METHYL ALCOHOL (METHANOL)†

Chemical Identification
Chemical Identification
CAS # 67-56-1
Formula

CH₄O

Synonyms

carbinol; columbian spirits; methanol; pyroligneous spirit; wood alcohol; wood naphtha; wood spirit

Physical Properties
Physical Properties
Physical description Colorless liquid with a characteristic pungent odor.
Boiling point 147°F Molecular weight 32.1
Freezing point/melting point -144°F Vapor pressure 96 mmHg
Flash point 52°F Vapor density 1.11
Specific gravity 0.79 Ionization potential 10.84 eV
Lower explosive limit (LEL) 6.0% Upper explosive limit (UEL) 36%
NFPA health rating 1 NFPA fire rating 3
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.) 1660
Sampling group OVSG-2
Sampler/Sampling media 2 Anasorb 747 sampling tubes (6 mm glass tubes, the front tube contains 400 and the back 200 mg of sorbent) connected in series [SKC 226-82]
Sampling time*

60 min

Sampling volume (TWA)*

3 L (or 5 L when humidity is greater than 50%)

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 5001 (fully validated)
Notes
 

Separate tubes and seal each after sampling. 

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 Detector tube Detector tube Detector tube Detector tube Detector tube CMS Chip
Model/Type Gastec 111 Gastec 111 Gastec 111 Matheson-Kitagawa 8014-119SA Matheson-Kitagawa 8014-119U Methanol, 20-500 ppm range
Sampling information
(see manufacturer instructions)
0.5 to 4 strokes, 0.0004-4.5% range, uncertainty 25%; for 0.02-0.5%, 16% for 0.5-1.5% 1 to 2 strokes, 5-1000 ppm range, uncertainty 25% for 40-200 ppm, 16% for 200-1000 ppm 2 to 4 strokes, 0.2-56 ppm range, uncertainty 25% for 2-5 ppm, 16% for 5-20 ppm 1 stroke, 0.05-6% range 1 stroke, approx 20-1000 ppm range
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
 

200 ppm (260 mg/m³)

REL-TWA
 

200 ppm (260 mg/m³)

TLV-TWA
 

200 ppm [2008]

PEL-TWA
 

200 ppm (260 mg/m³)

PEL-STEL
 

 

REL-STEL
 

250 ppm (325 mg/m³)

TLV-STEL
 

250 ppm [2008]

PEL-STEL
 

250 ppm (325 mg/m³)

PEL-C
 

 

REL-C
 

 

TLV-C
 

 

PEL-C
 

1000 ppm

Skin notation
 

N

Skin notation
 

Y

Skin notation
 

Y

Skin notation
 

Y

Notes:
 

See 29 CFR 1910.1000 Table Z-1.

Notes:
 

 

Notes:
 

BEI®

Notes:
 

 

Health factors:  See NIH-NLM PubChem. IDLH
 

6000 ppm

Carcinogenic classifications: Not listed Notes:
 

 

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

200 ppm/1000 ppm/5000 ppm

Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Methanol

NIOSH: Pocket Guide to Chemical Hazards - Methyl alcohol

Literature References

 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Methanol. See annual publication for most recent information.
  • Finkelstein, Y. and Vardi, J.: Progressive parkinsonism in a young experimental physicist following long-term exposure to methanol. Neurotoxicology 23(4-5): 521-525, 2002.
  • Hageman, G., van der Hoek, J.A. and Faber, C.G.: Spastic paraparesis without optic atrophy after occupational methanol exposure. J. Neurol. 250(7): 876-877, 2003.
  • NIOSH. Occupational Health Guideline for Methyl Alcohol. September 1978.
  • NIOSH. Criteria for a Recommended Standard - Occupational Exposure to Methyl Alcohol. March 1976.

Last Updated Date : 01/05/2021