|Document ID (ISN)||58750|
|ISSN - Serial title
||1047-322X - Applied Occupational and Environmental Hygiene
|Convention or series no.
||Air concentrations of TDI and total reactive isocyanate group in three flexible polyurethane manufacturing facilities
||Oct. 1991, Vol.6, No.10, p.853-858. Illus. 15 ref.
||To study workers potentially exposed to toluene diisocyanate (TDI), surveys were conducted in two large facilities manufacturing molded flexible foam and one facility manufacturing and finishing flexible slab foam. The air sample results show that isocyanate concentrations differed from plant to plant and were probably dependent on the operations performed, engineering controls, and the physical layout of the plant. In the two molded foam facilities, many of the personal exposures were above 35µg/m3, the workshift air standard recommended by the National Institute for Occupational Safety and Health (NIOSH). Pouring line workers were generally more exposed than finishing workers. However, thermal degradation of foam can release toxic substances, including TDI, into the air. This was found to occur in some of the finishing operations. Throughout the facilities, the concentration of the 2,6-isomer was found usually to be at least as great as the 2,4-isomer. Total reactive isocyanate group was determined using NIOSH method 5505.
||polyurethane; isocyanates; exposure; expanded plastics; air sampling; tolylene diisocyanate
||personal sampling; occupational health survey; permissible levels; pyrolysis products
||D - Periodical articles
|Country / State or Province||USA|
||Chemicals, plastics and rubber
|Broad subject area(s)