Asbestos Fibre : A particle of asbestos that: (a) is not less than 5 micrometres and not more than 100 micrometres in length; and (b) is less than 3 micrometres in width; and (c) has a length to width ratio of not less than 3 to 1
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}