TLV-CThreshold Limit Value - Ceiling (also seen as TLV/C)
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The odor threshold is 0.004 mg/[m.sup.3], the American Conference of Governmental Industrial Hygienists (ACGIH) threshold limit value ceiling (TLV-C) is 0.39 mg/[m.sup.3], the NIOSH recommended exposure limit ceiling (REL-C) is 0.40 [micro]g/ [m.sup.3], and the concentration NIOSH deems immediately dangerous to life and health (IDLH) is 2.0 [micro]g/[m.sup.3] (American Conference of Governmental Industrial Hygienists [ACGIH], 2008; NIOSH, 2007).
The TLV-C and REL-C for CS were developed to protect against "eye and respiratory irritation" and "damage to the respiratory epithelium" and should not be exceeded, even for instantaneous exposures (ACGIH, 1991; NIOSH, 1992).
Therefore, a concentration range bounded by the odor threshold and the TLV-C should demonstrate the mask's ability to shield the user from airborne chemical hazards while eliminating the potential for exposure to concentrations deemed excessive by ACGIH and NIOSH.