1、ICS 83.140.10Prfung von Kunststoffen Bestimmung der Gasdurchlssigkeit Teil 1: Volumetrisches Verfahren zur Messung an Kunststoff-FolienIn keeping with current practice in standards published by the International Organization for Standardization(ISO), a comma has been used throughout as the decimal m
2、arker.ContentsPageForeword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Normative reference . . . . . . . . .
3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Designation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4、 . . . . . 25 Transmission rate tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Apparatus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Specimens . . . . . . . . . . . . . . . . . . . . . . . .
5、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510
6、Test report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5ForewordThis standard has been prepared by Technical Committee Kunststoff-Folien und kunststoffbeschichteteFlchengebilde (Kunstleder); allgemeine Eigenschaften of the Normenausschuss Ku
7、nststoffe (PlasticsStandards Committee).AmendmentsThis standard differs from DIN 53380, June 1969 edition, as follows:a) The standard consists of several parts.b) More detailed specifications have been included for equipment and procedure.c) The standard has been editorially revised.Previous edition
8、DIN 53380: 1969-06.Ref. No. DIN 53380-1 : 2000-07English price group 05 Sales No. 010507.02DEUTSCHE NORM July 200053380-1Continued on pages 2 to 5. No part of this translation may be reproduced without the prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 B
9、erlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).Determining the gas transmission rate ofplastic film by the volumetric methodTranslation by DIN-Sprachendienst.In case of doubt, the German-language original should be consulted as the authoritative text.Supersedes DIN
10、53380,June 1969 edition.Page 2DIN 53380-1 : 2000-071 ScopeThe method specified in this standard serves to determine the rate of transmission of gas (e.g. O2, CO2, N2,andmixtures thereof) through plastic film and, consequently, the suitability of such film, for example, for packagingdelicate goods. I
11、t cannot be used for gas that tends to condense and to react chemically with the specimenmaterial.The gas transmission rate is measured by determining the volume of gas that migrates through the specimenunder specified conditions, those given in clause 8 being suitable for determining gas transmissi
12、on rates rangingfrom about 3 cm3/(m2. d . bar) to 20000 cm3/(m2. d . bar) (where d is symbol for day). Since the gastransmission rate depends on the thickness of the product, reproducible results can be obtained only withspecimens of equal thickness. For homogeneous materials, the gas transmission r
13、ate is generally inverselyproportional to the thickness.2 Normative referenceThis standard incorporates, by dated or undated reference, provisions from other publications. These normativereferences are cited at the appropriate places in the text, and the titles of the publications are listed below.
14、Fordated references, subsequent amendments to or revisions of any of these publications apply to this standardonly when incorporated in it by amendment or revision. For undated references, the latest edition of thepublication referred to applies.DIN 53370 Determining plastic film and sheeting thickn
15、ess by the stylus method3 ConceptGas transmission rateThe volume of gas that passes through a material per unit time, area and pressure.4 DesignationDesignation of the method of determining the gas transmission rate by the volumetric method (V):Test DIN 53380 V5 Transmission rate tester5.1 GeneralTh
16、e transmission rate tester consists of a two-part stainless steel cell, a measuring capillary with a glasspressure compensating vessel, tightly joined to the cell, and a manifold (see figure 1).5.2 Steel cellThe steel cell consists of the following components.a) The lower part incorporates a steel p
17、late to receive the circular specimen. This plate consists of two areas,viz. an inner circular area, to receive the specimen, roughened by sand-blasting to ensure that the spacingbetween the specimen bottom surface and the metal surface is sufficiently large to allow the gas permeatingthrough the sp
18、ecimen to flow into the capillary and, surrounding the roughened area, a smooth ground andpolished annular zone that is greased during measurement to ensure gastightness.b) The upper part contains the connections for the inlet and outlet of the test gas. The outlet tube isconnected by a hose to a gl
19、ass tip immersed to a depth of a few millimetres in water (the increase in gaspressure above the specimen by a few tenths of a millibar above atmospheric pressure being negligible).c) A rubber gasket is located in a groove in the upper part of the cell and pressed against the smooth groundand polish
20、ed outer zone of the lower part of the cell.d) Hexagon socket screws for joining the two parts of the cell.e) A glass capillary tube, about 1 mm in diameter and about 240 mm long, whose upper end is tightlycemented into the lower part of the cell (thermoplastic cement being suitable for this purpose
21、). At the lowestpoint in the bend at the bottom, the diameter widens from 1 mm to about 5 mm. At this point there is a mercurydrop (having a volume of about 10 mm3) before the measurement is started. This drop is later forced into thecapillary to form a column about 15 mm long.f) A glass pressure co
22、mpensating vessel, fitted with a stopcock, with a volume at least two hundred timesthe volume of the capillary. The widened section of the capillary tube opens into the vessel.NOTE: The large volume of the pressure compensating vessel has been designed to ensure that the standardpressure, pu, remain
