To compare exposure levels for Enviro Caddie and traditional spray paint.
Date Run:
07/12/2002
Experiment Procedure:
A 12" x 12" x 12" Acrylic Spray Chamber lined with paper towels was used to contain paint sprayed. Background levels for organic vapor were measured using an OVM, Thermo Environmental Instruments,Inc - Model 580 B. Dragger tubes were used to measure for Acetone, Ethyl Benzene, Toulene & Xylene. Paint was sprayed for 10 seconds into the acrylic chamber. A reading was taken with the OVM at T = 0, at T = 10 seconds and then when level (T ~ 2 minutes). The OVM reading was repeated for each of the 4 Dragger tube measurements. Paper towels were changed between spraying in order to reduce residual vapors. Temperature and humidity were recorded to be 78.2 F and 38%.
Trial Results:
The Enviro Caddie measurements for the Drager tubes for the four compounds resulted in levels exceeding the capabilities of the tubes. The results are listed in the table below.
Background Readings
Temperature 78.2
Humidity 38%
Date: July 12, 2002
Exposure Evaluation 1
Measurement Location:
Spray Chamber 12" x 12" x 12"
Acrylic lined with paper towels
3.5" x 4.5" opening in top of chamber for spraying
(2) 1/4 " holes for tubing and Dragger tubes, 1" from opening
Time: 10 sec EC
Analysis Method
OVM, Thermo Environmental Instruments,Inc - Model 580 B
Dragger tubes for Acetone, Ethyl Benzene, Toulene & Xylene
Background
OVM
0.9 ppm
Acetone
No Color Change
Ethyle Benzene
No Color Change
Toulene
No Color Change
Xylene
No Color Change
Enviro Caddie
OVM
initial (max)
508 ppm
10 sec
300 ppm
level
265 ppm
Acetone 10 pumps
> 1200 ppm
OVM
initial (max)
1064 ppm
10 sec
272 ppm
level
255 ppm
Ethyl Benzene 6 pumps
> 600 ppm
OVM
initial (max)
1096 ppm
10 sec
309 ppm
level
309 ppm
Toulene 5 pumps
> 400 ppm
OVM
initial (max)
1063 ppm
10 sec
242 ppm
level
232 ppm
Xylene 5 pumps
> 400 ppm
1 pump over max
Process
Paint was sprayed for 10 seconds into the acrylic chamber
A reading was taken with the OVM initially (max reading), at 10 seconds and then when level
This was done for each of the 4 Dragger tubes
Paper towels were changed between spraying in order to get a fresh reading
Success Rating:
A follow up test, usually based on company input.
Conclusion:
Due to the levels recorded for the Enviro Caddie exposure at 10 seconds, the testing was stopped and rescheduled for a latter date using a lower spray delivery time (Reduced from 10 to 2 seconds). The traditional spray system will also be evaluated at the 2 second spray time.
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