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1、 Reference number ISO 7459:2004(E) ISO 2004 INTERNATIONAL STANDARD ISO 7459 Second edition 2004-03-01 Glass containers Thermal shock resistance and thermal shock endurance Test methods Rcipients en verre Rsistance au choc thermique et endurance au choc thermique Mthodes dessai ISO 7459:2004(E) PDF d
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5、l rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country
6、of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2004 All rights reserved ISO 7459:2004(E) ISO 2004 All rights reserved iii Foreword ISO (the International Org
7、anization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been establi
8、shed has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardizatio
9、n. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
10、Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such pat
11、ent rights. ISO 7459 was prepared by the European Committee for Standardization (CEN) in collaboration with Technical Committee ISO/TC 63, Glass containers, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement). Throughout the text of this document, read “.
12、this European Standard.“ to mean “.this International Standard.“. This second edition cancels and replaces the first edition (ISO 7459:1984), which has been technically revised. ISO 7459:2004(E) iv ISO 2004 All rights reserved Contents page Forewordv 1Scope 1 2Terms and definitions1 3Apparatus .1 3.
13、1Cold water bath1 3.2Hot water bath1 3.3Basket .1 4Sampling.1 5Procedure .2 6Thermal shock resistance.2 6.1Pass test .2 6.2Progressive test to a specified percentage of breakages .2 6.3Total progressive test2 6.4High-Ievel test.2 7Thermal shock endurance 2 8Safety requirements 3 9Test report 3 Bibli
14、ography5 -,-,- ISO 7459:2004(E) ISO 2004 All rights reserved v Foreword This document (EN ISO 7459:2004) has been prepared by Technical Committee CEN /TC 261, “Packaging“, the secretariat of which is held by AFNOR, in collaboration with Technical Committee ISO/TC 63 “Glass containers“. This European
15、 Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2004, and conflicting national standards shall be withdrawn at the latest by September 2004. This document includes a Bibliography. Efficient packaging
16、 is of great importance for the distribution and the protection of goods and the environment. Insufficient or inappropriate packaging can lead to damage or wastage of the contents of the pack. This standard is part of a series of standards for “Glass containers - Test methods“: EN ISO 7458, Glass co
17、ntainers Internal pressure resistance Test methods (ISO 7458:2004) EN ISO 7459, Glass containers Thermal shock resistance and thermal shock endurance Test methods (ISO:2004) prEN ISO 8106, Glass containers Determination of capacity by gravimetric method Test method (ISO/FDIS 8106:2003) EN ISO 8113,
18、Glass containers Resistance to vertical load Test method (ISO 8113:2004) EN 29008, Glass bottles Verticality Test method (ISO 9008:1991) EN 29009, Glass containers Height and non-parallelism of finish with reference to container base Test methods (ISO 9009:1991) EN 29885, Wide-mouth glass containers
19、 Deviation from flatness of top sealing surface Test methods (ISO 9885:1991) According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, F
20、inland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. -,-,- ISO 7459:2004(E) ISO 2004 All rights reserved 1 1 Scope This European Standard spec
21、ifies test methods for determining the thermal shock resistance and thermal shock endurance of glass containers. This European Standard does not apply to the determination of properties of laboratory glassware (see ISO 718). 2 Terms and definitions For the purposes of this European Standard, the fol
22、lowing terms and definitions apply. 2.1 container general term applied to glass bottles and jars 2.2 thermal shock sudden change in temperature applied to containers 2.3 thermal shock resistance thermal shock, measured in C , which a container can withstand without breaking 2.4 thermal shock enduran
23、ce interpolated thermal shock resistance value at which 50 % of the containers will probably fail 3 Apparatus 3.1 Cold water bath Comprising a bath or tank capable of containing at least 8 dm3 of water for each kilogram of glass tested at one time. lt shall be fitted with a water circulator, a contr
24、ol unit for temperature and a thermostatic control capable of maintaining the water temperature to within 1 C of a specified lower temperature, t2, within the range of (22 5) C (see NOTE to 6.3). 3.2 Hot water bath Comprising a bath or tank capable of containing at least 8 dm3 of water for each kilo
25、gram of glass being tested at one time. lt shall be fitted with a water circulator, a control unit for temperature and a thermostatically controlled heater capable of maintaining the water temperature to within 1 C of a specified upper temperature, t1. 3.3 Basket Basket made out of or coated with an
26、 inert material which will not damage the containers. The basket shall be capable of holding the containers upright and separate, and shall be fitted with a perforated lid to prevent the containers from floating when immersed. For the multiple testing of containers, it may be combined with an automa
