SIST EN 13206:2017
(Main)Plastics - Thermoplastic covering films for use in agriculture and horticulture - Requirements and test methods, conditions for installation, use and removal
Plastics - Thermoplastic covering films for use in agriculture and horticulture - Requirements and test methods, conditions for installation, use and removal
This European Standard specifies the requirements related to dimensional, mechanical, optical and
thermal characteristics of thermoplastic films used for covering permanent or temporary greenhouses
and walking tunnels and low tunnels used for forcing and semi-forcing vegetable, fruit and flower crops.
Lay-flat perforated cover films are also in the scope of this European Standard.
It specifies a classification for the durability of covering films and the test methods referred to in this
standard.
This European Standard specifies also test methods for the determination of the chlorine and sulfur
contents of films subjected to use.
This European Standard is applicable to thermoplastic covering films used in agriculture and
horticulture in Europe, in the thickness range 20 μm up to more than 250 μm, based on polyethylene
and/or ethylene copolymers materials, of the following types: non-thermal films, thermal clear films
and thermal diffusing films.
This European Standard also defines guidance for installation, use and disposal of covering films. It
defines the conventional expected lifetime, as well as rules that allow evaluating the remaining use
potential in the event of a failure before the normal end-of-use date.
NOTE These rules allow estimating the residual value of the films. These provisions only apply to the film
itself and the damage it has undergone. Any other problem falls within the scope of professional practices and the
general terms and conditions of sale.
Kunststoffe - Thermoplastische Abdeckfolien für den Einsatz in der Landwirtschaft und im Gartenbau - Anforderungen und Prüfverfahren, Bedingungen für den Einsatz, die Anwendung und das Ablegen
Plastiques - Films de couverture thermoplastiques pour utilisation en agriculture et horticulture - Exigences et méthodes d'essai, conditions de mise en œuvre, d'utilisation et de dépose
Polimerni materiali - Prekrivne plastomerne folije za uporabo v kmetijstvu in vrtnarstvu - Zahteve in preskusne metode, pogoji za namestitev, uporabo in odstranjevanje
Ta evropski standard določa zahteve v zvezi z dimenzionalnimi, mehanskimi, optičnimi in toplotnimi lastnostmi plastomernih folij za prekrivanje stalnih ali začasnih rastlinjakov in nizkih tunelov ter zastirk, ki se uporabljajo za pospeševanje rasti in klitje zelenjave, sadja ter cvetja.
Ta evropski standard zajema tudi plosko ležeče prekrivne folije.
Določa razvrstitev za trajnost prekrivnih folij in preskusne metode iz tega standarda.
Ta evropski standard določa tudi preskusne metode za določanje vsebnosti klora in žvepla v folijah, ki so predmet uporabe.
Ta evropski standard se uporablja za plastomerne prekrivne folije za uporabo v kmetijstvu in vrtnarstvu v Evropi z razponom debeline od 20 μm do več kot 250 μm na osnovi polietilenskih in/ali etilenskih kopolimernih materialov naslednjih vrst: atermične folije, termične prosojne folije in termične difuzne folije.
Ta evropski standard določa tudi smernice za namestitev, uporabo in odlaganje prekrivnih folij. Opredeljuje običajno pričakovano življenjsko dobo in pravila za ocenjevanje preostalih možnosti uporabe v primeru poškodbe pred običajnim datumom konca uporabe.
