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Recommendations for the study of control measures for overspray generated during bed liner application, report no. CT-294-05a.

Authors
Heitbrink-WA; Almaguer-D
Source
NIOSH 2003 Apr; :1-7
NIOSHTIC No.
20023098
Abstract
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.
Keywords
Control-technology; Engineering-controls; Exhaust-ventilation; Exposure-levels; Occupational-exposure; Polymers; Work-practices; Workplace-studies; Respiratory-protection; Region-10; Urethanes; Coatings
CAS No.
101-68-8
Publication Date
20030401
Document Type
Field Studies; Control Technology
Fiscal Year
2003
NTIS Accession No.
PB2003-106597
NTIS Price
A03
Identifying No.
CT-294-05a
NIOSH Division
DART
Priority Area
Research Tools and Approaches: Control Technology and Personal Protective Equipment
SIC Code
7549
Source Name
National Institute for Occupational Safety and Health
State
IA; OH; WA
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