September 2010
NIOSH Publication Number 2010-168c

Propylene glycol monomethyl ether

Synonyms & Trade Names
Dowtherm® 209, 1-Methoxy-2-hydroxypropane, 1-Methoxy-2-propanol, 2-Methoxy-1-methylethanol, Propylene glycol methyl ether
CAS No.
107-98-2
RTECS No.
UB7700000
DOT ID & Guide
Formula
CH3OCH2CHOHCH3
Conversion
1 ppm = 3.69 mg/m3
IDLH
N.D.
See: IDLH INDEX
Exposure Limits
NIOSH REL
: TWA 100 ppm (360 mg/m3) ST 150 ppm (540 mg/m3)
OSHA PEL
†: none
Measurement Methods

NIOSH 99
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 73°F and below 100°F.
Incompatibilities & Reactivities
Oxidizers, strong acids [Note: Hygroscopic (i.e., absorbs moisture from the air). May slowly form reactive peroxides during prolonged storage.]
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
Personal Protection/Sanitation
(See protection codes)
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
Respirator Recommendations

Not available.

Important additional information about respirator selection

See also: INTRODUCTION   See ICSC CARD: 0551