water vapor transmission

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Related to water vapor transmission: water vapor permeability, Moisture vapor transmission rate

water vapor transmission (WVT)

The rate of water vapor flow, under steady specified conditions, through a unit area of material between the two parallel surfaces (and normal to these surfaces).
References in periodicals archive ?
Addition of 10% of glass flake in chloroprene rubber gave a ten-fold reduction in water vapor transmission rate.
ASTM Standard E96, Test Methods for Water Vapor Transmission of Materials, prescribes two specific cases of this procedure--a dry cup method that gives the permeance or permeability at a mean RH of 25% and a wet cup method that gives the permeance or permeability at a mean RH of 75%.
This paper exhibited approximately the same water vapor transmission rate and grease resistance as the paper made from high freeness 100% sulfite pulp.
The oxygen and water vapor transmission rates decreased with increasing filler content (Table 2 and Fig.
01 Water vapor transmission rate *, g-mil/100 inch squared 24 hour-atm 0.
According to Ticona, films made with the blend are relatively rigid and have a low water vapor transmission rate, and the blends can be processed rapidly in automated equipment with a minimum of problems.
Some of the blends, t he compression molded 50/50 blends and the film blown A950 blends, showed unexpected high oxygen and water vapor transmission rates.
These materials were tested for their tensile strength, elastic modulus, elongation, and oxygen and water vapor transmission rates.
Another attribute that changed was the water vapor transmission of the plastic building papers versus the traditional building papers (impregnated felts and asphalt-saturated kraft paper) (Figure 2).
T 448 om-04 Water vapor transmission rate of paper and paperboard at 23[degrees]C and 50% RH
Used as a barrier additive in paints and coatings, glass flake is said to offer significant advantages in reduced water vapor transmission and shrinkage, increased film stability, and improved wear resistance.