1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12029 : 1997 The Eu
2、ropean Standard EN 12029 : 1996 has the status of a British Standard ICS 55.040; 83.180 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Self adhesive tapes Determination of the water-soluble corrosive ionsBS EN 12029 : 1997 This British Standard, having been prepared under the
3、 direction of the Consumer Products and Services Sector Board, was published under the authority of the Standards Board and comes into effect on 15 February 1997 BSI 1997 The following BSI references relate to the work on this standard: Committee reference PKW/3 Draft for comment 92/43823 DC ISBN 0
4、580 26801 2 Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PKW/3, Distribution packaging, transport packaging and unit loads, upon which the following bodie
5、s were represented: British Adhesives and Sealants Association British Apparel and Textile Confederation British Coatings Federation Ltd. British Fibreboard Packaging Association British Glass Manufacturers Confederation British Industrial Truck Association British Plastics Federation British Retail
6、 Consortium British Rubber Manufacturers Association Ltd. British Tensional Strapping Association Ltd. British Timber Merchants Association British Wood Preserving and Damp-proofing Association Chamber of Shipping Chemical Industries Association China Clay Association Cranfield Logistics Department
7、of Transport Engineering Equipment and Materials Users Association Federation of the Electronics Industry Flexible IBC Association Food and Drink Federation Independent Pallet Repair Committee Institute of Grocery Distribution Metal Packaging Manufacturers Association Ministry of Defence National As
8、sociation of Pallet Distributors Power Fastenings Association Pira International Road Haulage Association Ltd. Society of Occupational Medicine Storage Equipment Manufacturers Association Timber Packaging and Pallet Confederation Timber Research and Development Association United Kingdom Softwood Sa
9、wmillers 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 British Steel Industry (Wire Section) Packaging Distributors Association Pressure Sensi
10、tive Manufacturers AssociationBS EN 12029 : 1997 BSI 1997 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 12029 3ii BSI 1997 BS EN 12029 : 1997 National foreword This British Standard has been prepared by Technical Committee PKW/3 and is the Engli
11、sh language version of EN 12029 : 1996 Self adhesive tapes Determination of the water-soluble corrosive ions, published by the European Committee for Standardization (CEN). Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document co
12、mprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cover and a back cover.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 1996 Copyright re
13、served to CEN members Ref. No. EN 12029 : 1996 E EUROPEAN STANDARD EN 12029 NORME EUROPE ENNE EUROPA ISCHE NORM May 1996 ICS 83.180 Descriptors: Adhesive tapes, chemical properties, corrosion, metals, tests, measurement, ions, soluble matter, water English version Self adhesive tapes Determination o
14、f the water-soluble corrosive ions Rubans auto-adhe sifs De termination des ions corrosifs solubles dans leau Klebeba nder Bestimmung von wasserlo slichen, korrosiven Ionen This European Standard was approved by CEN on 1996-04-19. CEN members are bound to comply with the CEN/CENELEC Internal Regulat
15、ions 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 Central Secretariat or to any CEN member. This Euro
16、pean 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 Secretariat has the same status as the official versions. CEN members are the nati
17、onal standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 12029 : 1996 BSI 1997 Foreword This European Standard has been prepared by the Technical C
18、ommittee CEN/TC 253, Self adhesive tapes, the Secretariat of which 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 November 1996, and conflicting national standards shall be with
19、drawn at the latest by November 1996. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Ne
20、therlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Principle 3 3 Reagents and materials 3 4 Apparatus 3 5 Test samples and test pieces 3 6 Procedure 3 7 Expression of results 5 8 Test report 5Page 3 EN 12029 : 1996 BSI 1997 1) Do not
21、fold the adhesive tape with adhesive sides together before making the extraction. 2) In case of acetate tapes, boil the water for 10 min only. 1 Scope This standard specifies a method to give an indication of the liability of an adhesive tape to cause corrosion. If amounts of water-soluble ions are
22、negligible (pH near neutrality and low conductivity of aqueous extract) this indicates that the adhesive tape is suitable for applications where corrosion must be avoided. Adhesive tapes with higher concentrations of water-soluble ions may cause corrosion in use. This test may be useful for electric
23、al applications where the adhesive tape is in contact with metallic surfaces. 2 Principle An aqueous extract of the adhesive tape is prepared. The water-soluble impurities are determined by measuring the pH and conductivity of the aqueous extract. 3 Reagents and materials 3.1 Deionized water which h
24、as a conductivity of not more than 0,2 mS/m and a pH value of between 6,5 and 7,5. 3.2 Solution of known specific conductivity prepared by dissolving 0,0746 g of analytically pure dry potassium chloride in deionized water and diluting the solution to one litre at a temperature of 23C. 4 Apparatus 4.
