CHLORINE | Occupational Safety and Health Administration

Physical Properties
Physical description	Greenish-yellow gas with a pungent, irritating odor.
Boiling point	-29°F	Molecular weight	70.9
Freezing point/melting point	-150°F	Vapor pressure	6.8 atm
Flash point		Vapor density	2.47
Specific gravity	1.424 at 59°F	Ionization potential	11.48 eV
Lower explosive limit (LEL)		Upper explosive limit (UEL)
NFPA health rating	4	NFPA fire rating	0
NFPA reactivity rating	0	NFPA special instruction	OX: Possesses oxidizing properties
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.)	0640
Sampling group
Sampler/Sampling media	Midget fritted glass bubbler (MFGB) containing sulfamic acid solution (0.1%) - Chlorine Sampling Solution [SLTC112SOL]; PTFE, 25 mm, 0.45 µm pore [SKC 225-17-04]; Polypropylene Support Pad, 25 mm, [SKC 225-2901], Conductive Polypropylene Cassette Blank, goblet style, black, 25 mm, [SKC 225-2257]
Sampling time^*	240 min
Sampling volume (TWA)^*	240 L
Sampling flow rate (TWA)^*	1 L/min
Sampling volume (STEL/Peak/C)^*	15 L
Sampling flow rate (STEL/Peak/C)^*	1 L/min
Analytical method instruments	ISE
Method reference	OSHA ID-101 (fully validated)
Notes	Chlorine containing compounds, such as hypochlorites and trichloroisocyanuric acid, can act as positive interferences. If they are expected in the workplace, use a PTFE membrane/polypropylene cassette as a prefilter, followed by the midget fritted glass bubbler (MFGB) containing 15 mL 0.1% Sulfamic Acid for Chlorine Collection. PTFE prefilter does NOT need to be sent in to SLTC for Chlorine analysis.
Special requirements	These media are prepared by SLTC as needed and are not available for immediate shipment. Please allow time for SLTC to prepare these media prior to sampling.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method	Available

On-Site Screening Techniques
Device	Detector tube	Detector tube	CMS Chip
Model/Type	Matheson-Kitagawa 8014-109SB	Gastec 8LA	Chlorine, 0.2-10 ppm range
Sampling information (see manufacturer instructions)	follow mfr instructions, approx 0.1-10 ppm range	0.5-5 strokes, 0.05-16 ppm range, uncertainty 16.4% for 0.5-2 ppm, 8.2% for 2-8 ppm

**Exposure Limits**
OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak		NIOSH REL Up to 10-hour TWA (ST) STEL (C) Ceiling		ACGIH TLV© 8-hour TWA (ST) STEL (C) Ceiling		CAL/OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak
PEL-TWA	1 ppm (3 mg/m³) [Construction and Maritime Industries only]	REL-TWA		TLV-TWA		PEL-TWA	0.5 ppm (1.5 mg/m³)
PEL-STEL		REL-STEL		TLV-STEL		PEL-STEL	1 ppm (3 mg/m³)
PEL-C	1 ppm (3 mg/m³) [General Industry only]	REL-C	0.5 ppm (1.45 mg/m³) [15 minutes]	TLV-C		PEL-C
Skin notation	N	Skin notation	N	Skin notation	N	Skin notation	N
Notes: See 29 CFR 1910.1000 Table Z-1 The OSHA PEL for an 8 hr time-weighted average applies to Construction and Maritime Industries only. See 29 CFR 1926.55 Table 1 and 29 CFR 1915.1000 Table Z-Shipyards		Notes:		Notes: Visit the ACGIH TLV site for specific data		Notes:
Health factors: See NIH-NLM PubChem.		IDLH	10 ppm
Carcinogenic classifications: TLV-A4		Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3: 1 ppm/3 ppm/20 ppm

NOAA: CAMEO Chemicals - Chlorine

NIOSH: Pocket Guide to Chemical Hazards - Chlorine

Literature References

ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Chlorine. See annual publication for most recent information.
Bhérer, L., Cushman, R., Courteau, J.P., Quévillon, M., Côté, G., Bourbeau, J., L'Archevéque, J., Cartier, A. and Malo, J.L.: Survey of construction workers repeatedly exposed to chlorine over a three to six month period in a pulpmill. II. Follow up of affected workers by questionnaire, spirometry, and assessment of bronchial responsiveness 18 to 24 months after exposure ended. Occup. Environ. Med. 51(4): 225-228, 1994.
Gautrin, D., Boulet, L.P., Boutet, M., Dugas, M., Bhérer, L., L'Archevéque, J., Laviolette, M., Côté, G. and Malo, J.L.: Is reactive airways dysfunction syndrome a variant of occupational asthma? J. Allergy Clin. Immunol. 93(1 Pt. 1): 12-22, 1994.
Kilburn, K.H.: Chlorine-induced damage documented by neurophysiological, neuropsychological, and pulmonary testing. Arch. Environ. Health 55(1): 31-37, 2000.