27、tic device for immersing the basket of containers in the hot bath (3.2) and transferring it to the cold bath (3.1). 4 Sampling The test shall be performed on a predetermined number of containers. The containers used for the test shall not have been subjected to any other mechanical or thermal test p
28、rocedure -,-,- ISO 7459:2004(E) 2 ISO 2004 All rights reserved which could adversely affect their thermal shock resistance. The samples shall be selected to provide the information which is required from the particular test. 5 Procedure 5.1Fill the cold bath (3.1) with water to a volume equal to at
29、least 8 dm3 for each kilogram of glass to be tested and to a depth sufficient for complete immersion of the containers plus at least 50 mm. Adjust the water temperature to within 1 C of the specified lower temperature, t2. 5.2Fill the hot bath (3.2) with at least the same volume of water as in 5.1,
30、then heat and maintain the temperature to within 1 C of the specified upper temperature, t1. 5.3Place the empty containers in the basket (3.3) so that they are held upright and separate, then fasten the lid and immerse the basket in the hot bath, until the containers are completely filled with water
31、 and the tops of their finishes are at least 50 mm below the water level. If necessary, adjust the heat control to maintain the bath temperature to within 1 C of the specified upper temperature, t1, and keep the containers immersed at this temperature for at least 5 min. 5.4Transfer the basket with
32、the filled containers, either mechanically or manually, within max. 16 s, from the hot bath to the cold bath so that the containers are completely immersed. Keep the containers immersed for 30 s, then remove the basket and its contents from the cold bath. 5.5Determine as soon as possible the number
33、of containers which have failed the test, by inspecting each one for cracks or breakage. 6 Thermal shock resistance 6.1 Pass test A sample shall be deemed to have passed the test if no more than the agreed number are cracked or broken, after being subjected to an agreed thermal shock of t1 - t2. 6.2
34、 Progressive test to a specified percentage of breakages Containers which pass the test shall be repeatedly tested, as described in clause 5, but with increasing t1 - t2 values, until a specified percentage of the containers fail the test. NOTENormally, the difference between t2 and t1 is increased
35、in 5 C increments. 6.3 Total progressive test Containers which pass the test, described in clause 5, shall be tested in accordance with 6.2, until all the containers fail the test. NOTElf the test has not been concluded by the time the temperature of the hot water bath reaches 95 C, the test should
36、be continued by lowering the temperature of the cold water bath. 6.4 High-Ievel test Containers shall be tested in accordance with clause 5, but at a temperature difference, t1 - t2, sufficiently high to cause an agreed percentage to fail in a single test. 7 Thermal shock endurance The containers sh
37、all be tested in accordance with the total progressive test, described in 6.3, and the number of failures at each temperature difference shall be recorded. ISO 7459:2004(E) ISO 2004 All rights reserved 3 The thermal endurance, which is the probable temperature difference at which 50 % of the contain
38、ers would have failed, is determined from a graph of the cumulative percentage of failures against the temperature difference at which the containers failed. 8 Safety requirements This test procedure may be injurious to health if adequate precautions are not taken by the operator. Tests should be ca
39、rried out in a safe manner as recommended. 9 Test report The test report shall include the following: a) reference to this European Standard, b) number of containers in the sample tested and sampling method, c) temperature of the cold bath, d) test results: 1) for the pass test, in accordance with 6
40、.1: temperature difference, t1 - t2 number of containers which failed the test specification limit and whether the samples passed the test 2) for the progressive test, in accordance with 6.2: highest temperature difference, t1 - t2, at which no failure occurred number of containers which failed at e
41、ach temperature difference temperature difference needed to achieve the predetermined percentage of failures, expressed to the nearest increment step 3)for the total progressive test, in accordance with 6.3: temperature differences used in the test number of containers which failed at each temperatu
42、re difference mean temperature difference at which failure occurs 4)for the high-level test, in accordance with 6.4: temperature difference used in the test percentage of containers which failed at that temperature difference 5)for the thermal shock endurance test, in accordance with clause 7: tempe
43、rature difference at which 50 % of the sample would have failed. e)date of test -,-,- ISO 7459:2004(E) 4 ISO 2004 All rights reserved f)location g) signature of responsible person -,-,- ISO 7459:2004(E) ISO 2004 All rights reserved 5 Bibliography 1 ISO 718:1990, Laboratory glassware Thermal shock and thermal shock endurance Test methods. -,-,- ISO 7459:2004(E) ICS 55.100 Price based on 5 pages ISO 2004 All rights reserved