OPOMBA: Ta pravila omogočajo ocenitev preostale vrednosti folij. Te določbe se uporabljajo le za folijo
in njene poškodbe. Morebitne druge težave spadajo na področje strokovnih praks ter splošnih pogojev in določil za prodajo.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Polimerni materiali - Prekrivne plastomerne folije za uporabo v kmetijstvu in vrtnarstvu - Zahteve in preskusne metode, pogoji za namestitev, uporabo in odstranjevanjeKunststoffe - Thermoplastische Abdeckfolien für den Einsatz in der Landwirtschaft und im Gartenbau - Anforderungen und Prüfverfahren, Bedingungen für den Einsatz, die Anwendung und das AblegenPlastiques - Films de couverture thermoplastiques pour utilisation en agriculture et horticulture - Exigences et méthodes d'essai, conditions de mise en œuvre, d'utilisation et de déposePlastics - Thermoplastic covering films for use in agriculture and horticulture - Requirements and test methods, conditions for installation, use and removal83.140.10Filmi in folijeFilms and sheets65.040.30Rastlinjaki in druge napraveGreenhouses and other installationsICS:Ta slovenski standard je istoveten z:EN 13206:2017SIST EN 13206:2017en,fr,de01-april-2017SIST EN 13206:2017SLOVENSKI
STANDARDSIST EN 13206:20021DGRPHãþD
SIST EN 13206:2017
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13206
January
t r s y ICS
x wä r v rä u râ
z uä s v rä s r Supersedes EN
s u t r xã t r r sEnglish Version
Plastics æ Thermoplastic covering films for use in agriculture and horticulture Plastiques æ Films de couverture thermoplastiques pour utilisation en agriculture et horticulture
Kunststoffe æ Thermoplastische Abdeckfolien für den Einsatz in der Landwirtschaft und im Gartenbau This European Standard was approved by CEN on
s v November
t r s xä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
9
t r s y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s u t r xã t r s y ESIST EN 13206:2017
EN 13206:2017 (E) 2 Contents Page
European foreword . 4 1 Scope . 5 2 Normative references. 5 3 Terms and definitions . 6 4 Types and use . 7 5 Material . 8 6 Durability . 8 7 Requirements . 9 8 Test methods . 12 9 Film acceptance, storage and handling . 18 10 Designation . 18 11 Marking . 19 12 Instructions for installation, use of covering films . 19 13 Instructions for disposal and end-of-life of covering films . 19 Annex A (informative)
Exposure to other light sources . 20 A.1 Medium pressure mercury vapour lamps . 20 A.2 Fluorescent uv lamps . 22 Annex B (informative)
Empirical correlation between durations of covering films exposed to artificial weathering and a natural exposure. 24 B.1 Exposure to xenon-arc lamps . 24 B.2 Exposure to medium pressure mercury vapour lamps . 27 B.3 Exposure to fluorescent uv lamps . 27 Annex C (normative)
Determination of the chlorine content by coulometry . 28 C.1 Principle . 28 C.2 Apparatus and reagents . 28 C.3 Test procedure . 28 C.4 Calculation and expression of the results . 30 C.5 Test report . 30 C.6 Precision . 31 C.7 Determination of chlorine in the presence of
benzotriazole . 31 Annex D (normative)
Determination of the sulfur content by icp- oes technique . 32 D.1 Scope . 32 SIST EN 13206:2017
EN 13206:2017 (E) 3 D.2 Instruments and reagents. 32 D.3 Method of analysis . 32 D.4 References
preparation and calibration . 33 D.5 Sample preparation (digestion) . 34 D.6 Sulfur measurement . 34 D.7 Expression of results . 34 D.8 Sulfur determination in case of presence of ni quenchers . 34 D.9 Examples of conditions . 34 Annex E (informative)
Alternative method for the determination of chlorine and sulfur contents by x-ray fluorescence . 36 E.1 Principle . 36 E.2 Introduction . 36 E.3 Apparatus . 36 E.4 Test procedure . 36 E.5 Calculation and expression of the result . 36 E.6 Test report . 37 Annex F (informative)
Alternative methods for the determination of sulfur content by ultraviolet fluorescence method or by coulometry . 38 F.1 Principle . 38 F.2 Ultraviolet fluorescence method . 38 F.3 Coulometry . 40 Annex G (informative)
Guidance for installation, use and disposal of covering films . 43 G.1 Greenhouse covering films . 43 G.2 Low tunnel covering films. 49 G.3 Removal instructions . 50 Annex H (informative)
Industrial standard formats of films . 51 Bibliography . 52
