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Comparison of sampling methods for 1,6·hexamethylene diisocyanate during spray finishing operations.

Authors
England-EC; Carlton-GN; Key-Schwartz-R; Lesagé-J
Source
American Industrial Hygiene Conference and Exposition, May 9-15, 1998, Atlanta, Georgia. Fairfax, VA: American Industrial Hygiene Association, 1998 May; :75
Link
NIOSHTIC No.
20044039
Abstract
This report summarizes the results of a comparison study of isocyanate sampling methods for 1,6-hexamethylene diisocyanate (HDI) in Air Force spray painting environments. This study compared the performance of the Isocheck sampler (Omega, Inc.) and calculated HDI oligomer concentrations from total mass air concentrations against existing NIOSH and OSHA monitoring methods for isocyanates. The results will determine the correlation between sampling results obtained using the Isocheck sampler in field environments and existing sampling methods for HDI. Additionally, because of very limited existing data, the study was accomplished to assess aircraft painters' exposures to isocyanates. Seven methods for monitoring HDI oligomer and monomer levels were compared. Fifty-eight sampling sets were collected during spray painting of aircraft and aircraft parts at four Air Force bases. Impinger and cassette samplers were mounted side-by-side on a mannequin located in maximum paint overspray areas. Additionally, 58 sampling sets of personal breathing zone samples comparing NIOSH 5521, Isocheck sampler, and total aerosol mass methods were collected. Breathing zone air concentrations of HDI monomer ranged from 0.001-0.046 mg/m3. Breathing zone air concentrations of HDI oligomer ranged from 0.01-2.36 mg/ml. Calculated 8-hour time-weighted average exposure levels ranged from 0.01-0.58 mg/m3 for HDI oligomer. It is concluded that aircraft painters monitored in this study have exposures to HDI monomer less than the ACGIH TLV-TWA of 0.034 mg/m3 and exposures to HDI oligomer exceeding the State of Oregon guideline of 1.0 mg/m3 as a ceiling concentration. Comparison data among the various sampling techniques has been statistically analyzed and will be available for presentation
Keywords
Samplers; Sampling-equipment; Sampling-methods; Isocyanates; Spray-painting; Paint-spraying; Paints; Equipment-reliability; Performance-capability; Air-monitoring; Air-samplers; Air-sampling-equipment; Analytical-instruments; Aircraft; Employee-exposure; Workplace-studies; Monomers; Military-personnel; Breathing-zone; Permissible-concentration-limits; Exposure-levels; Exposure-limits; Analytical-methods; Time-weighted-average-exposure
CAS No.
822-06-0
Publication Date
19980509
Document Type
Abstract
Fiscal Year
1998
NTIS Accession No.
NTIS Price
NIOSH Division
DPSE
Source Name
American Industrial Hygiene Conference and Exposition, May 9-15, 1998, Atlanta, Georgia
State
TX; OH; GA
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