1、BRITISH STANDARD BS ISO 15592-2:2001 Fine-cut tobacco and smoking articles made from it Methods of sampling, conditioning and analysis Part 2: Atmosphere for conditioning and testing ICS 65.160 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS ISO 15592-2:2001 This British Sta
2、ndard, having been prepared under the direction of the Consumer Products and Services Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 June 2001 BSI 06-2001 ISBN 0 580 37591 9 National foreword This British Standard reproduces verbatim ISO 15
3、592-2:2001 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee AW/40, Tobacco and tobacco products, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secreta
4、ry. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Ca
5、talogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the
6、text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front
7、cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 5, and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsReference number ISO 15592-2:2001(E) INTERNATIONA
8、L STANDARD ISO 15592-2 First edition 2001-03-15 Fine-cut tobacco and smoking articles made from it Methods of sampling, conditioning and analysis Part 2: Atmosphere for conditioning and testing Tabac de fine coupe et objets confectionns partir de ce type de tabac Mthodes dchantillonnage, de conditio
9、nnement et danalyse Partie 2: Atmosphre de conditionnement et dessaiISO 15592-2:2001(E) ii ISO 15592-2:2001(E)iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standard
10、s is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take
11、part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by t
12、he technical committees are circulated to the member bodies for voting. 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 part of ISO 15592 may be the subject of pat
13、ent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 15592-2 was prepared by Technical Committee ISO/TC 126, Tobacco and tobacco products. ISO 15592 consists of the following parts, under the general title Fine-cut tobacco and smokin
14、g articles made from it Methods of sampling, conditioning and analysis: Part 1: Sampling Part 2: Atmosphere for conditioning and testing Part 3: Determination of total particulate matter of smoking articles using a routine analytical smoking machine, preparation for the determination of water and ni
15、cotine and calculation of nicotine-free dry particulate matter Part 4: Classification of wrappers Part 5: Fine-cut tobacco to be used with specified wrappers Part 6: Effect of incorporation of loose filters Annex A of this part of ISO 15592 is for information only.ISO 15592-2:2001(E) iv Introduction
16、 ISO 3402 was based on the 1991 revision of CORESTA Recommended Method No. 21 and was produced in order to specify a standard atmosphere for conditioning leaf tobacco, and cut tobacco destined for the manufacture of cigarettes and for the manufactured cigarettes themselves. Fine-cut tobacco is produ
17、ced and sold at much higher moisture levels than tobacco used for manufacturing cigarettes. Consequently ISO 3402 is not applicable to fine-cut tobacco or smoking articles made from it. This part of ISO 15592 is based on a new CORESTA Recommended Method No. 42 and should be used for all products con
18、forming to the definitions in clause 2.INTERNATIONAL STANDARD ISO 15592-2:2001(E)1 Fine-cut tobacco and smoking articles made from it Methods of sampling, conditioning and analysis Part 2: Atmosphere for conditioning and testing 1 Scope This part of ISO 15592 specifies an atmosphere for conditioning
19、 and testing samples of fine-cut tobacco and test pieces made from it. It is applicable to tests on fine-cut tobacco and products and materials used in the manufacture of fine-cut smoking articles for which a prior conditioning is necessary. It is not applicable in the case of test methods for which
20、 particular test conditions are laid down elsewhere, for example cigarette papers and board, which are given in ISO 187 or other tobacco products which are given in ISO 3402. 2 Terms and definitions For the purposes of this part of ISO 15592, the following terms and definitions apply. 2.1 atmosphere
21、 ambient conditions defined by one or more of the following parameters: temperature relative humidity pressure ISO 558:1980, definition 2.1 2.2 conditioning atmosphere atmosphere in which a sample or test piece is kept before being subjected to test NOTE 1 It is characterized by specified values for
22、 one or more of the following parameters: temperature, relative humidity and pressure, which are kept within the prescribed tolerances for a given period of time. NOTE 2 The term “conditioning“ refers to the operation as a whole designed to bring a sample or test piece, before testing, into a specif
23、ied condition with relation to temperature and humidity, by keeping it for a given period of time in the conditioning atmosphere. NOTE 3 The conditioning may be carried out either in the laboratory or in a special enclosure termed the “conditioning chamber“ or in the test chamber. NOTE 4 The chosen
24、values and period of time depend on the nature of the sample or test piece to be tested. NOTE 5 Adapted from ISO 558:1980, definition 2.2.ISO 15592-2:2001(E) 2 2.3 test atmosphere atmosphere to which a sample or test piece is exposed throughout the test NOTE 1 It is characterized by specified values
25、 for one or more of the following parameters: temperature, relative humidity and pressure, which are kept within the prescribed tolerances. NOTE 2 The test may be carried out either in the laboratory or in a special chamber termed the “test chamber“ or in the conditioning chamber, the choice dependi
26、ng on the nature of the test piece and on the test itself. For example, close control of the test atmosphere may not be necessary if the change of properties of the test piece is insignificant in the test period. NOTE 3 Adapted from ISO 558:1980, definition 2.3. 2.4 fine-cut tobacco FCT tobacco prod
27、uced to be used by consumers for making their own smoking articles 2.5 wrapper material specially prepared and supplied in a form suitable for enclosing fine-cut tobacco so as to produce a fine- cut smoking article 2.6 fine-cut smoking article FCSA article, suitable for smoking, produced by combinin
28、g fine-cut tobacco with a wrapper 3 Atmosphere 3.1 Conditioning atmosphere This shall be as follows: temperature (22 2) C; relative humidity (75 3) %. The atmospheric pressure should be within the range 86 kPa to 106 kPa. The pressure shall be measured and included in any test report if it is outsid
