Activity Assumed exposure Acceptable respirator(s) Work with hand tools only Using power tools with dust collection systems 50-500 ug/m3 (low) All respirators except disposable ones Using power tools w/o dust collection systems Working with lead mortar Lead burning Rivet busting Clean up dry expendable abrasives Moving abrasive blasting enclosures 500-2500 ug/m3 (medium) Full face respirator PAPR with a cape PAPR with full facepiece Supplied-air (airline) respirator with a continuous-flow regulator & a loose fitting facepiece with a cape Self-Contained Breathing Apparatus (SCBAs) Welding/cutting/torch burning Abrasive blasting More than 2500 ug/m3 (high) PAPR with a cape; PAPR with full facepiece Supplied-air (airline) respirator with a continuous-flow regulator & a loose fitting facepiece with a cape Self-Contained Breathing Apparatus (SCBAs)