1、STD-BSI BS EN L2023-ENGL 1797 m lb24bb9 ObObL70 Lb3 - I BRITISH STANDARD I BS EN I I 12023 : 1997 I Self adhesive tapes - Measurement of water vapour transmission in a warm humid atmosphere The European Standard EN 12023 : 1996 has the status of a British Standard ICs 83.180 NO COPYING WITHOUT BSI P
2、ERMISSION EXCEPT AS PERMITTED BY COPYRIGH LAW K- CE; BS EN 12023 : 1997 This British Standard, having been prepared under the direction of the Consumer products and Services Sector Board, was pubiihed under the authority of the Standards Board and comes into effect on 15 April 1997 O BSI 1997 The fo
3、llowing BSI references relate to the work on this standard: Committee reference PKW/3 Draft for comment 9242616 DC ISBN O 680 27134 X Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PKWB, Distribution packaging, transport
4、 packaging and unit loads, upon which the following bodies were represented: British Adhesives and sealants Association British Apparel and Textile Confederation British Coatings Federation Ltd. British Fibreboard Packaging Association British Glass Manufacturem Confederation British industrial lluc
5、k Association British Plastics Federation British Retail Consortium British Rubber Manufacturers Association Ltd. British Tensional Strapping Association Ltd British Timber Merchants Association British Wood Preserving and Dampproofing Association Chamber of Shipping Chemical Industries Association
6、China Ciay Association Department of Ransport Engineering Equipment and Materials Users Association Federation of the Electronics Industry Flexible lbc Association Food and Drink Federation independent Pallet Repair Committee Institute of Grocery Distribution Metal Packaging Manufacturem Association
7、 Ministry of Defence National Association of Pallet Distributors Power Fastenings Association Pira International Road Haulage Association Ltd. Society of Occupational Medicine Storage Equipment Manufacturers Association Timber Packagmg and Pallet Confederation Timber Research and Development Associa
8、tion United Kingdom Softwood Sawmillem Association The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Adhesive Tape Manufacturers Association British Footwear Manufacturers Federation Packaging Distributem Association Pressure Sensitive Manu
9、facturem Association Amendments issued since publication I Text affected I Date Amd. No. STD-BSI-BS EN L2023-ENGL 1797 U Lb2LibbS bbL72 T3b BS EN 12023 : 1997 Contents Page CodWes responsible Inside front cover National foreword 11 Foreword 2 Text of EN 12023 3 O BSI 1997 i BS EN 12023 : 1997 Nation
10、al foreword This British Standard has been prepared by Technicd Committee PKWB and is the English language veision of EN 12023 : 1996 Self adhesive tapes - Measurement of water vapour tmmisswn in a warm humid atmosphere, published by the European Committee for Standardization (CEN). Compliance with
11、a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, inside front cover, pages i and ii, pages 1 to 8, an inside back cover and a back cover. O BSI 1997 STD-BSI BS EN 12023-ENGL 1777 1b2LibbS ObOb17LI 809 EUROPEAN STAND
12、ARD EN 12023 NORME EUR0PEE”E EXJROP -Annex B (informative) Bibliography. Contents Foreword 1 Scope 2 Normative references 3 Defjnition 4 Principle 6 Materials 6 4P- 7 8 Procedure 9 Expression of results 10 Testreport Annexes Test sample and test pieces Page 2 3 3 3 3 3 3 4 4 5 5 A (normative) Self a
13、dhesive tape: measurement of water vapour transmission in a warm humid atmosphere for adhesive tape of less than 50 mm width 6 B (informative) Bibliography 8 1 Drybox 4 Figure O ES1 1997 STD-BSI BS EN LZ23-ENGL 1777 Lb24bb7 ObObL7b bL 1 scope This standard specifies the method to determine the mass
14、of the water vapour transmitted through the adhesive tape under specific test conditions. Details of the test method depend upon the width of the adhesive tape under test. For adhesive tapes less than 50 mm width it is necessary to use annex A (normative). When test pieces below 50 mm wide are used
15、(as will be common) together with the smaller dry box the precision of this test may be reduced due to undesired moisture transmission at the adhesive seal. This part of the method should therefore be considered to give only approximate values. 2 Normative references This European Standard incorpora
16、tes by dated or undated reference, provisions from other publications. These nonnative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European
