On Board Trains Occupational Health and Safety Regulations — 7.1
7.1 In this Part, airborne asbestos fibres means asbestos fibres that are longer than 5 μm (micrometres) with an aspect ratio equal to or greater than 3:1 and that are carried by the air; ( fibres d’amiante aéroportées ) asbestos means actinolite, amosite, anthophyllite, chrysotile, crocidolite and tremolite in their fibrous form; ( amiante ) asbestos-containing material means (a) any article that is manufactured and contains 1% or more asbestos by weight at the time of manufacture or that contains a concentration of 1% or more asbestos as determined in accordance with Method 9002 set out in the document entitled NIOSH Manual of Analytical Methods , published by the National Institute for Occupational Safety and Health, as amended from time to time, or in accordance with a scientifically proven method used to collect and analyze a representative sample of the material, and (b) any material that contains a concentration of 1% or more asbestos as determined in accordance with Method 9002 set out in the document entitled NIOSH Manual of Analytical Methods , published by the National Institute for Occupational Safety and Health, as amended from time to time, or in accordance with a scientifically proven method used to collect and analyze a representative sample of the material; ( matériau contenant de l’amiante ) clearance air sampling means the action of taking samples to determine if the concentration of airborne asbestos fibres inside an enclosure is below the limit referred to in section 7.20 to permit the dismantling of a containment system; ( échantillonnage de l’air après décontamination ) containment system means an isolation system that is designed to effectively contain asbestos fibre within a designated work area where asbestos-containing material is handled, removed, encapsulated or enclosed; ( système de confinement ) encapsulation means the treatment of an asbestos-containing material with a sealant that penetrates the material and binds the asbestos fibres together, and the treatment of the surface of the asbestos-containing material with a sealant that creates a membrane on the surface, to prevent the release of asbestos fibres into the air; ( encapsulation ) enclosure means a physical barrier such as drywall, plywood or metal sheeting that, as part of the containment system, isolates asbestos-containing material from adjacent areas in a building to prevent the release of airborne asbestos fibres into those areas; ( encloisonnement ) friable means, in respect of asbestos-containing material, that the material, when dry, can be easily crumbled or powdered by hand pressure; ( friable ) glove bag means a polyethylene or polyvinyl chloride bag that is affixed around an asbestos-containing source and that permits asbestos-containing material to be removed while minimizing the release of airborne asbestos fibres into the work place; ( sac à gants ) hazard information means, in respect of a hazardous substance, information on the proper and safe storage, handling, use and disposal of the hazardous substance, including information relating to the health and physical hazards that it presents; ( renseignements sur les risques ) HEPA filter means a high-efficiency particulate air filter that has been tested to ensure efficiency equal to or exceeding 99.97% for removal of airborne particles having a mean aerodynamic diameter of 0.3 µm (micrometres) from the air; ( filtre HEPA ) high-risk activity means an activity that involves the handling or disturbance of friable asbestos-containing material or is carried out in proximity to friable asbestos-containing material, that requires a high level of control to prevent exposure to excessive concentrations of airborne asbestos fibres and that includes (a) the removal or disturbance of more than 1 m 2 of friable asbestos-containing material in a work place, even if the activity is divided into smaller jobs, (b) the spray application of a sealant to a friable asbestos-containing materi