29、e these prescribed tolerances. The specified ranges listed above define the atmosphere immediately surrounding the test piece. Therefore, the atmosphere surrounding the test piece shall be maintained at a mean temperature of 22 C and a mean relative humidity of 75 %. NOTE 1 The tolerance on relative
30、 humidity is given as 3 %. This differs from the tolerance given in ISO 3402 which is 2 %. This is due to the higher relative humidity which is more difficult to control. NOTE 2 Whilst monitoring equipment might indicate the relative humidity is within the (75 3) % specification, this tolerance can
31、be comparable with the uncertainty in calibration of the equipment. Care should be taken to check the electronic control of humidity and the conditions in the cabinet should be checked regularly (see A.3). 3.2 Test atmosphere This shall be as follows: temperature (22 2) C; relative humidity (60 5) %
32、.ISO 15592-2:2001(E)3 4 Conditioning 4.1 Duration of conditioning A duration of 72 h is generally found to be sufficient for fine-cut tobacco and fine-cut smoking articles, using a forced air flow. Samples shall not be kept in the conditioning cabinet for longer than 10 days. The duration of conditi
33、oning (conditioning of tobacco prior to making the FCSAs and the subsequent conditioning time of the FCSAs) shall be limited to a period of 3 to 10 days to ensure proper equilibrium, as well as avoiding loss of volatile compounds. If, for any reason, test samples are to be kept for longer than 10 da
34、ys, they shall be stored in the original packaging or in airtight containers just large enough to contain the sample. A conditioning time of 72 h can be insufficient for certain samples or test pieces, for example when smoking articles are conditioned without forced air flow. Therefore, in all cases
35、, it should be verified that equilibrium has been properly attained (see 4.3). If it is anticipated that the tobacco, or the fine-cut smoking articles, are to be kept for longer than 3 months, it is recommended that they be placed in sealed containers, frozen and stored at approximately 16 C until n
36、eeded. 4.2 Method of storage in the conditioning cabinet For fine-cut tobacco, the tobacco layer depth shall be restricted to 20 mm to ensure proper conditioning. This depth shall be achieved without external pressure being applied to the tobacco. In the case of tobacco removed from a sample pouch d
37、estined for the market, it is necessary to tease the sample apart in order to ensure adequate exposure for conditioning. NOTE Fine-cut smoking tobacco is also sold in packaging forms other than pouches but throughout this part of ISO 15592 the unit of sale is referred to as a pouch. The same princip
38、les of handling and conditioning apply to tobacco from all forms of packaging. Fine-cut smoking articles shall be conditioned by storing them in the cabinet on a tray in a single layer. If a device is constructed to hold more than one tray it shall be constructed such as to allow air to pass freely
39、over all fine-cut smoking articles in the device and the distance above each layer of fine-cut smoking articles shall be at least 8 mm. In both cases, the trays used shall be perforated to allow circulation of conditioned air. 4.3 Checking of equilibrium It is recommended that the atmospheric relati
40、ve humidity near the samples or test pieces be verified by the use of a hygrometer calibrated with traceable standards (see, for example, ISO 4677-1). Equilibrium shall be considered to have been attained either a) when the relative variation of the mass of the sample or test pieces is not greater t
41、han 0,2 % in 3 h, or b) when the sample or the test pieces, placed in a closed container of a volume similar to that of the sample or the test pieces, give(s) rise to a relative humidity in the container equal to that of the conditioning atmosphere. NOTE Suitable apparatus for the measurement of rel
42、ative humidity in the container is available from Rotronic and Novasina. 1) 1) This information is given for the convenience of users of this part of ISO 15592 and does not constitute an endorsement by ISO of this equipment. Equivalent equipment may be used if it can be shown to lead to the same res
43、ults.ISO 15592-2:2001(E) 4 Annex A (informative) Method of conditioning when electronically controlled cabinets are not available A.1 Introduction In laboratories not equipped with any means of controlling the conditioning atmosphere electronically, it is possible to condition the samples in a seale
44、d cabinet containing a saturated salt solution, preferably with a low flow, forced air circulation. A.2 Method A.2.1 Making the salt solution The saturated salt solution should be made up into a slurry with sodium chloride (general-purpose reagent) in water, such that the amount of sodium chloride d
45、oes not all dissolve and a significant excess of the sodium chloride exists in the slurry. A.2.2 Use in the cabinet The amount to be used will depend on the size of the cabinet. The salt solution should be kept in a tray having shallow sides and with an area large enough to cover most of the bottom
46、of the cabinet. The tray should be placed in the cabinet in such a way that a low air flow is forced over the salt solution. A dish should not be used as the sides may interfere with the natural air flow and prevent proper conditioning of the atmosphere. A.3 Validation of conditioning atmosphere In
47、order to ensure proper conditioning, it is necessary to validate the conditioning atmosphere. Validate the temperature by using a thermometer calibrated with a traceable standard. Various means of testing relative humidity exist. In practice, in a small enclosure, their use can be inconvenient or th
48、eir calibration can be difficult to demonstrate. The mass of tobacco is very sensitive to conditioning (especially humidity). If an atmosphere, validated against a traceable standard, is available, the mass of tobacco can be used as a secondary standard. This offers a very simple control procedure.
49、In practice, this procedure involves placing small samples (approximately 10 g) of fine-cut tobacco in shallow trays just large enough to hold the sample. Several (at least four) trays should be distributed throughout the cabinet. The mass of tobacco, including the tray, should be checked at least daily. Control charts should be constructed to indicate the mean mass of each sample and tolerance boundaries of 0,2 %. In this way any systematic or random deviation from the mean for any one position in the cabinet will
