Compatibility Group 1 : A grouping of types of dangerous goods of Class 1 that are deemed to be compatible. Compatibility groups are identified by a letter from A to S following the division number
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}