25、1 pH meter with glass electrode: the instrument shall be graduated in 0,1 units or less. 4.2 Conductivity meter: a conductivity cell (see figure 1) in conjunction with a bridge circuit supplied with current at a frequency of 500 Hz to 3 000 Hz. The instrument shall be such that it indicates the cond
26、uctivity with a maximum error of 10 %. 4.3 Flask and reflux condenser: suitably sized and made of borosilicate high grade resistance or quartz. 4.4 Bunsen burner or electrical heater 4.5 Carbon dioxide trap 5 Test samples and test pieces Discard the three outer turns of adhesive tape from the sample
27、 roll before taking test pieces. Take as test pieces strips of adhesive tape approximately 25 mm wide taking care to avoid contamination. Take sufficient test pieces to satisfy requirements of 6.2. 6 Procedure 6.1 Blank test Carry out a blank test with the deionized water before each extraction. If
28、the conductivity of the blank exceeds 0,2 mS/m, use another vessel. Retain extract for 6.4.2. 6.2 Preparation of the aqueous extract Place the adhesive tape test pieces, cut into portions of about 1 cm 21 ) , in the proportion of 1 g of adhesive tape to 100 cm 3 of deionized water, in the suitably s
29、ized borosilicate (high grade resistance) or quartz flask, fitted with a reflux condenser of the same high quality glass, or quartz. Take care to avoid contamination of the adhesive tape in doing this. Boil the water for an hour 2) taking care not to char the adhesive tape. After this time immediate
30、ly fit a carbon dioxide trap to the flask, then cool the extract as quickly as possible. 6.3 Measurement of pH Take a portion of the freshly prepared aqueous extract from 6.2 and immediately measure the pH electrometrically at 23 C 2 C, using a glass electrode. 6.4 Measurement of conductivity 6.4.1
31、Determination of cell constant The cell constant K shall be determined by means of the solution of known specific conductivity. Thoroughly rinse out and fill the cell with the solution. Adjust the temperature to 23 C 2 C, maintain at that value for 15 min and then measure the resistance R, in ohms,
32、at that temperature. Thoroughly rinse the cell with the deionized water used for the preparation of the potassium chloride solution. Fill the cell with the same deionized water and measure the resistance R 0 . The cell constant is then calculated as: K= 14,15 R 12 R R 0 6.4.2 Determination of conduc
33、tivity of blank Thoroughly rinse the cell with deionized water. Fill with the water obtained as a result of the blank extraction test (6.1) and measure its resistance R 1 in ohms. The conductivity of the blank b, in mS/m shall then be calculated as: b= K R 1Page 4 EN 12029 : 1996 BSI 1997 Figure 1.
34、Cells for determination of conductivity of water extractPage 5 EN 12029 : 1996 BSI 1997 6.4.3 Determination of conductivity of aqueous extract Thoroughly rinse the cell with the extract under test from 6.2 and then fill with this extract. Adjust the temperature to 23 C 2 C, maintain at that value fo
35、r 15 min and then measure the resistance R 2 in ohms, at that temperature. The conductivity of the aqueous extract in mS/m shall then be calculated as: a= 2b K R 2 7 Expression of results 7.1 The pH shall be expressed to the nearest 0,1. 7.2 The conductivity shall be expressed in mS/m at 23C. 8 Test
36、 report The test report shall include the following information: a) a reference to this European Standard; b) all information necessary to identify the test sample; c) the date of the test; d) the results obtained; e) any operation not specified in this European Standard, which may influence the res
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