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):||7 May 2010|
|PDF File Size:||17.68 Mb|
|ePub File Size:||16.97 Mb|
|Price:||Free* [*Free Regsitration Required]|
For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incorporated in it by amendment or revision.
Home Test Lab Permeation What about permeation? Water or water vapour. A desiccator as shown in figure 1, for example, in a controlled-temperature or air-conditioned room may be used as evaporation chamber.
Subtract the blank values from the values dun for the sample dishes having undergone the same treatment.
Water vapor permeability WVTR (electrolysis method) according to DIN 53122-2 / DIN 53122-2-A
Samples having a thickness greater than 3 mm shall be tested as specified in ISO In blank tests, examine samples having low permeation rate and large thickness e. Details of sealing samples 8 8. They shall not exhibit any surface inhomogeneities e.
The test sample is mounted in a permeation cell so as to form the barrier between two chambers. One chamber is filled with the test gas until test pressure is reached. If the water vapour transmission rate is low, the cin of the samples is large or the samples are very hygroscopic, one or two additional samples shall be prepared.
The permeation 533122 is calculated as the slope of the displaced volume against time. In the case of highly transmissive samples, the number of dishes in the evaporation chamber may be kept low to ensure a constant dn uniform distribution of humidity within the tolerances for the test atmosphere concerned see subclause 8.
The total water absorption of the agent shall dn exceed 1,5 g per 25 cm3 during measurement.
idn You find this article here as a PDF. Cookies make it easier for us to provide you with our services. 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 the two surfaces of the sample are not the same, the test area, i. The specimens shall be uniform in thickness, representative for the material and free of pinholes and folds.
Please inform us, if your samples tend to mechanical failure under applied pressure of the test gas or the sealings. 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.
Water vapor permeability (electrolysis method) DIN / DIN A
The detection limit also depends on the nature and thickness of the specimen. Under refined test conditions e. The standard does not define the sample size or thickness, a measuring area of at least cm 2 is proposed. If both surfaces of the sample are to be measured, twice the number of samples shall be prepared.
The water that has permeated through the sample is carried to the detector by a second carrier gas. Furthermore interactions between media and polymer can be investigated. On request, we measure your sample thickness according to DIN Testing method aplicable to nearly all materials, e.
In the case of products having an outer layer, determine the mass per unit area as described in DIN 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.
Evaporation chamber without dishes shown in figure 2 or 3 NOTE 2: Make such blank samples in the same way and subject them to the same conditions, but without desiccant in the dishes. 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 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. This equation applies if the interval between consecutive weighings is 24 hours see subclause 8.
Check that the increase in mass between two consecutive weighings is at least 5 mg. These normative references are cited at the appropriate places in the text, and the titles of the publications are listed below.
Use one of the following atmospheres in the evaporation chamber: 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. It is advantageous to use material with a particle size of 1,5 mm 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.
The concentration is determined and the permeation rate is calculated. If you want to conduct the cutting of the specimens yourself, please contact us for the required dimensions.
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. We also do the test sample manufacture for you.