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Control technology and exposure assessment for occupational exposure to crystalline silica: stone monument manufacturing - Hirons Memorial Works, Inc., Mount Orab, Ohio, report no. CT-247-22.

Authors
Kurimo-RW; Blade-LM; Heitbrink-WA
Source
NIOSH 2003 Mar; :1-10
NIOSHTIC No.
20022451
Abstract
Worker exposure to crystalline silica was monitored during an abrasive blasting operation where stone monuments were being manufactured. A stencil was placed over the stone, and then abrasive blasting was used to produce the engravings by removing stone not covered by the stencil. The primary engineering control in use at this site was an exhausted enclosure with a face velocity of 160 fpm. Area and personal samples were collected during the survey to measure how much respirable silica was produced by this process. The geometric mean was 0.0071 mg/m3 in the breathing zone and 0.0026 mg/m3 for the area samples. The low concentrations appear to result from relatively effective engineering controls for the blasting operation, and, in addition, the blasting operation was performed only during part of the workday which resulted in less dust being generated. Further reductions in workers' exposures can be affected by enclosing the abrasive agent recycle chute, providing a vacuum for the worker to clean his clothing instead of using compressed air, and using a vacuum and/or wet wipe or water to remove dust from the completed monument and enclosure.
Keywords
Silica-dusts; Stone-processing; Stone-products; Abrasive-blasting; Abrasives; Respirable-dust; Engineering-controls; Environmental-control-equipment; Control-technology; Region-5; Exposure-levels; Air-sampling; Breathing-zone
CAS No.
14808-60-7
Publication Date
20030301
Document Type
Field Studies; Control Technology
Funding Type
Construction
Fiscal Year
2003
NTIS Accession No.
PB2003-103824
NTIS Price
A03
Identifying No.
CT-247-22
NIOSH Division
DART
SIC Code
3281
Source Name
National Institute for Occupational Safety and Health
State
OH
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