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Alternative Paint Application System Evaluation

Alternative Paint Application System Evaluation

Summer 2002
by Jason Marshall, and Heidi Wilcox and Fred Youngs
The spray delivery system was evaluated by SSL. The lab conducted several performance and worker exposure evaluations under controlled conditions of both the EnviroCaddie TM and the aerosol cans. The laboratory conducted five different performance tests, ranging from total coating performance to drying rate to single pass performance and spray pattern.

Upon initial TURI review, the use of the EnviroCaddie TM for spray painting could offer improved performance and reduced worker exposure. To obtain more objective information to this effect, the SSL conducted several performance and worker exposure evaluations under controlled conditions of both the EnviroCaddie TM and the aerosol cans. The laboratory conducted five different performance tests, ranging from total coating performance to drying rate to single pass performance and spray pattern.

It appears that the performance of the EnviroCaddie TM was in fact better than that of traditional aerosol spray cans, with the potentially significant exception of the appearance of pits and craters on the surface of the finish and increased drying time requirements. The EnviroCaddie TM appears to provide superior coverage over shorter periods of time.

The SSL conducted controlled testing of the presence of specific volatile organic compounds (VOCs) and total VOCs after 2 and 10 seconds of spray from the EnviroCaddieTM and traditional aerosol spray cans. Specific VOC concentrations were determined using Draeger tubes, and total VOC concentrations were determined using an organic vapor monitor (OVM). More detailed descriptions of the methodology used can be obtained from the SSL. The following table summarizes the results obtained from laboratory analyses.

Delivery System
Time (sec)
Total VOC
Acetone
Ethyl Benzene
Toluene
Xylene
Traditional Aerosol Spray Can 2 570 2500 175 225 1000
  10 Not Tested Not Tested Not Tested Not Tested Not Tested
EnviroCaddieTM 2 1200 4500 185 210 875
  10 500-1100 >1200 >600 >400 >400
Measured in parts per million (ppm)
OSHA Time Weighted Average (TWA) Permissable Exposure Limits (PELs)
      1000 100 200 100

Detected air emissions from both the traditional aerosol spray can and the EnviroCaddieTM indicated significant levels of regulated toxic chemicals. In fact, the amount of acetone present in the EnviroCaddie TM emissions was almost twice that from the aerosol spray can. This increase may be due to the higher percentage of total VOCs due to acetone for the EnviroCaddie TM as opposed to the spray cans. Field evaluation of worker exposure have not yet been conducted. It is likely that because laboratory tests of emissions were conducted in a closed, controlled environment (one cubic foot enclosure), actual worker exposure levels will be lower, and will depend on the facility space, ventilation, etc.