DICHLORODIFLUOROMETHANE†

Chemical Identification
Chemical Identification
CAS # 75-71-8
Formula

CCl₂F₂

Synonyms

difluorodichloromethane; Fluorocarbon 12; Freon12; Genetron12; Halon122; Propellant 12; Refrigerant 12

Physical Properties
Physical Properties
Physical description Colorless gas with an ether-like odor at extremely high concentrations.
Boiling point -22°F Molecular weight 120.9
Freezing point/melting point -252°F Vapor pressure 5.7 atm
Flash point Vapor density 4.2
Specific gravity 1.35 at 59°F Ionization potential 11.75 eV
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating NFPA fire rating
NFPA reactivity rating NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 0871
Sampling group
Sampler/Sampling media
Sampling time*
Sampling volume (TWA)*
Sampling flow rate (TWA)*
Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments
Method reference
Notes

OSHA staff, please contact the SLTC before sampling (801) 233-4900.

Special requirements

* 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
On-Site Screening Techniques
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
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

1000 ppm (4950 mg/m³)

REL-TWA

1000 ppm (4950 mg/m³)

TLV-TWA

1000 ppm [1979]

PEL-TWA

1000 ppm (4950 mg/m³)

PEL-STEL REL-STEL TLV-STEL PEL-STEL
PEL-C REL-C TLV-C PEL-C

6200 ppm

Skin notation

N

Skin notation

N

Skin notation

N

Skin notation

N

Notes:

See 29 CFR 1910.1000 Table Z-1.

Notes: Notes: Notes:
Health factors:  See NIH-NLM PubChem. IDLH

15000 ppm

Carcinogenic classifications: TLV-A4 Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Dichlorodifluoromethane

NIOSH: Pocket Guide to Chemical Hazards - Dichlorodifluoromethane

Literature References

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Dichlorodifluoromethane. See annual publication for most recent information.
  • California Department of Health Services-Drinking Water Program: Drinking Water Notification Levels, 2005.
  • U.S. EPA Integrated Risk Information System: Dichlorodifluoromethane (CASRN 75-71-8).
  • Pohanish, R.P. (editor): Dichlorodifluoromethane. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 1. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 809-811.

Last Updated Date : 12/21/2020