NIOSH Pocket Guide to Chemical Hazards

Diethyl phthalate

CAS 84-66-2


RTECS TI1050000
Synonyms & Trade Names
DEP, Diethyl ester of phthalic acid, Ethyl phthalate
DOT ID & Guide


NIOSH REL: TWA 5 mg/m3
OSHA PEL†: none
IDLH N.D. See: IDLH INDEX Conversion
Physical Description
Colorless to water-white, oily liquid with a very slight, aromatic odor. [pesticide]
MW: 222.3
BP: 563°F
FRZ: -41°F
Sol(77°F): 0.1%
VP(77°F): 0.002 mmHg
IP: ?

Sp.Gr: 1.12
Fl.P(oc): 322°F
UEL: ?
LEL(368°F): 0.7%

Class IIIB Combustible Liquid; however, ignition is difficult.
Incompatibilities & Reactivities
Strong oxidizers, strong acids, nitric acid, permanganates, water
Measurement Methods
OSHA 104
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: No recommendation
Eyes: No recommendation
Wash skin: No recommendation
Remove: No recommendation
Change: No recommendation

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Wash regularly
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, dizziness, nausea; lacrimation (discharge of tears); possible polyneuropathy, vestibular dysfunc; pain, numbness, lassitude (weakness, exhaustion), spasms in arms & legs; in animals: reproductive effects
Target Organs Eyes, skin, respiratory system, central nervous system, peripheral nervous system, reproductive system
See also: INTRODUCTION   See ICSC CARD: 0258