Methylal
Synonyms & Trade Names
Dimethoxymethane, Formal, Formaldehyde dimethylacetal, Methoxymethyl methyl ether, Methylene dimethyl etherExposure Limits
NIOSH REL
TWA 1000 ppm (3100 mg/m3)OSHA PEL
TWA 1000 ppm (3100 mg/m3)Physical Description
Colorless liquid with a chloroform-like odor.Molecular Weight
76.1Boiling Point
111°FFreezing Point
-157°FSolubility
33%Vapor Pressure
330 mmHgIonization Potential
10.00 eVSpecific Gravity
0.86Flash Point
(oc) -26°FUpper Exposive Limit
13.8%Lower Explosive Limit
2.2%Incompatibilities & Reactivities
Strong oxidizers, acidsExposure Routes
inhalation, ingestion, skin and/or eye contactSymptoms
irritation eyes, skin, upper respiratory system; anesthesiaTarget Organs
Eyes, skin, respiratory system, central nervous systemPersonal Protection/Sanitation
(See protection codes)Skin:Prevent skin contact
Eyes:Prevent eye contact
Wash skin:When contaminated
Remove:When wet (flammable)
Change:No recommendation
First Aid
(See procedures)Eye:Irrigate immediately
Skin:Water flush promptly
Breathing:Respiratory support
Swallow:Medical attention immediately
Respirator Recommendations
NIOSH/OSHA
Up to 2200 ppm:
(APF = 10) Any supplied-air respirator
(APF = 50) Any self-contained breathing apparatus with a full facepiece
Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
Escape:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister
Any appropriate escape-type, self-contained breathing apparatus
- Page last reviewed:April 11, 2016
- Page last updated:April 11, 2016
- Content source:
- National Institute for Occupational Safety and Health (NIOSH) Education and Information Division