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Document ID (ISN)28869
CIS number 78-431
Year 1977
Convention or series no.
Title Criteria for a recommended standard - Occupational exposure to tungsten and cemented tungsten carbide.
Bibliographic information DHEW (NIOSH) Publication No.77-127, National Institute for Occupational Safety and Health, 4676 Columbia Parkway, Cincinnati, Ohio 45226, USA, Sep. 1977. 174p. Illus. 108 ref.
Abstract Recommendations are made for the prevention of occupational diseases due to tungsten and cemented tungsten carbide. Occupational exposure shall be controlled so that there is no exposure to concentrations greater than 5mg insoluble tungsten/m3; 1mg soluble tungsten/m3; 0.1mg/m3 cemented tungsten carbide containing more than 2% cobalt, measured as cobalt; and 15µg/m3 cemented tungsten carbide containing more than 0.3% nickel, determined as nickel, all as time-weighted average concentrations for up to a 10h workshift in a 40h workweek. Other recommendations relate to medical supervision, labelling, personal protective equipment and clothing, information of employees, work practices, sanitation, monitoring and recordkeeping. The criteria on which the recommendations are based are discussed under the heads: biological effects of exposure, environmental data and engineering controls, development of standard, research needs. Procedures for sampling and analysis in air are detailed and useful additional information is given in appendices.
Descriptors (primary) tungsten carbide 1:1; threshold limit values; tungsten; powder metallurgy; USA
Descriptors (secondary) literature survey; information of personnel; nickel; respirable dust; warning notices; personal protective equipment; respirators; animal experiments; safe working methods; dose-response relationship; biological effects; carcinogenic effects; health service records; air sampling; determination in air; medical supervision; directive; cobalt
Document type F - Information notes, codes of practice, standards
Subject(s) Toxic and dangerous substances
Broad subject area(s)
Browse category(ies) Occupational exposure limits
Metalworking industry
Inorganic substances