NIOSH Pocket Guide to Chemical Hazards

Dimethylphthalate CAS 131-11-3
C6H4(COOCH3)2 RTECS TI1575000
Synonyms & Trade Names
Dimethyl ester of 1,2-benzenedicarboxylic acid; DMP
DOT ID & Guide
9188 171 (hazardous substance, n.o.s.)
Exposure
Limits
NIOSH REL: TWA 5 mg/m3
OSHA PEL: TWA 5 mg/m3
IDLH 2000 mg/m3 Conversion
Physical Description
Colorless, oily liquid with a slight, aromatic odor. [Note: A solid below 42°F.]
MW: 194.2
BP: 543°F
FRZ: 42°F
Sol: 0.4%
VP: 0.01 mmHg
IP: 9.64 eV

Sp.Gr: 1.19
Fl.P: 295°F
UEL: ?
LEL(358°F): 0.9%

Class IIIB Combustible Liquid; however, ignition is difficult.
Incompatibilities & Reactivities
Nitrates; strong oxidizers, alkalis & acids
Measurement Methods
OSHA 104
Personal Protection & Sanitation
Skin: No recommendation
Eyes: Prevent eye contact
Wash skin: No recommendation
Remove: No recommendation
Change: No recommendation

First Aid (See procedures)
Eye: Irrigate promptly
Skin: Wash regularly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA
Up to 50 mg/m3: (APF = 10) Any dust and mist respirator with a full facepiece
Up to 125 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode/(APF = 25) Any powered, air-purifying respirator with a dust and mist filter
Up to 250 mg/m3: (APF = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece
Up to 2000 mg/m3: (APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
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 with a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, upper respiratory system; stomach pain
Target Organs Eyes, respiratory system, gastrointestinal tract
See also: INTRODUCTION