NIOSH Pocket Guide to Chemical Hazards

Propylene glycol monomethyl ether

CAS 107-98-2


RTECS UB7700000
Synonyms & Trade Names
Dowtherm® 209; 1-Methoxy-2-hydroxypropane; 1-Methoxy-2-propanol; 2-Methoxy-1-methylethanol; Propylene glycol methyl ether
DOT ID & Guide


NIOSH REL: TWA 100 ppm (360 mg/m3) ST 150 ppm (540 mg/m3)
OSHA PEL: none
IDLH N.D. See: IDLH INDEX Conversion 1 ppm = 3.69 mg/m3
Physical Description
Clear, colorless liquid with a mild, ethereal odor.
MW: 90.1
BP: 248°F
FRZ: -139°F (Sets to glass)
Sol: Miscible
VP(77°F): 12 mmHg
IP: ?

Sp.Gr: 0.96
Fl.P: 97°F
UEL(calc): 13.8%
LEL(calc.): 1.6%

Class IC Flammable Liquid: Fl.P. at or above 73F and below 100F.
Incompatibilities & Reactivities
Oxidizers, strong acids [Note: Hygroscopic (i.e., absorbs moisture from the air). May slowly form reactive peroxides during prolonged storage.]
Measurement Methods
NIOSH 2554; OSHA 99
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: No recommendation
Eyes: Prevent eye contact
Wash skin: No recommendation
Remove: When wet (flammable)
Change: No recommendation

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water wash
Breathing: Respiratory support
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations Not available.
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, nose, throat; headache, nausea, dizziness, drowsiness, incoordination; vomiting, diarrhea
Target Organs Eyes, skin, respiratory system, central nervous system
See also: INTRODUCTION   See ICSC CARD: 0551