[inglés] Classification of industrial dust exposure hazard levels Jurisdicción China Ańo 1988 Publicado en chino Título original / otro título [chino] Shengchanxing fenchen zuoye weihaichengdu fenji Fuente [inglés] In: Reference Collection of National Occupational Safety and Health Standards 1985-1986, China Standards Publishing Co., Beijing, China, Apr. 1988, p.62-74. Price: CNY 11.00 (whole volume). Número de referencia GB 5817-86 Descriptores [Principales] China, polvos respirables, sílice libre, toma de muestras y análisis, valoración de la exposición [Secundarios] comentario de norma, descripción del procedimiento, norma, sistemas de clasificación, sílice Categoría Riesgos químicos Resumen [inglés] This standard (effective 1 Nov. 1986) sets forth a 5-level classification of risks to which workers are exposed, based on the free silica content and concentration of a given dust and on the volume of air breathed per day per worker in the presence of the dust. Appendices give a method for determining free silica and a guide to sampling. The commentary attached to the standard lists the properties of various dusts (including silica contents), the volume of air breathed per day in various occupations and the dust hazard level in factories and mines, based on measurements made in 1981, 1982 and 1983. CIS No. 91-1415 Número de registro 56616