EN 17098-2-2018 Plastics - Barrier films for agricultural and horticultural soil disinfection by fumigation - Part 2 Method for film permeability determination .pdf

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1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Plastics - Barrier films for agricultural and horticultural soil disinfection by fumigationPart 2: Method for film permeability determination using a static techniqueBS EN 170982:2018National forewordThis British Standa

2、rd is the UK implementation of EN 170982:2018.The UK participation in its preparation was entrusted to Technical Committee PRI/75, Plastics and rubber film and sheets.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport t

3、o include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 95735 2ICS 83.140.10Compliance with a British Standard cannot confer immunity from legal obligations.

4、This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 170982:2018EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 170982January 2018ICS 83.140.10

5、EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2018 CEN Ref. No. EN 170982:2018: EAll rights of exploitation in any form and by any means reserved worldwide for CEN national MembersPla

6、stics Barrier films for agricultural and horticultural soil disinfection by fumigation Part 2: Method for film permeability determination using a static techniquePlastiques Films barrire pour la dsinfection par fumigation des sols agricoles et horticoles Partie 2: Mthode de dtermination de la permab

7、ilit dun film utilisant une technique statiqueKunststoffe Sperrschichtfolien zur Desinfektion durch Begasung von Landwirtschafts und Gartenbaubden Teil 2: Verfahren zur Bestimmung der Durchlssigkeit einer Folie unter Verwendung einer statischen TechnikThis European Standard was approved by CEN on 20

8、 November 2017.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Uptodate lists and bibliographical references concerning such national standards may be

9、obtained on application to the CENCENELEC Management Centre or to any CEN member.This European 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

10、CENCENELEC Management Centre has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland

11、, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.English VersionEN 17098-2:2018 (E)European forewordThis document (EN 170982:2018) has been prepared by Technical Committee

12、CEN/TC 249 “Plastics”, the secretariat of which is held by NBN.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 July 2018, and conflicting national standards shall be withdrawn at the latest by Jul

13、y 2018.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN not be held responsible for identifying any or all such patent rights.EN 17098, Plastics Barrier films for agricultural and horticultural soil disinfection by fumigation ,

14、 consists of the following parts: Part 1: Specifications for barrier films Part 2: Method for determining film permeability using a static technique According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European

15、 Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia,

16、 Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.2BS EN 170982:2018EN 17098-2:2018 (E)IntroductionThis test method is based on ASTM E294514, Standard Test Method for Film Permeability Determination Using Static Permeability Cells 1.The permeability of a thermoplastic film to a ga

17、seous composition depends on the nature of the film, the properties of the chemical constituents of the gaseous composition and environmental conditions. Various values can be used to characterize permeability to a gaseous composition, including flux, diffusion coefficient, and mass transfer coeffic

18、ient (MTC). Flux and diffusion coefficient depend on the concentration gradient across the film. However, it is recognized that mass transfer coefficient is independent of the concentration gradient and dependent only on the properties of the film and the chemical constituents of the gas, in additio

19、n to environmental conditions such as temperature and relative humidity on both sides of the film. It follows that mass transfer coefficient is an appropriate parameter to represent permeability to a specific gaseous composition.WARNING Users of this standard should be very familiar with standard la

20、boratory practice. This standard is not intended to cover any safety problems associated with its use, if applicable. It is the users responsibility to determine appropriate practices in terms of health and safety, and to ensure compliance with the applicable national regulatory requirements. 3BS EN

21、 170982:2018EN 17098-2:2018 (E)European foreword 2Introduction .3European foreword 5Introduction .61 Scope .72 Normative references 73 Terms and definitions .74 Principle 75 Apparatus and equipment 75.1 Transmission cell 75.2 Temperature controlled chamber. 85.3 Gas chromatograph . 85.4 VOCmeter . 8

22、6 Test specimens87 Conditioning and test atmosphere 97.1 Conditioning 97.2 Test atmosphere 98 Test gas .99 Procedure.910 Calculation and expression of results 1011 Acceptance criteria .1112 Precision 1213 Test report 12Bibliography .134Contents PageBS EN 170982:2018EN 17098-2:2018 (E)European forewo

23、rdThis document (EN 170982:2018) has been prepared by Technical Committee CEN/TC 249 “Plastics”, the secretariat of which is held by NBN.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 July 2018,

24、and conflicting national standards shall be withdrawn at the latest by July 2018.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN not be held responsible for identifying any or all such patent rights.EN 17098, Plastics Barrier

25、films for agricultural and horticultural soil disinfection by fumigation , consists of the following parts: Part 1: Specifications for barrier films Part 2: Method for determining film permeability using a static technique According to the CEN/CENELEC Internal Regulations, the national standards org

26、anizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg

27、, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.5BS EN 170982:2018EN 17098-2:2018 (E)IntroductionThis test method is based on ASTM E294514, Standard Test Method for Film Permeability Determination Using St

28、atic Permeability Cells 1.The permeability of a thermoplastic film to a gaseous composition depends on the nature of the film, the properties of the chemical constituents of the gaseous composition and environmental conditions. Various values can be used to characterize permeability to a gaseous com

29、position, including flux, diffusion coefficient, and mass transfer coefficient (MTC). Flux and diffusion coefficient depend on the concentration gradient across the film. However, it is recognized that mass transfer coefficient is independent of the concentration gradient and dependent only on the p

