MDI Concentrations During Application of Spray-On Truck Bed-Liners

Details

• Personal Author:
  Almaguer, Daniel ; Burroughs G ; Ernst M ; Kovein, Ronald J. ; Shulman S ; Streicher R
• Description:
  A study was conducted to evaluate potential worker exposures to 4,4'-diphenylmethane diisocyante (MDI) during the application of spray-on truck bed-liners. The Washington State Department of Labor and Industry recently observed MDI exposures in this industry and expressed concerns to NIOSH about excessive occupational asthma claims. The spray-on bed-liner industry is rapidly growing and dominated by small business entities. It has been estimated there are approximately 3000 bed-liner shops in the U.S. The process is analogous to undercoating and involves the application of an aerosolized two-part polyurethane or polyurea coating to the surface and walls of pick-up truck beds to provide a protective non-skid coating. Part A is a polymeric diisocyanate with varying percentages of MDI monomer, MDI prepolymer, and polymeric MDI. Part B is a polyol resin that reacts with the diisocyanate. The two components are pumped to a spray gun mixing chamber and sprayed at sufficient velocity to cause atomization. MDI samples were collected at six spray-on bed-liner facilities to determine MDI concentrations within the spray booths and adjacent areas. Samples were collected at a flow rate of 1 liter per minute (lpm) according to NIOSH Method #5525. The sampling train consisted of an impinger containing a solution of 1-(9-anthracenylmethyl)piperazine (MAP) reagent in butyl benzoate followed by a 37-mm two-piece filter cassette containing a glass fiber filter impregnated with solid MAP. Preliminary results indicate that MDI concentrations within the facilities ranged from non-detectable to 5.2 mg/m3, some exceeding the OSHA ceiling limit of 0.2 mg/m3. Applicators wore supplied-air respirators. These results show that ventilation must be improved before allowing relaxation of personal protective equipment requirements. [Description provided by NIOSH]
• Subjects:
  Aerosols Asthma Asthma, Occupational Engineering Occupational Exposure Occupational Health Paint Personal Protective Equipment Polymers Respiratory Protective Devices Safety Urethane Ventilation Workplace

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• Keywords:
  Bronchial-asthma Coatings Control-technology Engineering-controls Exhaust-ventilation Exposure-levels Occupational-exposure Personal-protective-equipment Respiratory-protection Sampling Spraying-equipment Trucking Urethanes Work-practices Workplace-studies

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• Publisher:
  American Industrial Hygiene Association
• Document Type:
  Text
• Genre:
  Abstract or Summary
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DART - Division of Applied Research and Technology
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  74
• NIOSHTIC Number:
  nn:20024812
• Citation:
  American Industrial Hygiene Conference and Exposition, May 8-13, 2004, Atlanta, Georgia. Fairfax, VA: American Industrial Hygiene Association, 2004 May; :74
• CAS Registry Number:
  Diphenylmethane diisocyanate (CAS RN 101-68-8)
• Federal Fiscal Year:
  2004
• NORA Priority Area:
  Research Tools and Approaches: Control Technology and Personal Protective Equipment
• Peer Reviewed:
  False
• Source Full Name:
  American Industrial Hygiene Conference and Exposition, May 8-13, 2004, Atlanta, Georgia
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:8e7703c4de106f0139849c545fcdde95bcaeafd8832c853869a8881e17bf2101dbc66786697dbab07b99aab84f7ba48e29c833810b560ad29b9671749f0475a1
• Download URL:
  https://stacks.cdc.gov/view/cdc/196429/cdc_196429_DS1.pdf
• File Type:
  [PDF - 1.67 MB ]