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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A tempered test chamber is flushed by a carrier gas with a defined humidity. It is advantageous to use material with a particle size of 1,5 mm diin 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.
This, however, is generally unnecessary in the dni of non-hygroscopic film or sheets or of those having low water vapour transmission rates. 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. The permeation gas displaces liquid out of a U-tube which is connected with the other chamber.
After reaching the desired temperature, the measurement is started. If the wax is spread out on the rims with the aid of a hot spatula, check that the seal dim still intact after the sealant has cooled. The specimens shall be uniform in thickness, representative for the material and free of pinholes and folds.
Under refined test conditions e. The test sample is mounted in a permeation cell so as to form the barrier between two chambers. Use one of the following atmospheres in the evaporation chamber: On request, we measure your sample thickness according to DIN The internal depth of the dish should be between 8 mm and 24 mm, but shall preferably be 15 mm.
The same phenomenon will be observed if the humidity of the test atmosphere varies considerably during weighing. If the samples have been prepared using solvents, residues of the latter left in the sample may affect the test results. See DIN for other methods of determining water vapour transmission rates e.
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.
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: We also do the test sample manufacture for you. Evaporation chamber, with a controlled atmosphere i. The total water absorption of the agent shall not exceed 1,5 g per 25 cm3 during measurement.
Details of any treatment of samples to remove the residual solvent shall be included in the test report. Continued on pages 2 to 7.
Please inform us, if your samples tend to mechanical failure under applied pressure of the test gas or the sealings. 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. Home Test Lab Permeation Dkn about permeation?
DIN Standard – Testing Instruments – Labthink
Based on this method Mecadi offers further examination to determine gas solubilities sorption and desorptiondiffusion coefficients and the measurement of break 553122 times through barriers. Make such blank samples in the same way and subject them to the same conditions, but without desiccant in the dishes.
One chamber is filled with the test gas until test pressure is reached. We recommend the measurement of three independent samples per test minimum number not regulated by the standard. If both surfaces of the sample are to be measured, twice the number of samples shall be prepared.
Thus the predictions according resitance, physical and chemical reactions under process conditions can help in the selection process of materials. Take the arithmetic mean of the individual values and report it to three significant places, but not to more than one decimal place.
Water vapor permeability (electrolysis method) DIN / DIN A
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. Subtract the blank values from the values measured for the sample dishes having undergone the same treatment.
Check that the increase in mass between two consecutive weighings is at least 5 mg.