Recommendations for the study of control measures for overspray generated during bed liner application.
Heitbrink WA; Almaguer D
Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, EPHB 294-05a, 2003 Apr; :1-7
Walk-through surveys were conducted at the training facilities of two distributors of diisocyanate based elastomeric truck bed-liner products, and two shops that apply spray-on truck bed-liners. The spray-on bed-liner process involves the application of a protective coating to the bed of pick-up trucks or other surfaces. The objective of these walk-through surveys was to learn about the process and to develop recommendations for the development of measures to control polymeric diisocyanate exposures in the spray-on bed-liner industry. The bed-liner is applied as a two part resin. Part A is a polymeric diisocyanate with varying percentages of diphenylmethane diisocyante (MDI) isomers, MDI oligomers, and polymeric MDI. Part B is a polyol that reacts with the polymeric diisocyanate to form a tough, resilient elastomeric surface coating. This report describes the spray-on bed-liner process, proposes future studies, recommends control strategies, and presents an engineering control design concept. The conclusions report that worker exposures to overspray in the spray-on truck bed-liner industry can be reduced by using a combination of approaches involving improved transfer efficiency, ventilation, and work practices. Because the applicator is essentially using an aerosol generation device to apply a surface coating, some form of respiratory protection will always be prudent. Before developing this strategy, field trials and some experimentation are needed to identify the work tasks that cause overspray exposure and to evaluate the transfer efficiency of the spray process. The outcomes of these studies are needed to review the control strategies mentioned in the preceding sections. Finally, the efficacy of these recommendations should to be evaluated during field trials.
Control-technology; Engineering-controls; Exhaust-ventilation; Exposure-levels; Occupational-exposure; Polymers; Work-practices; Workplace-studies; Respiratory-protection; Region-10; Urethanes; Coatings
Field Studies; Control Technology
NTIS Accession No.
Research Tools and Approaches: Control Technology and Personal Protective Equipment
National Institute for Occupational Safety and Health