NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Dimethylphthalate

CAS
131-11-3

C6H4(COOCH3)2

RTECS
TI1575000
Synonyms & Trade Names

Dimethyl ester of 1,2-benzenedicarboxylic acid; DMP
DOT ID & Guide

Exposure
Limits

NIOSH REL: TWA 5 mg/m3
OSHA PEL: TWA 5 mg/m3
IDLH
2000 mg/m3 See: 131113
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
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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 air-purifying full-facepiece respirator equipped with an N95, R95, or P95 filter. The following filters may also be used: N99, R99, P99, N100, R100, P100. Click here for information on selection of N, R, or P filters.
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 high-efficiency particulate filter.
Up to 250 mg/m3:
(APF = 50) Any air-purifying, full-facepiece respirator with an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters.
(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 an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters./Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
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   See ICSC CARD: 0261   See MEDICAL TESTS: 0086