American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 1 f/cc TWA; Fibers longer than 5 µm diameter <3 µm; aspect ration > 5:1 as determined by the membrane filter method @ 400-450X magnification (4-mm objective) phase contrast illumination. Appendix A3 - Confirmed Animal Carcinogen with Unknown Relevance to Humans (TLVs listed under Synthetic Vitreous Fibers - Glass, Rock, or Slag Wool Fibers)
National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 3 fibers/cm3 TWA (fibers with diameter < or = 3.5 µm & length > or = 10 µm.); 5 mg/m3 TWA (total)
Date Last Revised: 11/03/2005
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