimension after humid conditioning, with an accuracy of 0
48、,01 mm. h 15 for climate H1, h = 18 for climate H2. NOTE The values for h are derived from tables giving the moisture content of solid timber in relation to temperature and relative humidity. 9.3 Warp 9.3.1 Cup Determine the absolute warp for each climate and express with an accuracy of 0,05 mm. BS
49、EN 1910:2016EN 1910:2016 (E) 11 For each climate, express the relative warp as a percentage of the actual surface width derived from the absolute averaged ones with an accuracy of 0,01 %. 9.3.2 Spring Determine the absolute warp for each climate and express with an accuracy of 0,25 mm. For each climate, express the relative warp as a percentage of the test specimen length derived from the absolute averaged ones with an accuracy of 0,01 %. 9.3.3 Bow Determine the absolute warp for each climate and express with an accuracy