23、s constant throughout the test.Page 3DIN 53380-1 : 2000-071 Lower part of cell 09 Manifold2 Upper part of cell 10 Stand3 Rubber gasket 11 Gas inlet4 Hexagon socket screw 12 Stopcock plug fitted with capillary tube5 Glass capillary 13 Vacuum connection6 Stopcock 14 Vent7 Pressure compensating vessel
24、15 Connection to vacuum gauge8 Specimen 16 Connection to stopcock (6)Figure 1: Transmission rate testerPage 4DIN 53380-1 : 2000-075.3 ManifoldThe manifold servesa) to feed gas into the space above the specimen;b) to evacuate the capillary and the pressure compensating vessel;c) to adjust the inlet p
25、ressure and the pressure in the capillary using two stopcocks fitted with capillary tubeshaving a bore of 0,1 mm to 0,2 mm in diameter.Other test equipment may be used provided it meets the requirements specified in this standard and the variationin the results of three measurements on one specimen
26、does not exceed 10 %.6 ApparatusThe following equipment shall be used.6.1 Vacuum gauge, capable of measuring the pressure to an accuracy of 2 mbar.6.2 Thickness gauge (as in DIN 53370).6.3 Vacuum pump.6.4 Thermometer, capable of measuring the temperature of the transmission rate tester to the neares
27、t 0,2 C.6.5 Timer, capable of measuring the test time to one second.7 SpecimenSpecimens shall be taken from areas uniformly distributed over the surface of the material under test and shallbe circular, with a diameter depending on the dimensions of the test equipment used (about 100 mm). They shallb
28、e representative of the material and shall be free from marks or visible defects (e.g. holes, creases).Unless otherwise specified, at least three specimens shall be tested in one direction. Specimens of hygroscopicmaterials shall be conditioned before testing at (23 t 2) C in the selected atmosphere
29、, the duration dependingon the material under test.8 ProcedureAfter conditioning the specimens (if required) as described in clause 7, measure the thickness of every specimenat five points as specified in DIN 53370.Carry out the test at (23 t 2) C with dry gas. To test at other temperatures or with
30、moist gas (preferably at 45 %,75 % and 85 % relative humidity), agree the test conditions and indicate them in the test report as deviating fromthis standard.Using a template, apply a thin film of vacuum grease to the polished outer zone and place the specimen cut outof the sample in position. Mount
31、 the upper part of the cell and the rubber gasket, then press the two parts of thecell together by means of hexagon socket screws.Pass the test gas into the upper part of the cell at a flow rate of about ten bubbles per minute.Evacuate the capillary and vessel to a pressure of about 2 mbar, then int
32、roduce gas into the capillary and vesseluntil the pressure is 10 mbar to 450 mbar, depending on the expected transmission rate (subject samples of lowpermeability having gas transmission rates of less than 10 cm3/(m2. d . bar) to 10 mbar and samples of highpermeability having gas transmission rates
33、of greater than 1000 cm3/(m2. d . bar) to 450 mbar).Swivel the tester anticlockwise around its horizontal axis until the mercury is at the entrance of the capillary.Introduce air through the venting chamber on the manifold while at the same time tilting the test system backclockwise until the mercur
34、y column forced into the capillary is situated around the zero of the scale.The pressure in the pressure compensating vessel read off on the vacuum gauge, in mbar, minus the pressurerepresented by the mercury column (40 mbar to 55 mbar) yields the pressure of the gas at the underside of thespecimen,
35、 pu.Record the fall in the mercury column at suitable intervals, gently tapping the test system before every reading(the uncertainty in the reading being 0,25 mm) so that the column reaches the steady-state position despite thefriction at the capillary wall.Once a constant rate of fall of the mercur
36、y column is observed, the measurement may be stopped.Page 5DIN 53380-1 : 2000-079 EvaluationCalculate the gas transmission rate, q, in cm3/(m2. d . bar), using the following equation:tXSppppATpTqDD24104=uambwunnwherepnis the standard pressure, in bar (pn= 1,01325 bar);Tnis the standard temperature,
37、in K (Tn= 273,15 K);T is the test temperature, in K;A is the test area of the specimen, in cm2;Dt is the time interval between two readings for steady-state permeation, in h;puis the pressure, in mbar, in the chamber above the specimen (manometer pressure) minus the pressuredue to the length of the
38、mercury column in the capillary, in mbar (the value of this pressure is equal to thelength of the column in millimetres multiplied by 1,333);pambis the atmospheric pressure, in mbar;S is the cross section of the capillary tube, in cm2;DX is the rate of fall of the mercury column, in cm/h, for steady
39、-state permeation over time interval Dt;pwis the partial pressure of water vapour, in mbar. For tests involving moist gas, the water vapour partialpressure shall be substituted (e.g. 23,9 mbar at 23 C and 85 % relative humidity).10 Test reportThe test report shall refer to this standard and include
40、the following details:a) description of the material tested;b) nature of gas and its humidity;c) any conditioning of specimen;d) mean thickness of specimen;e) temperature of transmission rate tester;f) gas transmission rate, q, in cm3/(m2. d . bar) (single values and mean ), given to the nearest integers andcontaining no more than three significant figures (two in the case of low gas transmission rates and three inthe case of medium and higher rates);g) any conditions deviating from this standard;h) date of testing.
