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Abstract

A moisture permeability method comprising the steps of measuring the weight of a specimen in constant temperature and humidity room without taking out the specimen from the constant temperature and humidity room to the atmosphere and without being affected by vibration and objectively evaluating the results of the weight measurement by detecting the state of the water vapor permeating a sample and the temperature of stored water; a moisture permeability measuring device, wherein a precision electronic scale (7) is installed on a damoing stand (6) set in the constant temperature and humidity room (P), the weight of the specimen (T) in which the sample (2) is installed on a measuring cup (1) containing water (W) is measured by the precision electronic scale and the measured results are converted into a moisture permeability, the measuring cup (1) comprising a cup main body (10) and a retaining ring (11), thermocouples (40) immersed in water being installed through the peripheral wall part of the cup main body, and a temperature--humidity sensor (41) being attached to extend to a space (15) between the water surface and the sample.

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First Claim