SIST EN 13206:2017
EN 13206:2017 (E) 4 European foreword This document (EN 13206:2017) has been prepared by Technical Committee CEN/TC 249 “Plastics”, the secretariat of which is held by NBN. This document supersedes EN 13206:2001. 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 2017, and conflicting national standards shall be withdrawn at the latest by July 2017. The following technical changes have been made in comparison to EN 13206:2001:
— a minimum thickness of the film is fixed;
— the test methods have been updated as appropriate; — this revision specifies also test methods for the determination of the chlorine and sulfur contents of the films subjected to use and defines guidelines for installation, use and disposal; — the classification for the durability of the covering films is extended to a further class. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations 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, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 13206:2017
EN 13206:2017 (E) 5 1 Scope This European Standard specifies the requirements related to dimensional, mechanical, optical and thermal characteristics of thermoplastic films used for covering permanent or temporary greenhouses and walking tunnels and low tunnels used for forcing and semi-forcing vegetable, fruit and flower crops. Lay-flat perforated cover films are also in the scope of this European Standard. It specifies a classification for the durability of covering films and the test methods referred to in this standard. This European Standard specifies also test methods for the determination of the chlorine and sulfur contents of films subjected to use. This European Standard is applicable to thermoplastic covering films used in agriculture and horticulture in Europe, in the thickness range 20 µm up to more than 250 µm, based on polyethylene and/or ethylene copolymers materials, of the following types: non-thermal films, thermal clear films and thermal diffusing films. This European Standard also defines guidance for installation, use and disposal of covering films. It defines the conventional expected lifetime, as well as rules that allow evaluating the remaining use potential in the event of a failure before the normal end-of-use date. NOTE These rules allow estimating the residual value of the films. These provisions only apply to the film itself and the damage it has undergone. Any other problem falls within the scope of professional practices and the general terms and conditions of sale. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 10244-2, Steel wire and wire products - Non-ferrous metallic coatings on steel wire - Part 2: Zinc or zinc alloy coatings EN 13031-1, Greenhouses - Design and construction - Part 1: Commercial production greenhouses EN 16472, Plastics - Method for artificial accelerated photoageing using medium pressure mercury vapour lamps EN ISO 527-1, Plastics - Determination of tensile properties - Part 1: General principles (ISO 527-1) EN ISO 527-3, Plastics - Determination of tensile properties - Part 3: Test conditions for films and sheets (ISO 527-3) EN ISO 4892-2:2013, Plastics - Methods of exposure to laboratory light sources - Part 2: Xenon-arc lamps (ISO 4892-2:2013) EN ISO 4892-3:2016, Plastics - Methods of exposure to laboratory light sources - Part 3: Fluorescent UV lamps (ISO 4892-3) EN ISO 7765-1:2004, Plastics film and sheeting - Determination of impact resistance by the free-falling dart method - Part 1: Staircase methods (ISO 7765-1:1988) ISO 4591, Plastics — Film and sheeting — Determination of average thickness of a sample, and average thickness and yield of a roll, by gravimetric techniques (gravimetric thickness) SIST EN 13206:2017
