This data sheet describes air-purifying and air-supplierd respirators and their effectiveness in protecting users against airborne organic vapours, gasses, spray mists and dusts produced by materials used in the visual arts, theatre and conservation. Topics include: types and selection of respirators, filters and cartridges; restrictions; fitting,(fit testing); sources; and the U. S. Occupational Safety and Health Act,(OSHA) Respirator Programme. References.