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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If the two surfaces of the sample are not the same, the test area, i. We also do the test sample manufacture for you. In case of doubt, the German-language original should be consulted as the authoritative text. 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.
They shall not exhibit any surface inhomogeneities e. A tempered test chamber is flushed by a carrier gas with a defined humidity.
DIN 53122-1
It 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.
We will test with other climate conditions on your request. For undated references, the latest edition of the publication referred to applies. On request, we measure your sample thickness according to DIN The specimens shall be uniform in thickness, representative for the material and free of pinholes and folds. 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.
A desiccator as shown in figure 1, for example, in a controlled-temperature or air-conditioned room may be used as evaporation chamber. The water that has permeated through the sample is carried to the detector by a second carrier gas. Use one of the following atmospheres in the evaporation chamber: If this requirement cannot be satisfied because the samples have a high water vapour transmission rate, this shall be recorded in the test report.
Cookies make it easier for us to provide you with our services. These normative references are cited at the appropriate places in the text, and the titles of the publications are listed below.
See DIN for other methods of determining water vapour transmission rates e. 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.
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. Details of any treatment of samples to remove the residual solvent shall be included in the test report.
We recommend the measurement of three independent samples per test minimum number not regulated by the standard. Aluminium dish Figure 3: 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.
Cover templates of the type shown in figure 4 facilitate the sealing operation. The concentration is determined and the permeation rate is calculated.
Water vapor permeability (electrolysis method) DIN / DIN A
In blank tests, examine samples having low permeation rate and large thickness e. If these conditions are fulfilled, the water vapour transmission rate, WVTR, of similar samples of different thickness is inversely proportional to the thickness, i. Water or water vapour. Furthermore interactions between media and polymer can be investigated. This can be remedied, for example, by increasing the mass of desiccant and repeating the test.
Amendments This standard differs from the November edition as follows. Evaporation chamber, with a controlled atmosphere i. It is advantageous to use material with a particle size of 1,5 sin to 2 mm that passes through a 4 mm sieve, has been freed of any fines using a 1,6 mm sieve, and has been dried in the normal manner.
DIN Standard – Testing Instruments – Labthink
If you want to conduct the cutting of the specimens yourself, please contact us for the required dimensions. For other time intervals: The total water absorption of the agent shall not exceed 1,5 g per 25 cm3 during measurement.

The test sample is mounted in a permeation cell so as to form the barrier between two chambers. Weigh the dish and sample 35122 the lid if fitted to an accuracy of 0,1 mg, then place it in the evaporation chamber and remove the lid.
Since the water vapour transmission rate depends on factors that include the thickness and matrix of the sample material, it is not a material constant.

Under refined test conditions e. For different test gases and type of samples we use different sized samples. Balance, capable of weighing fin an accuracy of 0,1 mg. Please contact us for information on special effects and requirements for the samples at high pressures.
The detection limit also depends on the nature and thickness of the specimen. 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. In keeping with current practice in standards published by the International Organization for Standardization ISOa comma has been used throughout as the decimal marker.
Water vapor permeability WVTR (electrolysis method) according to DIN 53122-2 / DIN 53122-2-A
Sealant, consisting of a wax mixture that adheres strongly to both the dish and the sample, is not brittle at the measuring temperature and is neither hygroscopic nor susceptible to oxidation.
You find this article here as a PDF. The relative humidity can be readily established in the desiccator by the solutions containing a large excess of salt specified in table 1.
If both surfaces dni the sample rin to be measured, twice the number of samples shall be prepared. After reaching the desired temperature, the measurement is started. One chamber is filled with the test gas until test pressure is reached.
