These test methods cover the determination of water vapor
transmission (WVT) of materials through which the passage of water vapor may be
of importance, such as paper, plastic films, other sheet materials, fibe rboards,
gypsum and plaster products, wood products, and plastics. The test methods are
limited to specimens not over 11/4 in. [32 mm] in thickness except as provided
in Section 9. Two basic methods, the Desiccant Method and the Water Method, are
provided for the measurement of permeance, and two variations include service
conditions with one side wetted and service conditions with low humidity on one
side and high humidity on the other. Agreement should not be expected between
results obtained by different methods. The method should be selected that more
nearly approaches the conditions of use.
The values stated in either SI units or inch-pound units are
to be regarded separately as standard. The values stated in each system may not
be exact equivalents; therefore, each system shall be used independently of the
other. Combining values from the two systems may result in non-conformance with
the standard. However, derived results can be converted from one system to the
other using appropriate conversion factors.
(A) These units are used in the construction trade. Other
units may be used in other standards.
(B) All conversions of mm Hg to Pa are made at a temperature
of 0°C.
As per EN 1602, Liquid water permeability shall be determined in accordance with EN 1062-3 and classified as follows:
And, Water vapour transmission rate shall be determined in accordance with EN ISO 7783-2, shall be classified as :
Let us see the LAB testing procedure:
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