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Airborne hexamethylene diisocyanate and particulate exposures during fire/rescue vehicle ladder finishing operations.

Methner M; Achutan C
American Industrial Hygiene Conference and Exposition, May 13-16, 2006, Chicago, Illinois. Fairfax, VA: American Industrial Hygiene Association, 2006 May; :59
NIOSH received a health hazard evaluation request from a fire/rescue vehicle ladder manufacturer to evaluate employee exposures to hexamethylene diisocyanate (HDI) VOCs, particulates, and silica during sanding and painting activities. PBZ samples for HDI and VOCs were collected on 15 workers engaged in painting. Eleven workers were monitored for particulates while sanding ladders. Airflow rates within two side-draft spray booths were measured and compared with recommended guidelines. No air samples collected for HDI monomer exceeded the NIOSH REL of 35 micrograms per cubic meter (ug/m3). No OSHA PEL for HDI monomer exists. However, the United Kingdom Health and Safety Executive (UK-HSE) publishes a Total Reactive Isocyanate Group (TRIG) eight-hour time-weighted average (TWA) limit of 20 ug/m3 and a Ceiling Limit of 70 ug/m3. Of the 15 painters sampled for HDl, six had PBZ levels that exceeded the TRIG eight-hour TWA, while four workers exceeded the TRIG Ceiling Limit. VOC samples were below occupational exposure criteria. All painters wore PPE; however, the choice of latex gloves offered little skin protection from isocyanates. Additionally, workers often got paint on their skin during mixing and used methyl ethyl ketone to remove it. Airflow measurements in one paint booth revealed inadequate ventilation (<100 fpm) while the other booth was approximately seven times higher. Two workers who sanded ladders had particulate exposures that exceeded the ACGIH TLV (10 milligrams per cubic meter of air [mg/m3]), while another worker exceeded the OSHA PEL of 15 mg/m3. No silica (quartz and cristobalite) was found in the air samples. Workers who sanded sometimes used N95 filtering facepiece respirators. Recommendations included: use of NIOSH-approved N95 filtering respirators during sanding; the development of a formal respiratory protection program; maintaining at least 100 fpm airflow in all spray booths; and use of nitrile gloves when mixing/spraying paint.
Health-hazards; Painting; Exposure-levels; Risk-factors; Particulates; Particulate-dust; Sampling; Humans; Men; Women; Air-samples; Monomers; Personal-protective-equipment; Personal-protection; Isocyanates; Gloves; Air-flow; Ventilation; Respirators; Respiratory-equipment; Respiratory-protective-equipment; Respiratory-protection; Author Keywords: HETA 2004-0349-2970
7631-86-9; 14808-60-7; 14464-46-1
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American Industrial Hygiene Conference and Exposition, May 13-16, 2006, Chicago, Illinois
Page last reviewed: August 26, 2022
Content source: National Institute for Occupational Safety and Health Education and Information Division