Dustiness Testers as a Means of Evaluating the Dust Exposure Potential of Powders.
Heitbrink-WA; Cooper-TC; Todd-WF; O'Brien-DM
Powder and Bulk Solids Conference/Exhibit, Proceedings of the Technical Program, May 15-18, Rosemont, Illinois 1989:539-549
A comparison was made of two dustiness testers, the Heubachdust measurement appliance and the MRI dustiness tester used to determine the propensity of different powders to create airborne dust. Results of these tests were compared with field studies conducted at two bag filling and bag dumping operations. One site was the packaging room for a powdered acrylic resin production line, and the other was the area in a paint factory where bags of dry materials were emptied into mixing tanks. Some of the test parameters which must be controlled in dustiness testing included the flow rate, sampling time, the bulk density of the powder, and the vibrator setting. In these studies the flow rate used was 15 liters per minute and the sample was 100 grams of powder. At some locations the dustiness test results could be used to predict worker dust exposure. At other sites there was no relationship found between worker dust exposure and dustiness test results. The authors note that the dustiness test results need to be adjusted for the effect of drop height. Other variables such as work practices, equipment maintenance and process leakage may influence dust exposure. The effect of material dustiness on exposure may be confounded with other factors. The mechanism of dust generation in the dustiness tester may be different from the mechanism of dust generation in the process of interest.
Dust-exposure; Paint-manufacturing-industry; Occupational-exposure; Airborne-particles; Airborne-dusts; Air-quality-monitoring; Workplace-studies;
Powder and Bulk Solids Conference/Exhibit, Proceedings of the Technical Program, May 15-18, Rosemont, Illinois