EN 13206:2017 (E) 6 ISO 4592, Plastics — Film and sheeting — Determination of length and width ISO 4593, Plastics — Film and sheeting — Determination of thickness by mechanical scanning ASTM D 1003-13, Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 width overall width of a film when laid flat Note 1 to entry: It is expressed in millimetres. 3.2 nominal width width of a film, as declared by the manufacturer/supplier Note 1 to entry: It is expressed in millimetres. 3.3 nominal thickness thickness of a film, as declared by the manufacturer/supplier Note 1 to ent 3.4 roll length largest dimension of the film corresponding to the length of the unwinded roll Note 1 to entry: It is expressed in metres. 3.5 nominal length length of a film roll or sheet, as declared by the manufacturer/supplier Note 1 to entry: It is expressed in metres. 3.6 nominal mass mass of a roll or sheet, as declared by the manufacturer/supplier Note 1 to entry: It is expressed in kilograms. 3.7 longitudinal direction MD direction parallel to the roll length, corresponding to the extrusion direction 3.8 transverse direction TD direction parallel to the width (at right angle to the length) SIST EN 13206:2017
EN 13206:2017 (E) 7 3.9 conventional
expected lifetime expected lifetime defined by agreement between the manufacturer/supplier and the customer or, by default, the minimum use duration that the film needs to satisfy Note 1 to entry: It is expressed in years, months or seasons. 3.10 actual useful lifetime time interval defined as beginning from the installation date of a film until its removal or an earlier date in case of its failure Note 1 to entry: It is expressed in months, years or seasons. 3.11 use ratio ratio of the actual useful lifetime of a film to its conventional expected lifetime Note 1 to entry: It is expressed as a dimensionless ratio or as a percentage (%). 3.12 remaining use potential difference between the conventional expected lifetime of a film and its actual useful lifetime Note 1 to entry: It is expressed in months. 3.13 radiant exposure H time integral of irradiance, measured in joules per square metre (J/m2) [SOURCE: ISO 9370:2009 [1], definition 3.27] 4 Types and use The different types of covering films, their optical and thermal characteristics and use are given in Table 1. Table 1 — Characteristics and use of covering films Type Optical and thermal characteristics Use Non-thermal (NTh) Low IR effectiveness Forcing and semi forcing crops Thermal clear (ThC) High transparency High IR effectiveness Same use as normal film, when higher IR effectiveness is requested Thermal diffusing (ThD) Diffusing light High IR effectiveness Same use as normal film, when higher IR effectiveness and diffusing light effect are requested SIST EN 13206:2017
EN 13206:2017 (E) 8 5 Material Covering films according to this standard are usually manufactured from: — low density polyethylene (PE-LD), linear low density polyethylene (PE-LLD) and their blends; — ethylene vinyl acetate copolymers (EVAC) and their blends with PE-LD or PE-LLD; — ethylene butyl acrylate copolymers (EBA) and their blends with PE-LD or PE-LLD. 6 Durability The durability of covering films is characterized by the class N, A, B, C, D, E or F. This classification, given in Table 2, is depending on the duration of exposure of the film to an artificial weathering using xenon-arc lamps according to 8.9, which induces a decrease of the value of tensile strain at break equal or less than 50 % of the initial value. The class of durability shall be declared by the manufacturer. Table 2 — Resistance to weathering classification Class Minimum duration of exposure h At irradiance (narrowband – 420 nm) 0,35 W/(m2„nm) At irradiance (narrowband – 420 nm) 0,51 W/(m2„nm) N 400 280 A 2 000 1400 B 3 500 2450 C 5 400 4070 D 6 800 4670 E 8 500 5830 F 10 700 7350 For films intended to be used outside of Europe, longer durations of exposures than this for Class F can be required. In this case, the minimum duration of exposure shall be defined by agreement between the manufacturer/supplier and the customer. Other light sources may be used provided that a correlation between the test results obtained with these light sources and these obtained after a natural exposure can be demonstrated. This may be useful when the durations of the exposure to xenon-arc lamps as defined in Table 2 are too long. Details of these methods are given in Annex A (informative). In case of dispute, the exposure to xenon-arc lamps according to 8.9 and the classification according to Table 2 shall be used. NOTE An empirical correlation between durability of covering films for greenhouses exposed to artificial weathering and natural exposure is given in Annex B (informative). The correlation study has been performed at an irradiance in narrow band (420 nm) equal to 0,35 W/(m2„nm) SIST EN 13206:2017
