Label abbreviations descriptions

CHLORINE†

Chemical Identification
CAS # 7782-50-5
Formula

Cl₂
Synonyms

molecular chlorine; bleach

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.

* 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.

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

Additional Resources and Literature References

Last Updated Date : 04/26/2024