Impervious 08 : Providing protection by precluding penetration of a substance (as demonstrated by methods in Military Standard 282) for the useful life of the item concerned
US Army Center for Health Promotion and Preventive Medicine CHPPM, TG 204 Glossary of Terms For Nuclear, Biological, and Chemical Agents And Defense Equipment (Section 5 - Chemical Terms), MD, USA 2001. http://www.au.af.mil/au/awc/awcgate/army/tg204.pdf , (DfnsEqu/Chem - Amer) {490}
Madison County North Carolina Government, Madison County Emergency Operations Plan Glossary (Section 5: Chemical Terms), NC, USA 2009. http://www.madisoncountync.org/eop/Madison_EOP_PDF /Glossary.pdf, (CBRNEmr - Amer) {877}