1. MOISTURE VAPOR TRANSMISSION RATE (MVTR)
What is Moisture Vapor Transmission Rate (MVTR)?
MVTR stands for "Moisture Vapor Transmission Rate", a measure of the passage of
gaseous H2O through a barrier. It's also known as "WVTR", or "Water Vapor
Transmission Rate".
How is moisture resistance measured?
Moisture resistance is measured in a special chamber where it is divided vertically by the
substrate/barrier material. A dry atmosphere is in one chamber, and a moist atmosphere is
in the other. A 24-hour test is run to see how much moisture passes through the
substrate/barrier from the "wet" chamber to the "dry" chamber. Standard test procedures
(TAPPI T-464, ASTM E96) can specify any one of five combinations of temperature and
humidity in the "wet" chamber. The toughest conditions are 100°F / 95%RH (Relative
Humidity).
Currently, the best barrier material on the market today has an MVTR of .02. At
Protective Packaging Corporation we focus on providing only the highest quality
moisture barrier materials. With more than 25 years of experience in the field, we have
the expertise to answer any of your questions. More importantly, our experience is what
allows us to offer the most effective solutions, no matter the situation.
Protective Packaging specializes in protecting products, equipment, and machinery from
corrosion, electrostatic discharge, contaminants, ultraviolet rays and dust during shipping
and storage. Our corrosion protection products and services consist of: anti-static and
static shielding bags, flexible packaging materials, moisture barrier bags, Mil-Spec
(military specified) packaging materials, volatile corrosion inhibitors, desiccants,
humidity indicator devices, on-site packaging, packaging consulting, and custom-made
packaging.
For more information, please visit: http://www.protectivepackaging.net