17、 Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication - - ._ I - - - referred to amlies. * o) * IS0 483 Plastics - Smu enclosures for conditioning and testing using aqueous solutions to maintain relative humiity at constant valu
18、e IS0 331L1 Test sieves - Technical requirements and testing -Part 1: Test sieves of metal wire cloth 3 Definition For the purposes of this standard the following denition appiies. water vapour transmission rate The mass of water vapour passing through a unit area of adhesive tape in unit time under
19、 prescribed conditions of humidity and temperature. 4 Principle The adhesive tape is used to separate the humid ahnosphere of relative humidity of 93 % * 2 % contained in an outer vessel from the dry atmosphere contained in a metal box, the adhesive side of the adhesive tape facing the dry atmospher
20、e. Page 3 EN 12023 : 1996 The increase in mass of the contents of the metal box due to the passage of the water vapour through the adhesive tape is measured The water vapour transmission of the adhesive tape is expressed as an increase in mass of the box assembly per unit of time per unit area of th
21、e opening in the box for a given period of exposure of the test piece to water vapour. 5 Materials 5.1 External humid atmosphere The relative humidity of 93 % 2 % shall be produced - either in the outer container by means of a satumted aqueous solution of ammonium dihydrogen phosphate (“4H2PO4) as I
22、S0 483, - or by means of a humidity cabinet. 6.2 Dry boxes The dry ahnosphere within the box shall be produced by means of pure anhydrous calcium chloride (CaCl2) of a fineness in accordance with the following specifications, in accordance with IS0 3310-1; the particles shall be able to pass through
23、 a 2 mm sieve but not pass through a 600 pm sieve. 6.3 Test solution for dry box Two percent solution of methylene blue in ethanol. 5.4 Cleaning solvent Toluene, general purpose chemical grade. 6 Apparatus 6.1 Dry box, (see figure 1) shall conform to the following requirements: It shall be construct
24、ed from a non-ageing, non-corrodible material which does not absorb moisture. It shall consist of an open box of rectangular section topped by a perfectly flat, rigid stainless steel plate, having a central rectangular opening of 100 mm X 25 111111. The overall dimensions of the plate shad be 140 mm
25、 X 65 mm. The internal dimensions of the box shall be 100 mm x 25 mm x 20 mm. The assembly shall be rigid. The plate shail be roughened with abrasive grit1) the direction of the abrasion lines being parallel to the long dimension of the opening. The total mass of the box shall not exceed 150 g. The
26、box shad be - il the box with a 2 % solution of methylene blue in ethanol. After standing for 24 h, examine the outside of the box for the presence of blue streaks indicating the position of leaks. 6.2 Container for outer humid atmosphere This container shall entirely surround the dry box. Its freed
27、om from leakages shall be such that the humidity can be maintained constant for the duration of the test. It shall consist of a closed container within which a relative humidity of 93 %* 2 % (see 6.1) shall be majnained at the temperature of test. The interior volume of the container shall be three
28、to five times greater than that. of the total volume of the dry boxes within it Care shall be taken to prevent condensation of water vapour on or near the dry boxes. 6.3 Analytical balance Sensitivity 0,l mg. 6.4 Oven The external container containing the dry boxes shall be placed in an oven at38“C
29、f2 “C. 6.6 Polished cylindrical metal roller This shall have a diameter of at least 50 mm and a mass corresponding to 2 kgkm width of the adhesive tape under test 7 Test sample and test pieces Condition the sample roll for 24 h at 23 “C f 2 “C and 50 % f 5 % relative humidity Discard the three outer
30、 tunis of adhesive tape from the roll before taking test pieces. Perform the test on three test pieces from each roll. Each test piece shall be at least 50 mm wide and more than 150 mm long. Narrower widths to a minimum of 15 mm may be used following the procedure in annex k Note that further test p
31、ieces may be required (see 8.4). 8 Procedure 8.1 Standard test conditions The test shall be carried out at 23 “C f 2 “C and 50 %I 5 % relative humidity, and at 38“Cf2“Cand93%f 2%relative humidity 8.2 Preparation of apparatus 8.2.1 Keep the empty dry box in the standard atmosphere una it is required.
