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KMID : 0895419990090010014
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Journal of Korean Society of Occupational and Enviromental Hygiene
1999 Volume.9 No. 1 p.14 ~ p.22
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Evaluation of Workplace Protection Factors for Some Half - Facepiece Respirators in Welding Workplace
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Abstract
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This study was conducted to evaluate workplace protection factors(WPF) for two half-facepiece respirators (HR-1, HR-2) in welding workplace and to provide data on the workplace performance of negative-pressure, half-facepiece respirators against airborne particulate contaminants. The outside iron oxide(Fe2O3) concentration of welding fume for the respirator HR-1 ranged from 0.177 to 12.508 ㎎/m with a geometric mean of 1.118 ㎎/㎥ and the HR-2 respirator showed a iron oxide range of 0.500 to 3.494 ㎎/㎥ with a geometric mean of 1.082 ㎎/㎥. But the inside oxide concentration of welding fume for the respirator HR-1 ranged from 0.002 to 0.364 ㎎/㎥ with a geometric mean of 0.019 ㎎/㎥ and the HR-2 respirator showed a iron oxide range of 0.012 to 0.639 ㎎/㎥ with a geometric mean of 0.041 ㎎/d ㎥
The iron oxide inside concentrations were significantly less than 5 ㎎/㎥(TLV) for both of respirators. The WPF were ranged from 3 to 3744 with a geometric mean of 60 for HR-1 and range from 2 to 129 a geometric mean of 26 for HR-2. And, in this study, the 5th percentile of the workplace protection factors for half-facepiece aspirators (HR-1, HR-2) were 11.2 and 7.1, respectively. The correlation relationship between the Quantative Fit Factors(QNFT) and the WPF for half-mask negative pressure respirators were 0.099 and 0.460.
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