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Moisture vapor transmission rate

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  • 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 ofgaseous H2O through a barrier. Its also known as "WVTR", or "Water VaporTransmission Rate".How is moisture resistance measured?Moisture resistance is measured in a special chamber where it is divided vertically by thesubstrate/barrier material. A dry atmosphere is in one chamber, and a moist atmosphere isin the other. A 24-hour test is run to see how much moisture passes through thesubstrate/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 andhumidity in the "wet" chamber. The toughest conditions are 100°F / 95%RH (RelativeHumidity).Currently, the best barrier material on the market today has an MVTR of .02. AtProtective Packaging Corporation we focus on providing only the highest qualitymoisture barrier materials. With more than 25 years of experience in the field, we havethe expertise to answer any of your questions. More importantly, our experience is whatallows us to offer the most effective solutions, no matter the situation.Protective Packaging specializes in protecting products, equipment, and machinery fromcorrosion, electrostatic discharge, contaminants, ultraviolet rays and dust during shippingand storage. Our corrosion protection products and services consist of: anti-static andstatic 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-madepackaging.For more information, please visit: http://www.protectivepackaging.net

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