EN 13206:2017 (E) 9 7 Requirements 7.1 General requirements Non-thermal films, thermal clear films and thermal diffusing films shall fulfil the requirements of Tables 3 to 5, respectively. Table 3 — Requirements for non-thermal films Characteristics Unit Nominal thickness Test method Subclause
· 20 a
· 60 b
· 100 c
· 150 d
· 200 Appearance - Shall conform to 7.2 7.2 Dimensional characteristics Tolerance of average thickness/nominal thickness % ±5 8.1 Tolerance of single point thickness/nominal thickness % - 15, +25 8.1 Width tolerance/nominal width Flat film Tubular film % % 0, +4 0, +2,4 8.2 Tolerance roll length/nominal length % 0, +4 8.12 Mechanical characteristics on unexposed film Tensile stress at break (MD, TD) MPa
· 19 8.3 Tensile strain at break (MD, TD) %
· 250
· 300
· 350
· 400
· 450 8.3 Impact resistance
Flat area g
· 100
· 150
· 300
· 350
· 450 8.4.2 Fold area g
· 75
· 100
· 150
· 200
· 250 8.4.3 Optical characteristic on unexposed film Visible light
transmission %
· 90
· 88
· 88
· 85
· 85 8.6 a 20
¶ nominal thickness < 60
b 60
¶ nominal thickness < 100
c 100
¶ nominal thickness < 150
d 150
¶ nominal thickness < 200
SIST EN 13206:2017
EN 13206:2017 (E) 10 Table 4 — Requirements for thermal clear films Characteristics Unit Nominal thickness Test method Subclause
· 25 a
· 60 b
· 100 c
· 150 d
· 200 Appearance - Shall conform to 7.2 7.2 Dimensional characteristics Tolerance of average thickness/nominal thickness % ±5 8.1 Tolerance of single point thickness/nominal thickness % - 15, +25 8.1 Width tolerance/nominal width Flat film Tubular film % % 0, +4 0, +2,4 8.2 Tolerance roll length/nominal length % 0, +4 8.12 Mechanical characteristics on unexposed film Tensile stress at break (MD, TD) MPa
· 20 8.3 Tensile strain at break (MD, TD) %
· 300
· 350
· 400
· 450
· 550 8.3 Impact resistance
Flat area g
· 150
· 250
· 350
· 500
· 650 8.4.2 Fold area g
· 75
· 100
· 200
· 350
· 400 8.4.3 Elongation under a steady load (MD) %
¶ 30
¶ 30
¶ 30
¶ 30
¶ 30 8.5 Optical characteristic on unexposed film Visible light
transmission %
· 92
· 90
· 90
· 88
· 88 8.6 Haze %
¶ 20
¶ 25
¶ 25
¶ 30
¶ 30 8.7 IR effectiveness %
· 40
· 50
· 55
· 65
· 75 8.8 a 25
¶ nominal thickness < 60
b 60
¶ nominal thickness < 100
c 100
¶ nominal thickness < 150
d 150
¶ nominal thickness < 200
SIST EN 13206:2017
EN 13206:2017 (E) 11 Table 5 — Requirements for thermal diffusing films Characteristics Unit Nominal thickness Test method Subclause
· 25 a
· 60 b
· 100 c
· 150 d
· 200 Appearance - Shall conform to 7.2 7.2 Dimensional characteristics Tolerance of average thickness/nominal thickness % ±5 8.1 Tolerance of single point thickness/nominal thickness % - 15, +25 8.1 Width tolerance/nominal width Flat film Tubular film % % 0, +4 0, +2,4 8.2 Tolerance roll length/nominal length % 0, +4 8.12 Mechanical characteristics on unexposed film Tensile stress at break (MD, TD) MPa
· 20 8.3 Tensile strain at break (MD, TD) %
· 200
· 220
· 350
· 400
· 500 8.3 Impact resistance
Flat area g
· 100
· 160
· 300
· 400
· 500 8.4.2 Fold area g
· 75
· 110
· 200
· 250
· 350 8.4.3 Elongation under a steady load (MD) %
¶ 30
¶ 30
¶ 30
¶ 30
¶ 30 8.5 Optical characteristic on unexposed film Visible light
transmission %
· 88
· 85
· 85
· 80
· 80 8.6 Haze %
· 30
· 30
· 30
· 35
· 35 8.7 IR effectiveness %
· 40
· 55
· 60
· 70
· 75 8.8 a 25
¶ nominal thickness < 60
b 60
¶ nominal thickness < 100
c 100
¶ nominal thickness < 150
d 150
¶ nominal thickness < 200
7.2 Requirement for appearance The free edges of the roll shall be sealed with adhesive tape or by some other similar means, in order to prevent its unwinding. The edges shall be properly in line and there shall be sufficient tension to prevent the layers of the roll from transverse slipping when it is handled. The film shall be homogeneous and free from visible defects which may affect the fitness for purpose of the film; check by unrolling at least 2 m of the film and examining it against the light holding it tight at arms length. SIST EN 13206:2017
