Document k6kMyv0Q2pQXVgqrRNEQp0OyO
cc Do C. Inderaeh, M.D. K. D. Jfcholic
Subject: FibrouB Talc Exposures at the Lehr Loaders - Departments 6^92 and 64B2
Because some initial personal camples taken for fibrous talc exposures of employes loading glass on the bending lehrs in the Dearborn Class Plant exceeded OSHA regulations, improvements were made in the exhaust system and followed by a complete resampling of all employes working on the lehrs on all three shifts.
The results attached in the data sheet indicate that no employe was exposed above the 03IIA limit of the five fibers per cubic centimeter of air. On July 1, 1976, however, the exposure limit for an eight hour time-weighted average exposure will be reduced to two fibers per cubic centimeter. At that time, if no improve ments are made, approximately half of the employes loading the glass will be exposed above the permissible limit.
The present exposure levels are sufficiently high to assume that some employes are periodically being excessively exposed. It is thus recommended that: (in order of preference)
1. A safer substitute for the present fibrous talc be found.
2. Change the method of applying the talc.
Suggestions: (a) reduce air pressure; (b) charge the talc (as is now applied in the "Lucor" glass dusting); and (c) apply talc with a roller or brush
3. Modify local exhaust ventilation.
This present ventilation system is not adequate even though improvements have been made because canopy hoods cannot effectively control dust from spray operations. A back drafted enclosure with a permanent top and back with flexible sides to permit movement of the glass panels can efficiently control the fibrous talc exposures.
When sampling reveals significant exposures (but below the time-weighted average limit of five fibers per cubic centimeter), OSHA requires routine sampling, although they are not specific concerning the frequency. It is recommended that yearly samples be token based on the concentrations observed.
;007 0095
Pa ee 2
If future sampling reveals excessive exposures vhile a permanent solution is
being effected, respirators can be used as a temporary solution. However,
regulations would require warning signs, employe notification, yearly medical. .
examinations,* and other restrictions.
It is important to alter the existing process to avoid the severe restrictions
which would be imposed by G3HA which will certainly result if no changes are
made by July 1, 197&.
.
Industrial hygienist . Industrial Hygiene Section
Employe Health Services Department
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Attachment
300? 0096
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