METHYLENE CHLORIDE (DICHLOROMETHANE)‡

Chemical Identification
Chemical Identification
CAS # 75-09-2
Formula
 

CH₂Cl₂

Synonyms
 

dichloromethane; methylene dichloride

Physical Properties
Physical Properties
Physical description Colorless liquid with a chloroform-like odor.
Boiling point 104°F Molecular weight 84.9
Freezing point/melting point -139°F Vapor pressure 350 mmHg
Flash point Vapor density 2.93
Specific gravity 1.33 Ionization potential 11.32 eV
Lower explosive limit (LEL) 13% Upper explosive limit (UEL) 23%
NFPA health rating 2 NFPA fire rating 1
NFPA reactivity rating 0 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.) 1730
Sampling group
Sampler/Sampling media ORBO™ 91 Carbosieve® S-III (130/65) [Supelco 20360]
Sampling time*
 

60 min

Sampling volume (TWA)*
 

3 L

Sampling flow rate (TWA)*
 
 

0.05 L/min

Sampling volume (STEL/Peak/C)*
 
 

 

Sampling flow rate (STEL/Peak/C)*
 
 

 

Analytical method instruments GC-FID
Method reference OSHA 80 (fully validated)
Notes
 
 

 

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 CMS Chip
Model/Type Methylene chloride, 10-200 ppm range
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
 
 

25 ppm [12.5 ppm Action Level]

REL-TWA
 
 

 

TLV-TWA
 
 

50 ppm [1997]

PEL-TWA
 
 

25 ppm (87 mg/m³)

PEL-STEL
 
 

125 ppm

REL-STEL
 
 

 

TLV-STEL
 
 

 

PEL-STEL
 
 

125 ppm (435 mg/m³)

PEL-C
 
 

 

REL-C
 
 

 

TLV-C
 
 

 

PEL-C
 
 

 

Skin notation
 
 

Y

Skin notation
 
 

Y

Skin notation
 
 

N

Skin notation
 
 

N

Notes:
 
 

See 29 CFR 1910.1052

Notes:
 
 

CARCINOGEN (Ca): REDUCE EXPOSURE TO LOWEST FEASIBLE CONCENTRATION. See Appendix A, NIOSH Potential Occupational Carcinogens.

Notes:
 
 

BEI®

Notes:
 
 

See also Section 5202.

Health factors:  See NIH-NLM PubChem. IDLH
 
 

2300 ppm

Carcinogenic classifications: IARC-2B, NIOSH-Ca, EPA-B2, NTP-R, OSHA-Ca, TLV-A3 Notes:
 
 

Ca

AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 
 

300 ppm/750 ppm/4000 ppm

Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Dicholoromethane

NIOSH: Pocket Guide to Chemical Hazards - Methylene chloride

Literature References

 
 

Last Updated Date : 01/05/2021