|Document ID (ISN)||57387|
|ISSN - Serial title
||0829-0369 - Travail et santÚ
|Convention or series no.
||Buser S., Nicole C., Droz P.O.
||Exposure to tertiary amines in iron foundries
||Exposition aux amines tertiaires dans les fonderies [in French]|
||Winter 1991, Vol.7, No.4, p.S.33-S.37. Illus. 14 ref.
||Tertiary amines, mainly N,N-dimethylethylamine (DMEA), are widely used in iron foundries for the manufacture of cores by the cold box or Ashland process. DMEA is known for its irritating effects and its effect on vision. Exposure standards in Switzerland, Germany and the USA do not seem to offer sufficient protection for workers. Instead of the present 25ppm limit, based on an 8-h average, 5ppm would be more justified after a review of the available toxicological information. The objective of the present study was to characterise the present situation regarding DMEA in some foundries, and to investigate if a 5ppm average concentration was technically feasible. Personal exposures to DMEA by 24 operators working on 15 machines in 3 foundries were measured. Based on the available toxicological information for DMEA and on the exposure levels found in the present study, the following recommendations can be made: decrease the TWA limit from 25 to 5ppm; establish a STEL limit of 25ppm for a 30 minutes period; use ventilation hoods with at least 0.5m/s face velocity. Finally, special care should be given to the maintenance of the core making machines and the moulds to avoid excessive and uncontrollable leaks.
||ethyldimethylamine; amines; foundries; limitation of exposure; moulding and coremaking
||threshold limit values
||D - Periodical articles
|Country / State or Province||Canada; Switzerland|
||Metal production and metalworking
|Broad subject area(s)
Foundries, metalcasting and forging operations