CHLORINE†

Chemical Identification
Chemical Identification
CAS # 7782-50-5
Formula

Cl₂

Synonyms

molecular chlorine; bleach

Physical Properties
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
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]
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.

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

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

Available

On-Site Screening Techniques
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
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

0.1 ppm [2017]

PEL-TWA

0.5 ppm (1.5 mg/m³)

PEL-STEL REL-STEL TLV-STEL

0.4 ppm [2017]

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: 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

Additional Resources and Literature References
Additional Resources and Literature References

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.

Last Updated Date : 07/15/2022