Division 22 23 Ebook Page 27 Glossary of Insulation Terms

Glossary Glossary of Insulation Terms Disclaimer of Liability Technical information contained herein is furnished without charge or obligation and is given and accepted at recipient's sole risk. Because conditions of use may vary and are beyond our control, Owens Corning makes no representation about, and is not responsible or liable for the accuracy or reliability of data associated with particular uses of any product described herein. Nothing contained in this bulletin shall be considered a recommendation. Relative Humidity : The ratio of the mol fraction of water vapor present in the air to the mol fraction of water vapor present in saturated air at the same temperature and barometric pressure. Resistance, Thermal (R) : The reciprocal of thermal conductance , R = hrft 2 F/Btu (m 2 C/W). Sorption : Refers to the taking up and holding of water by various processes such as absorption and adsorption . Sound Absorption : The process of dissipating or removing sound energy; the property possessed by materials, objects and structures (such as rooms) of absorbing sound energy; the measure of the magnitude of the absorptive property of a material, object or structure. Sound Absorption Coefficient : The percentage of sound energy incident on the surface of a material that is absorbed by the material. Static Pressure : The normal force per unit area at a small hole in the wall of a duct through which a fluid is flowing. Water Vapor Permeance : Time rate of water vapor transmission through unit area of flat material or construction, induced by vapor pressure difference between two specific surfaces, under specified temperature and humidity conditions. Water Vapor Retarder : A material or system that adequately impedes the transmission of water vapor under specified conditions. References: NEBB, National Environmental Balancing Bureau: Environmental Systems Technology , Chapter 19, Glossary. ASTM, American Society for Testing and Materials: ASTM C 168-90, Standard Terminology Relating to Thermal Insulating Materials. OWENS CORNING INSULATING SYSTEMS, LLC ONE OWENS CORNING PARKWAY TOLEDO, OHIO 43659 1-800-GET-PINK www.owenscorningcommercial.com Pub. No. 10012935-A. Printed in U.S.A. May 2012. THE PINK PANTHER & 1964-2012 Metro-Goldwyn-Mayer Studios Inc. All Rights Reserved. The color PINK is a registered trademark of Owens Corning. 2012 Owens Corning. All Rights Reserved.

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