Addition of 10% of glass flake in chloroprene rubber gave a ten-fold reduction in water vapor transmission
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
These materials were tested for their tensile strength, elastic modulus, elongation, and oxygen and water vapor transmission
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.