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.
|Country:||Bosnia & Herzegovina|
|Published (Last):||12 February 2017|
|PDF File Size:||1.74 Mb|
|ePub File Size:||18.10 Mb|
|Price:||Free* [*Free Regsitration Required]|
Dib normative references are cited at the appropriate places in the text, and the titles of the publications ddin listed below. 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.
See DIN for other methods of determining water vapour transmission rates e. The standard proposes the following climates: 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. Check that the increase in mass between two consecutive weighings is at least 5 mg.
Details of sealing samples 8 8.
Water vapor permeability (electrolysis method) DIN / DIN A
If these conditions are fulfilled, the water vapour transmission rate, WVTR, of similar samples of different thickness is inversely proportional to the thickness, i. For non flat specimens: The water that has permeated through the sample is carried to the detector by djn second carrier gas.
Cover templates of the type shown in figure 4 facilitate the sealing operation. A desiccator as shown in figure 1, for example, in a controlled-temperature or air-conditioned room may be used as evaporation chamber. This equation applies if the interval between consecutive weighings is 24 hours see subclause 8. 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.
Water vapor permeability WVTR (electrolysis method) according to DIN 53122-2 / DIN 53122-2-A
After reaching the desired temperature, the measurement is started. They shall not exhibit any surface inhomogeneities e. Samples having a thickness greater than 3 mm shall be tested as specified in ISO If dim wax is spread out on the rims with the aid of a hot spatula, check that the seal is still intact after the sealant has cooled.
For different test gases and type of samples we use different sized samples. Furthermore interactions between media and polymer can be investigated. In keeping with current practice in standards published by the International Organization for Standardization ISOa comma has been used throughout as the decimal marker.
If the samples have been prepared using solvents, residues of the latter left in the sample may affect the test results. Use atmosphere B for rubber sheets, atmosphere D for plastic film and laminated paper, dinn atmospheres D and E for paper and board.
Make such blank samples in the same way and subject them to the same conditions, but without desiccant in the dishes. The permeation coefficient is calculated as the slope of the displaced volume against time. This can be remedied, for example, by increasing the mass of desiccant and repeating the test. You find this article here as a PDF. The internal depth of the dish should be between 8 mm and 24 mm, but shall preferably be 15 mm. Based on this method Mecadi offers further examination to determine gas solubilities sorption and desorptiondiffusion coefficients and dkn measurement of break through times through barriers.
For other time intervals: Please contact us for information on special effects and requirements for the samples at high pressures.
DIN Standard – Testing Instruments – Labthink
Subtract the blank values from the values measured for the sample dishes having undergone the same treatment. If the two surfaces of the sample are not the same, the test area, i. In case of doubt, the German-language original should be consulted as the authoritative text. 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. All dimensions are in millimetres. We will test with other climate conditions on your request.
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.
One chamber is filled with the test gas until test pressure is reached. If the water vapour transmission rate is low, the thickness of the samples is large or the samples are very hygroscopic, one or two additional samples shall be prepared.
The total water absorption of the agent shall not exceed 1,5 g per 25 cm3 during measurement.