EN 13206:2017 (E) 12 8 Test methods 8.1 Determination of thickness The thickness of single points of the film shall be determined in accordance with ISO 4593. The average thickness of the film shall be determined in accordance with ISO 4591 or ISO 4593. Testing shall be performed using one strip of film cut in transverse direction of the roll (TD). 8.2 Determination of width The width of the film shall be determined in accordance with ISO 4592. 8.3 Determination of tensile characteristics The tensile characteristics shall be determined according to EN ISO 527-1 and EN ISO 527-3 using five test pieces type 2, with a width of 10 mm, cut in each direction of the film, longitudinal direction (MD) and transversal direction (TD), at a testing speed of 500 mm/min. Calculate the arithmetic average value of the five measurements. The arithmetic average value shall fulfil the requirements of Tables 3 to 5, as applicable. 8.4 Determination of impact resistance 8.4.1 General NOTE Films which are wider than 2 000 mm are usually folded lengthwise at least once before winding on a reel. These folds are retained even when the film is laid out flat, and this may affect test results. In case of a folded film, a distinction shall be made between the test pieces taken from the folds (fold area) and sample sheets taken from areas which have not been folded (flat area). 8.4.2 Flat area The impact resistance (Dart drop test) in flat area shall be determined in accordance with EN ISO 7765-1:2004, method A. Calculate the impact failure mass mf, in grams, in accordance with EN ISO 7765-1. The impact failure mass mf shall fulfil the requirements of Tables 3 to 5, as applicable. 8.4.3 Fold area The impact resistance (Dart drop test) in fold area shall be determined using the apparatus specified in EN ISO 7765-1:2004, method A. Spread out the film with the marked face onto the apparatus and test every folds tangentially twice, alternately internal and external folds, with a mass as specified in Tables 3, 4, 5, as applicable. The tangential test is obtained by shifting forward the fold of 13 mm from the vertical axle of the specimen clamp. See Figure 1. If no failure occurs, the result is declared “pass”. If one failure occurs, carry out two additional tests on the fold which failed in the same position (internal or external fold). Then, if no failure occurs, the result is declared “pass” and if one or two failure(s) occur(s), the result is declared “fail”. If two failures occur, the result is declared “fail”. SIST EN 13206:2017
EN 13206:2017 (E) 13
Key 1 external fold 2 internal fold 3 film 4 vertical axle of the specimen clamps where: d = 13 mm Figure 1 — Position of impact on folds 8.5 Determination of elongation under a steady load (creep test) 8.5.1 Principle This test method is intended to measure the creep, expressed as the elongation of the film under a steady load in a vertical static position after a specified time period. 8.5.2 Apparatus A typical arrangement for testing is shown in Figure 2. The test piece is hold by two grips, the upper grip is clamped to a fixed support and a weight is hung to the lower grip to provide a steady load on the test piece. SIST EN 13206:2017
EN 13206:2017 (E) 14
Key 1 Fixed support 2 Grips 3 test piece 4 Mass Figure 2 — Typical apparatus 8.5.3 Test pieces Cut three test pieces from the film in the longitudinal direction (MD), with the following dimensions: — width: 10 mm; — overall length: 140 mm; Gauge marks are defined on each test piece. The distance between the marks (L0) shall be 100 mm. 8.5.4 Test conditions a) Test temperature: 23 °C ± 2 °C. b) Stress to be applied: 4 MPa. c) Test period: 100 h. 8.5.5 Test procedure For each test piece, measure the thickness and the minimum width and calculate the value of the steady load referring to the measured values. Make two marks which defined the gauge length (L0) on the test piece. Set the test piece in the grips. Adjust the mass of the test stress
to the calculated value, e.g. by adding or removing lead shot. SIST EN 13206:2017
EN 13206:2017 (E) 15 Carefully hang the test piece with the grips and the test load to the fixed support, avoiding jerks and shocks. During testing, the apparatus shall not be subjected to vibration or shocks which may influence the final measurement. After 100 h,
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