DIN 53122 PDF
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.
|Published (Last):||15 February 2013|
|PDF File Size:||16.92 Mb|
|ePub File Size:||8.3 Mb|
|Price:||Free* [*Free Regsitration Required]|
Water vapor permeability (electrolysis method) DIN / DIN A
See DIN for other methods of determining water vapour transmission rates e. Also possible are temperature profiles nonisothermic measurements for the determination of morphology changes and the influence of media and pressure on polymer properties.
Continued on pages 2 to 7. Home Test Lab Permeation What about permeation? 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.
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 don on the accuracy of weighing.
The permeation gas displaces liquid out of a U-tube which is connected with the other chamber. In blank tests, examine samples having low permeation rate and large thickness e. Samples having a thickness greater than 3 mm shall be tested as specified in ISO 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.
The permeation coefficient is calculated as the slope of the displaced volume against time. Subtract the blank values from the values measured for the sample dishes having undergone the same treatment.
Thus the predictions idn resitance, physical and chemical reactions under process conditions can help in the selection process of materials.
We also do the test sample manufacture for you. Water or water vapour.
Use one of the following atmospheres in the evaporation chamber: A tempered test chamber is flushed by a carrier gas with a defined humidity. The concentration is determined and the permeation rate is calculated.
The relative humidity can be readily established in the desiccator by the solutions containing a large excess of salt specified in table 1. In the case of highly transmissive samples, the 531222 of dishes in the evaporation chamber may be kept low to ensure a constant and uniform distribution of humidity within the tolerances for the test atmosphere concerned see subclause 8.
If the samples have been prepared using solvents, 533122 of the latter left in the sample may affect the test results. Details of any treatment of samples to remove the residual solvent shall be included in the test report.
They shall not exhibit any surface inhomogeneities e. The water that has permeated through the sample is carried to the detector by a second carrier gas.
Aluminium dish Figure 3: Furthermore interactions between media and polymer can be investigated. A desiccator as shown in figure 1, for example, in a controlled-temperature or air-conditioned room may be used as evaporation chamber. Please inform us, if your samples dni to mechanical failure under applied pressure of the test gas or the sealings.
This can be remedied, for example, by increasing the mass of desiccant and repeating the test.
This equation applies if the interval between consecutive weighings is 24 hours see subclause 8. Make such blank samples in the same way and subject them to the same conditions, but without desiccant in the dishes. 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.
Water vapor permeability WVTR (electrolysis method) according to DIN 53122-2 / DIN 53122-2-A
Amendments This standard differs from the November edition as follows. Then cover the dishes with the samples and firmly seal them to the dish wall, ensuring that ddin temperature of the sealant and any annular template used does not bring about any alteration in the sample. Check that the increase in mass between two consecutive weighings is at least 5 mg. The test sample is mounted in a permeation cell so as to form the barrier between two xin.
For non flat specimens: 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. In keeping with current practice in standards published by the International Organization for Standardization ISOa comma has been used throughout as the decimal marker.
For undated references, the latest edition of don publication referred to applies. For different test gases and type of samples we use different sized samples. Evaporation chamber without dishes shown in figure 2 or 3 NOTE 2: 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.
You find this article here as a PDF. If this requirement cannot be satisfied because the samples have a high water vapour transmission rate, this shall be recorded in the test report. The standard proposes the following climates: For other time intervals: We recommend the measurement of three independent samples per test minimum number not regulated by the standard.
These normative references are cited at the appropriate places in the text, and the titles of the publications are listed below.