Classification of industrial dust exposure hazard levels Jurisdiction China Year 1988 Published in Chinese Original/other title [Chinese] Shengchanxing fenchen zuoye weihaichengdu fenji Source 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). Serial number GB 5817-86 Descriptors [Primary] China, exposure evaluation, free silica, respirable dust, sampling and analysis [Secondary] classification systems, comment on standard, description of technique, silica, standard Subject category Chemical safety Abstract 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 Database ID 56616