[14] America Society for Testing Materials, Standard Test Methods for
Water Vapor Transmission Rate of Materials (E96), America Society for Testing Materials, Washington, DC, USA, 1995.
Figure 2 illustrates the affect of pinholes on
water vapor transmission rate as detailed in ASTM B479 Standard Specification for Annealed Aluminum and Aluminum-Alloy Foil for Flexible Barrier, Food Contact, and Other Applications.
As per ASTM method D 1653-93 the wet cup method was used to determine the
water vapor transmission and permeance of pigmented coatings.
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
water vapor transmission rate was measured using a Mocon Permatran-W Twin at 23[degrees]C and 100% relative humidity, according to ASTM F 1249-90.
There was significant interaction between the chitosan concentration and molecular weight, affecting the
water vapor transmission rate.
We have had a huge reduction in
water vapor transmission to the inside with the unfortunate trend to plastic vapor barriers, vinyl wall coverings and foil-faced fiberglass batts.
T 465 sp-01 "Static creasing of paper for
water vapor transmission tests" (November 1, 2005)
COC had the lowest
water vapor transmission under stress-test conditions.
LYSSY
water vapor transmission testers are used to assess the quality of nonwovens, films, blister packaging, metallized foils, impermeable fabrics, PUR-coated fabrics for nursing and surgical and hygienic membranes.