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6. Building ventilation air intake sys Pouring; 3. When TDI is used: after cessation
tems within 50 feet of the sprayer 1. The pourer and his helper must of pouring, no person may enter
must be turned off during spray wear approved chemical cartridge the 50 foot zone or the enclosed
ing. Such systems must remain respirators. space for at least 30 minutes un
idle for at least 30 minutes there 2. When TDI is used: all other per less he wears an approved chemi-
after, unless the systems are pro sons located within 50 feet of the ' cal cartridge respirator, or unless
vided with air cleaning equipment pouring operation must wear ap mechanical ventilation has been
known to be effective against iso proved chemical cartridge respir employed to insure that TDI con
cyanate mist and vapors. ators. centrations are reduced to levels
below the MAC.
Protective Equipment—Personal pro
tective equipment cannot be used as a
substitute for adequate engineering con
trol measures, but can supplement them
in protecting employees. In many in
stances, it is the only practical means of
protecting the worker, particularly in
emergency situations such as cleaning
up spills and in construction applica
tions. It should be remembered that
personal protective equipment helps
only the worker wearing it; unprotected
workers in the area may be exposed to
danger.
Table 3 outlines the types of protec
tive equipment recommended for var
ious exposure conditions.
TRAINING OF WORKERS
Although isocyanate vapors and sol
vent vapors are toxic, they can be
handled in a safe manner. Employees
should be instructed concerning their
hazards and the precautions to be fol
lowed.
Employees should also be trained to
report promptly to their supervisors all
leaks, suspected equipment failures, ex
posure to isocyanate, or symptoms of
exposure. The importance of good
housekeeping should be emphasized.
Ventilated Cruih Rolls . . , Ronald R. Seard, Engineer,
Table 3^ Kalamazoo District Office
Protective Equipment for Certain Exposures REFERENCES
Coen, R. Plastics Technology Proces
Chemical Gas Mask Type C Rescue sing Handbook. Vol. 13, No. 10.
Exposure Type Type B Supplied Air Rubber Gioves, Harness (October, 1967), 167.
Condition Goggles Cannister Respirator Aprons, etc. & Line Coen, R. and Lerner, A. Plastics Tech
nology. Vol. 13, No. 10. (July, 1966),
Pouring, 97.
handling and X X* X
wiping 3. Brugsch, H. G. and Elkins, H. B. New
England Journal of Medicine, 268.
(February 14, 1963), 353-357.
Entering 4. Occupational Air Contaminants and
heavily contam X • X X Physical Agents. Michigan Occupation
inated areas
al Health Rules R 325.2401 to R 325.-
2448. Effective February 16, 1970.
Protection 5. Urethanes, Engineering Medical Con
against skin X trol and Toxicologic Considerations,
contact Technical Bulletin 105. The Upjohn
' Company (July 1, 1968), 16-17.
Chemical Hazard Information Series,
*This protective respiratory equipment may be used for short-time exposure to isocyanate C-70. American Insurance Association
fumes when adequate ventilation is not available. (Revised April, 1965), 10.
a.
