DIN Determination of the water vapour transmission rate of plastic film, rubber sheeting, paper, board and other sheet materials by gravimetry. DIN Testing of plastics and elastomer films, paper, board and other sheet materials – Determination of water vapour transmission. DIN ENG_机械/仪表_工程科技_专业资料。Determination of the water vapour transmission rate of plastic film, rubber sheeting.
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Dij the predictions according resitance, physical and chemical reactions under process conditions can help in the selection process of materials. The water that has permeated through the sample is carried to the detector by a second carrier gas. A desiccator as shown in figure 1, for example, in a controlled-temperature or air-conditioned room may be used as evaporation chamber.
Check that the increase in mass between two consecutive weighings is at least 5 mg. Use atmosphere B for rubber sheets, atmosphere D for plastic film and laminated paper, and atmospheres D and E for paper and board.
Water vapor permeability (electrolysis method) DIN / DIN A
It is advantageous to use a light metal lid that covers the dish when it is removed from the test atmosphere and weighed so that the sample releases as little water as possible to the surrounding air during weighing. Cookies make it easier for us to provide you with our services. Then cover the dishes with the samples and firmly seal them to the dish wall, ensuring that the temperature of the sealant and any annular template used does not bring about any alteration in the sample.
This equation applies if the interval between consecutive weighings is 24 hours see subclause 8. 531122 may also be due to sample defects and to differences in water vapour transmission rates in the case of samples with single-side or even double-side lamination.
The concentration is determined and the 531222 rate is calculated. In the case of products having an outer layer, determine the mass per unit area as described in DIN Take the arithmetic mean of the individual values and report it to three significant places, but not to more than one decimal place.
DIN Standard – Testing Instruments – Labthink
Details of sealing samples 8 8. Use one of the following atmospheres in the evaporation chamber: In blank tests, examine samples having low permeation rate and large thickness e.
The specimens shall be uniform in thickness, representative for the material xin free of pinholes 35122 folds. Two points are important in selecting the size of dish, namely preventing the desiccant from becoming saturated during the test, on the one hand, and minimizing the total mass, on the other, to reduce its effect on the accuracy of weighing.
All dimensions are in millimetres. The total water absorption of the agent shall not exceed 1,5 g per 25 cm3 during measurement. If you want to conduct the cutting of the specimens yourself, please contact us for the required dimensions.
Based on this method Mecadi offers further examination to determine gas solubilities sorption and desorptiondiffusion coefficients and the measurement of break through times through barriers.
The permeation coefficient is calculated as the slope of the displaced volume against time. Rin these conditions are fulfilled, the water vapour transmission rate, WVTR, of similar samples of different thickness is inversely proportional to the thickness, i. Testing method aplicable to nearly all materials, e.
On request, we measure your sample thickness according to DIN Normalization of the water vapour transmission rate to a standard thickness is often required, but is possible only for homogeneous material, not for multilayer or laminated samples, and, of course, only in the case of an unaltered and essentially uniform material matrix. The standard proposes the following climates: This, however, is generally unnecessary in the case of non-hygroscopic film or sheets or of dib having low water vapour transmission rates.
We recommend the measurement of three independent samples per test minimum number not regulated by the standard. This can be remedied, for example, by increasing the mass of desiccant and repeating the test.
Under refined test conditions e. A tempered test chamber is flushed by a carrier gas with a defined humidity. Samples having a thickness greater than 3 mm shall be tested as specified in ISO 5312 You find this article here as a PDF. Please contact us for information on special effects and requirements for the samples at high pressures. The relative humidity can be readily established in the desiccator by the solutions containing a large excess of salt specified in table 1.
Balance, capable of weighing to an accuracy of 0,1 mg. For other time intervals: Weigh the dish and sample and the lid if fitted to an accuracy of 0,1 mg, then place it in the evaporation chamber and remove the lid. The amount of water vapour that passes through the test area of the sample surface and is absorbed by the desiccant is determined by weighing the dish at regular intervals and recording the increase in mass. In keeping with current practice in standards published by the International Organization for Standardization ISOa comma has been used throughout as the decimal marker.
Amendments This standard differs from the November edition as follows. For undated references, the latest edition of the publication referred to applies. Also possible are temperature profiles nonisothermic measurements for the determination of morphology changes and the influence of media and pressure on polymer properties.
If this requirement cannot be satisfied because the samples have a high water vapour transmission rate, this shall be recorded in the test report. Water or water vapour.
Please inform us, if your samples tend to mechanical failure under applied pressure of the test gas or the sealings.