Factor vapors < 0.1 mm Hg 0.1 to 1 > 1 to 10 > 10 to 100 > 100 mmHg (Pvap) mmHg mmHg mmHg Dry and fine Dry and Dry and fine Coarse, bulk or Coarse and powdered particle size particulate material 1- to wet material dry material material < 10 100 µm > 100 µm µm Dermal absorption Large molecules Chemical Chemical Chemical Known as a (MW > 400 known to known as a known as a dermally g/mol) produce skin significant skin dermally absorbed irritation and eye absorbed chemical from irritant chemical in vivo animal from in vitro studies; “Skin” studies; designation “Skin” designation Ratio of OT/OEL* < 0.1 0.1 to 0.5 > 0.5 to 1 > 1 to 2 2 ≥ Adequate control Adequate Adequate Inadequate No control at Hazard control measure with regular control with control control; all; very dusty maintenance irregular without dusty maintenance maintenance; moderately dusty Amount used per Almost negligible Little amount Medium Large Large amount week amount used used amount used, amount used, workers workers are used, are not trained on workers are trained on handling the trained on handling the chemical handling the chemical chemical Duration of work per < 8 hrs 8 to 16 hrs 16 to 24 hrs 24 to 32 hrs 32 to 40 hrs week occupational exposure limit * Odor threshold (OT) divided by the (OEL) The likelihood of exposure to a chemical is largely determined by the presence of engineering controls and effectiveness. A properly designed and well-constructed local exhaust system will greatly reduce the exposure risk, whereas an open process or poorly designed and maintained system can result
Factor vapors (Pvap) < 0.1 mm Hg 0.1 to 1 mmHg > 1 to 10 mmHg > 10 to 100 mmHg > 100 mmHg particulate Coarse, bulk or wet material Coarse and dry material Dry and particle size > 100 µm Dry and fine material 1- to 100 µm Dry and fine powdered material < 10 µm Dermal absorption Large molecules (MW > 400 g/mol) Chemical known to produce skin irritation Chemical known as a significant skin and eye irritant Chemical known as a dermally absorbed chemical from in vitro studies; “Skin” designation Known as a dermally absorbed chemical from in vivo animal studies; “Skin” designation Ratio of OT/OEL* < 0.1 0.1 to 0.5 > 0.5 to 1 > 1 to 2 ≥ 2 Hazard control measure Adequate control with regular maintenance Adequate control with irregular maintenance Adequate control without maintenance; moderately dusty Inadequate control; dusty No control at all; very dusty Amount used per week Almost negligible amount used Little amount used Medium amount used, workers are trained on handling the chemical Large amount used, workers are trained on handling the chemical Large amount used, workers are not trained on handling the chemical Duration of work per week < 8 hrs 8 to 16 hrs 16 to 24 hrs 24 to 32 hrs 32 to 40 hrs * Odor threshold (OT) divided by the occupational exposure limit (OEL) The likelihood of exposure to a chemical is largely determined by the presence of engineering controls and effectiveness. A properly designed and well-constructed local exhaust system will greatly reduce the exposure risk, whereas an open process or poorly designed and maintained system can result
Risk-Assessment_Guide_Chem.docx