30、roperties of the film and the chemical constituents of the gas, in addition to environmental conditions such as temperature and relative humidity on both sides of the film. It follows that mass transfer coefficient is an appropriate parameter to represent permeability to a specific gaseous compositi

31、on.WARNING Users of this standard should be very familiar with standard laboratory practice. This standard is not intended to cover any safety problems associated with its use, if applicable. It is the users responsibility to determine appropriate practices in terms of health and safety, and to ensu

32、re compliance with the applicable national regulatory requirements. 6BS EN 170982:2018EN 17098-2:2018 (E)1 ScopeThis document specifies a method for determining the gas permeability of films using a static technique.This document is applicable to thermoplastic barrier films for agricultural and hort

33、icultural soil disinfection using the fumigation technique.2 Normative referencesThere are no normative references in this document.3 Terms and definitionsFor the purposes of this document, the following term and definition apply.ISO and IEC maintain terminological databases for use in standardizati

34、on at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp3.1permeabilityability of a material to transmit gases and liquids by passage through one surface and out at another surface by diffusion and sorp

35、tion processesSOURCE: EN ISO 472:2013 2, definition 2.6904 PrincipleA test specimen is placed in a gas transmission cell so as to form a sealed barrier between two chambers. A gas is introduced into one of the chambers (source chamber) to permeate into the other chamber (receiving chamber). The gas

36、concentrations in the source and receiving chambers are monitored over time by means of gas chromatography. The rate of variation in the concentrations is used to calculate the mass transfer coefficient.5 Apparatus and equipment5.1 Transmission cellThe transmission cell comprises a lower chamber (so

37、urce chamber) and upper chamber (receiving chamber). The inside diameter of each chamber ranges from 120 mm to 150 mm and the height from 40 mm to 60 mm. The chambers are constructed from a stainless steel cylinder and each cylinder is welded at one end to a flat stainless steel plate (see Figure 1)

38、. As an alternative, the chambers are made of glass, with the dimensions given above.In case of chambers made of glass, the exposure of the transmission cell to the direct sun light shall be avoided during testing.The lower and upper chambers shall each have a connection piece halfway up the chamber

39、, fitted with a septum or epoxy sealed valve for sampling purposes.The surfaces in contact with the specimen shall be smooth and flat so that gas leakage does not occur.Gas tightness between the two chambers shall be obtained either by means of a nitrile seal, or by attaching the film onto the two h

40、alfcells using epoxy glue.The volume of each chamber shall be measured.Aluminium adhesive tape may be applied on the outside of the cell to add to gas tightness.7BS EN 170982:2018EN 17098-2:2018 (E)The connection pieces are closed during the test and are used for injecting gas into the chambers and

41、for periodic sampling during the test.The cell shall include a device for measuring the relative humidity in each chamber.The chambers of the cell shall be cleaned after each test.Key1 source chamber2 receiving chamber3 test specimen4 valve or welded connection piece fitted with a septumFigure 1 Typ

42、ical example of a transmission cell5.2 Temperature controlled chamberA temperature controlled chamber is used to maintain a constant temperature in the transmission cell during the test.5.3 Gas chromatographVarious types of gas chromatography columns and detectors are available depending on the test

43、 gas.The column type shall be suited to the type of fumigant, and the type of film.The detector shall be suited to the type of fumigant.The precision of the detector and of the column should be taken into consideration in the choice of equipment to be used.The chromatograph shall be calibrated for t

44、he given fumigant within its concentration range.It is necessary to determine the limit of quantification (LOQ) for the fumigant being tested.Good laboratory practice should be followed as should the instructions for the gas chromatograph.5.4 VOC-meterA VOCmeter (volatile organic compoundmeter) is u

45、sed to detect the presence of leaks in the transmission cell.6 Test specimens6.1 Test specimens shall be representative of the film, free from wrinkles, folds and pinholes, and of uniform thickness. Test specimens shall be larger than the gas transmission area of the measurement cell 8 BS EN 170982:

46、2018EN 17098-2:2018 (E)and be capable of being mounted airtight. For a transmission cell with inside diameter 120 mm, cut the test specimens to approximately 150 mm 150 mm pieces.6.2 At least three test specimens shall be tested. The number of test specimens may be more than three if otherwise speci

47、fied or agreed upon by the interested parties.6.3 Mark the surface of the material in contact with the permeating gas.NOTE In principle, the test reproduces real application conditions.7 Conditioning and test atmosphere7.1 ConditioningUnless otherwise specified, the specimens shall be conditioned in

48、 the same conditions as the test atmosphere (see 7.2), at least 24 h before the start of the test.Unless otherwise specified, the cell shall be conditioned in the same conditions as the test atmosphere (see 7.2), at least 24 h before the start of the test.7.2 Test atmosphereUnless otherwise specifie

49、d, the test shall be carried out in at least one of the following test conditions: Condition 1: Test temperature: (25 2) C and (95 5) % RH; Condition 2: Test temperature: (25 2) C and (50 10) % RH.Other test conditions, for example test conditions specified in EN ISO 291 3, may be chosen by agreement between the interested parties.8 Test gasThe test gas should be chosen from the following list: 1,3Dichloropropene (CAS number: 542756); Dimethyl disulphide (DMDS) (CAS number: 624920); Me