|Exposure Limit||Limit Values||HE Codes||Health Factors and Target Organs|
|OSHA Permissible Exposure Limit (PEL)||Not established|
|National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL)||5 mg/m3 TWA||HE10||Lung changes that may lead to pulmonary fibrosis; chronic respiratory diseases such as pneumoconiosis and bronchitis|
|American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV)||Withdrawn in 2004|
|CAL/OSHA PEL||5 mg/m3 TWA|
Date Last Revised: 9/6/2012
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