32、 Clean the top plate with cotton wool soaked in toluene, and dry the plate. Fli the box evenly up to about 3 mm from the top with calcium chloride (6.2). We me that the box is not inverted or tilted in subsequent operations. 8.2.2 Condition the box for 30 min at 38 o C k 2“ C, then remove. 8.2.3 Imm
33、ediately place the box on a rigid supporting jig so that the overhanging ends of the top plate rest on the jig. The construction of this jig shall be such that it is capable of supporting, firmlx the overhanging ends of the top piate without being distort is the area of the opening in the top plate
34、of dry box (in cm2); is the increase in mass after the exposure period (in g). 10 lkst report The test report shall include the following information: a) a reference to this European Standard b) all information necessary to idenbfy the test sample; c) the date of the test; d) the results obtained e)
35、 any operation not specified in this European Standard, which may influence the results. O BSI 1997 STDeBSI BS EN 12023-ENGL 1797 LbZi.lbb9 ObOb177 390 Page 6 EN 12023 : 1996 Annex A (normative) Self adhesive tape: measurement of water vapour transmission in a warm humid atmosphere for adhesive tape
36、 of less than 50 mm width A.1 Scope This standard specifies the method to determine the mass of the water vapour transmitted through the adhesive tape under specific test conditions. Details of the test method depend upon the width of the adhesive tape under test For adhesive tapes less than 50 mm w
37、idth it is necessary to use this annex. When test pieces below 50 mm wide are used (as will be common) together with the smaller dry box, the precision of this test may be reduced due to undesired moisture transmission at the adhesive seal. This part of the method should therefore be considered to g
38、ive only approximate dues. A.2 Normative references “his European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate phes in the text and the publications are listed hereafter. For dated references, subsequ
39、ent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. Is0 483 Phtics - SmaU enclosures for conditioning and testing using aqu
40、eous solutions to maintain relative humidity at constant vaue Is0 3310-1 Test sieves - lkhnical requirements and testing -Part 1: Test sieves of metal wire clout A.3 Definition For the purposes of this standard the following definition applies. A.3.1 water vapour transmission rate The mass of water
41、vapour passing through a unit area of adhesive tape in unit time under prescribed conditions of relative humidity and temperature. A.4 Principle The adhesive tape is used to separate the humid ahnosphere of relative humidity of 93 % f 2 % contained in an outer vessel from the dry atmosphere containe
42、d in a metai box, the adhesive side of the adhesive tape facing the dry atmosphere. The increase in mass of the contents of the metal box due to the passage of the water vapour through the adhesive tape is measured. The water vapour hmsmission of the adhesive tape is expressed as an increase in mass
43、 of the box assembly per unit of time per unit area of the opening in the box for a given period of exposure of the test piece to water vapour. A.6 Materials A.6.1 External humid atmosphere The relalive humidity of 93 % f 2 % in the outer container shall be produced either: -by means of a saturated
44、aqueous solution of ammonium dihydmgen phosphate (“2PO4) as IS0 483, or -by means of a humidity cabinet. A.6.2 Dru boxes The dry atmosphere within the box shall be produced by means of pure anhydrous calcium chloride (CaC12) of a fineness in accordance with the following specifications, in accordanc
45、e with IS0 3310-1; the particles shall be able to pass through a 2 mm sieve but not pass through a 600 pn sieve. A.6.3 Test solution for dry box Wo percent solution of methylene blue in ethanol. A.6.4 Cleaning solvent Toluene: general purpose chemical grade. A.6 Apparatus A.6.1 Dry box, shall confor
46、m to the following requirements It shall be constructed from a non-ageing, non-corrodible materiai which does not absorb moisture. It shall consist of an open box of rectangular section topped by a perfectly flat, rigid stainless steel piate, having a centrai rectangular opening of 10 mm x 100 mm. T
47、he overall dimensions of the plate shali be 14Omm X 50mm. The intemal dimensions of the box shall be loom x 1omm x 20mm. The assembly shall be rigid The plate shall be roughened with No. 240 is the area of the opening in the top plate of dry box (in un2); is the increase in mass after the exposure p
48、eriod (in g). A.10 Test report The test report shail include the following information: a) a reference to the annex A of this European Standard; b) all information necessasy to identify the test sample; c) the date of the test; d) the results obtained; e) any operation not specified in this European
49、 Standard, which may influence the results. Annex B (informative) Bibliography FEPA Standard for coated abrasive grajns of fused dumina and silicon carbide 43-GEb1984. O BSI 1997 STD-BSI BS EN-EZ023-ENGL 1777 lb24bb7 ObOb182 785 BS EN 12023 : 1997 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Contract requirements A British Standard
