Label abbreviations descriptions

METHYLAL (DIMETHOXY-METHANE) (DIMETHOXYMETHANE)†

Chemical Identification
CAS # 109-87-5
Formula
 

C₃H₈O₂
Synonyms
 

dimethoxymethane; formaldehyde dimethylacetal; methoxymethyl methyl ether; methylene dimethyl ether

Physical Properties
Physical description Colorless liquid with a chloroform-like odor.
Boiling point 111°F Molecular weight 76.1
Freezing point/melting point -157°F Vapor pressure 330 mmHg
Flash point -26°F (open cup) Vapor density 2.6
Specific gravity 0.86 Ionization potential 10.00 eV
Lower explosive limit (LEL) 1.6% Upper explosive limit (UEL) 17.6%
NFPA health rating 1 NFPA fire rating 3
NFPA reactivity rating 1 NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 1655
Sampling group
Sampler/Sampling media CSC tube (100/50 mg) [SKC 226-01]
Sampling time*
 

 
Sampling volume (TWA)*
 

1-3 L
Sampling flow rate (TWA)*
 

0.01 - 0.2 L/min
Sampling volume (STEL/Peak/C)*
 
 

 
Sampling flow rate (STEL/Peak/C)*
 
 

 
Analytical method instruments GC-FID
Method reference NIOSH 1611 (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.

Bulk/Wipe Method
Wipe Sampler/Sampling media
 
 

 
Bulk Method
 
 

 

On-Site Screening Techniques
Device Infrared spectrophotometer
Model/Type Miran 1A & 1B
Sampling information
(see manufacturer instructions) 		0.1 ppm@9.5 µm

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 (3100 mg/m³)

 REL-TWA
 
 

1000 ppm (3100 mg/m³)

 TLV-TWA
 
 

1000 ppm [1970]

 PEL-TWA
 
 

1000 ppm (3100 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
 
 

2200 ppm
Carcinogenic classifications: Not listed Notes:
 
 

10% of LEL
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 
 

 

Additional Resources and Literature References

Last Updated Date : 01/05/2021