ASTM F739 : Standard test method for resistance of protective clothing materials to permeation. Gives a consistent and repeatable method to determine if material "X" provides sufficient barrier to chemical "Y"
DuPont (The Miracles of Science), Literature & Technical Information, Industrial Personal Protection Glossary, Wilmington, DE, USA 2010http://www2.dupont.com/Personal_Protection/en_ HK/tech_info/glossary_industrial.html, (IndPP - Amer) {49}