Correlation of Tests for Material Dustiness with Worker Exposure from the Bagging of Powders.
Heitbrink-WA; Todd-WF; Fischbach-TJ
NIOSH 1990 Sep:642-644
A study was conducted in a packaging room for a powdered acrylic resin production line in order to determine correlations between relative dustiness of powders and worker dust exposures. NIOSH Method 0500, using personal pumps working at 3.7 liters per minute (L/min), was used to test dust exposures of bagging machine operators. Resin dustiness was evaluated by two devices. The Heubach Dust Measurement appliance was operated under conditions of 20 grams of sample, a 4L/min flow rate, and 5 minute sampling time. The unit produced a repeated dust fall through a regulated airstream, and dust settled on a preweighed glass fiber filter from which it could be measured. The Midwest Research Institute (MRI) tester used a flow rate of 10.8L/min and sampling time of 10 minutes. This tester used a rotating cup which poured material into an enclosed space from which it was collected on a preweighed filter for analysis. Six different acrylic resins were tested, and potential correlations were analyzed in a regression model. Significant correlations were obtained for worker dust exposures and dustiness as determined by both testers. When 95% prediction intervals for individual dust exposures were analyzed for significance of lack of fit of the regression model to the data, it was noted that this was significant only for the MRI tester. Results indicated that variability in worker exposure data was responsible for the width of the prediction interval. The authors conclude that dustiness test results are correlated with worker dust exposure and can be used to predict exposure to within an order of magnitude, even before exposures occur.
NIOSH-Author; Workplace-studies; Dust-exposure; Dust-analysis; Acrylics; Airborne-dusts; Mathematical-models; Exposure-levels; Physical-properties; Occupational-exposure;
Proceedings of the VIIth International Pneumoconioses Conference