1、CEN EN*717-3 76 3404589 O13b T7 = BRITISH STANDARD Wood-based panels - Determination of formaldehyde release Part 3. Formaldehyde release by the flask method The European Standard EN 7173 : 1996 has the status of a British Stan- ICs 79.060 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COP
2、YRIGHT LAW ims*-r?m-T4-*T 2 BS EN 7173 : 1996 CEN ENa7L7-3 76 3404587 0136887 713 Arnd. No. Date BS 7173 : 1996 Text affected This British Standard, having been prepared under the diredion of the Sector Board for Building and Civil Engineering, was published under the authority of the Standards Boar
3、d and comes into effect on 15 September 1996 O ES1 1996 The foliowing BSI references relate to the work on this standard: Committee reference Bf541 Draft for comment 93/111164 DC ISBN O 680 26888 2 Committees responsible for this British Standard The prepasation of this British Standard was entruste
4、d to Technid Committee l3/541, Wood based panels, upon which the following bodies were represented: APA Engineered Wood Association Association of British Plywood and Veneer Manufacturem British Woodworking Federation Council of the Forest Industries of British Columbia Deparlment of the Environment
5、 (Building Research Establishment) Finnish Plywood International Fiat Roofing Contractors Advisory Board Forestry Commission Furniture Indusry Research Association Institution of Smm Engineem Local Authority Organizations Mined Bonded Board Products Federation National Federation of Roofing Contract
6、om National Housebuilding Council National Panel Products Association Royal Institute of British Architects Smd Board Association limber Research and Development Association limber We Federation Wood Panel Indushies Federation Zurich Municipal Building Guarantee CEN EN*717-3 96 3404589 0136890 63.5
7、BS EN 717-3 : 1996 Contents page CommiaeeS responsible Inside front cover National foreword ii Foreword 2 lxt of EN 7173 3 CEN EN*7L7-3 96 3404589 0336893 571 BS EN 7173 : 1996 National foreword This British Stanard has been prepared by Technid Committee B/541 and is the English hguage version of EN
8、 717-3 : 1996 Wood-based panels - Determination of formddehyde release -Part 3: Formaldehyde release by themk method, published by the European Committee for Standardization (CEN). EN 717-3 was published as a result of internaiional discussion in which the UK took an active part. It is one of a seri
9、es of standards specifying methods for determinjng formaldehyde potentkd in or formaldehyde release V is the volume of the thiosulfate titration solution, in millilitres; Vo is the volume of thiosulfate titration for the blank, in millili-; c (Na2SzO3) is the concentration of sodium thiosulfate solu
10、tion, in moles per litre. NOTE: 1 mi 0,l mom thiosulfate solution corresponds to 1 mi 0,05 moM iodine solution and 1,5 mg formaldehyde. 7.3.6.3 FomLaldehyde calibration solution Using the concentration determined in 7.3.6.2, calculate the volume of the formaldehyde solution which will contain 15 mg
11、formaldehyde. It.ansfer this volume, using a microburette (6.2.8), to a 1000 ml volumetric flask (6.2.3) and make up to the mark with AB is the absorbance of an analysis with Wed -T f is the slope of the cabbration curve, in milligrams per miliitre; H is the moisture content of the test pieces, in p
12、ercent; m is the mass of the test pieces, in grams. 9 Bst report The test report shall be issued in accordance with EN 3261. Additiom, the test report shall include the following information: - type of board; - density of the board according to EN 323, in kilograms per cubic metre; - information reg
13、arding age, fhbhing, sanding etc.; - date of formaldehyde determination; - moisture content, in percent, at the time of testing; - fhsk value (F,) in mdhgmms per kilogram exprd to 0,l mg/kg ovendry board (individuai values of each determination and mean due); - description of further details. O BSI
14、1996 - CEN EN*7L7-3 96 3404589 0336899 862 BS EN 7173 : 1996 List of references See national foreword. CEN EN*7L7-3 96 m 3404.589 OL3b900 304 m BS EN 717-3 : 1996 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for prepari
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