DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click HERE
to register or log in.
An Evaluation of HDI in Polyurethane Spray Paint Aerosols.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
Pagination or Media Count:
A combined workplace and laboratory study was conducted to evaluate the exposure potential of HDI Hexamethylene diisocyanate in vapor and particulate states for aliphatic polyurethane spray paint aerosols. The objective of the study was to determine the relationship between detectable HDI and the spray paint aerosol mass concentration. Sampling was accomplished with 1-2-psyridyl piperazine coated glass fiber filters mounted in open faced 37 mm cassettes and analyzed for HDI monomer derivative by HPLC with a UV detector at 254 nm. Vapor samples were collected with a glass fiber prefilter which was then used to determine the corresponding aerosol mass concentration. The results suggest that for a given paint and process, there is a linear relationship between the aerosol mass concentration and the detectable HDI, and that, in the work place, half of the detectable HDI can exist in the vapor state. The results also show that at aersol mass concentrations below 20 mgcu m, it is unlikely that the NIODH recommended ceiling limit of 140 microgramscu m HDI will be exceeded. This can have an important bearing on the selection of respiratory protection for these work environments.
APPROVED FOR PUBLIC RELEASE