| http://www.w3.org/ns/prov#value | - tion:When synthetic abrasives containing less than one percent free silica are used, the employer may substitute particulate or dust filter respirators that are approved by the National Institute of Safety and Health (NIOSH) and used according to chapter 296-842 WAC.(iii) The employer must ensure that employees, including machine tenders and abrasive recovery workers, working in areas where unsafe
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