DICHLOROMONOFLUOROMETHANE†

Chemical Identification
Chemical Identification
CAS # 75-43-4
Formula

CHCl₂F

Synonyms

dichlorofluoromethane; fluorodichloromethane; Freon21; Genetron21; Halon112; Refrigerant 21

Physical Properties
Physical Properties
Physical description Colorless gas with a slight, ether-like odor.
Boiling point 48°F Molecular weight 102.9
Freezing point/melting point -211°F Vapor pressure 1.6 atm at 70°F
Flash point Vapor density 3.57
Specific gravity 1.48 Ionization potential 12.39 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.) 0887
Sampling group
Sampler/Sampling media 2 CSC tubes (100/50 mg sections, 20/40 mesh) in series [SKC 226-01]
Sampling time*
Sampling volume (TWA)*

0.25-3L

Sampling flow rate (TWA)*

0.01-0.05 L/min

Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments GC-FID
Method reference NIOSH 2516 (fully validated)
Notes

Separate front and backup tubes to avoid migration

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 Infrared spectrophotometer
Model/Type Miran 1A & 1B
Sampling information
(see manufacturer instructions)
0.08 ppm@9.4μm
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 (4200 mg/m³)

REL-TWA

10 ppm (40 mg/m³)

TLV-TWA

10 ppm [1977]

PEL-TWA

10 ppm (42 mg/m³)

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

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

5000 ppm

Carcinogenic classifications: Not listed 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 - Dichlorofluoromethane

NIOSH: Pocket Guide to Chemical Hazards - Dichloromonofluoromethane

Literature References

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Dichlorofluoromethane. See annual publication for most recent information.

Last Updated Date : 01/29/2021