A Sequential Tape Monitor for Toluene Diisocyanate

Isocyanates

“…A downward trend in TDI levels from 0.003 to 0.001 ppm during 10 years was also observed in two other polyurethane plants [407,408,409]. A 3year survey of TDI concentrations in two foam plants resulted in TWA's of 0.0024 ppm, 0.0011 ppm and 0.0015 ppm for foam workers, finishing and maintenance personnel [410]; the use of a sequential tape monitor revealed levels in excess of the OSHA ceiling in 1.3% of the 12-minute samples [390]. A 3year survey of TDI concentrations in two foam plants resulted in TWA's of 0.0024 ppm, 0.0011 ppm and 0.0015 ppm for foam workers, finishing and maintenance personnel [410]; the use of a sequential tape monitor revealed levels in excess of the OSHA ceiling in 1.3% of the 12-minute samples [390].…”

Diisocyanate Emission from a Paint Product: A Preliminary Analysis

“…¹g=gm wet product/hour D (¹g/ml diisocyanate)(MW i =MW u )(5ml)/gm wet product=hour [1] where MW i D molecular weight of the diisocyanate MW u D molecular weight of the urea derivative A maximum TDI emission rate of 0.32 ¹g of TDI/gram of wet product applied/hour was observed for the 1-hour sampling time from PC-220 Gray, 0.38 ¹g of TDI/gram of wet product applied/hour was observed for the 5-hour sampling time, and 0.02 ¹g of TDI/gram of wet product applied/hour was observed for the 15-hour sampling time. The decrease in rate of TDI emission over the 15-hour period indicates that emission of TDI is virtually complete after 5 hours.…”

“…(1) They are characterized by the presence of two isocyanate, NCO, functional groups. Toluene diisocyanate (TDI) and isophorone diisocyanate (IPDI) are common commercial forms and are the focus of this study.…”