NIOSH Pocket Guide to Chemical Hazards


CAS 626-17-5


RTECS CZ1900000
Synonyms & Trade Names
1,3-Benzenedicarbonitrile; m-Dicyanobenzene; 1,3-Dicyanobenzene; Isophthalodinitrile; m-PDN
DOT ID & Guide


NIOSH REL: TWA 5 mg/m3
OSHA PEL†: none
IDLH N.D. See: IDLH INDEX Conversion
Physical Description
Needle-like, colorless to white, crystalline, flaky solid with an almond-like odor.
MW: 128.1
BP: Sublimes
MLT: 324°F (Sublimes)
Sol: Slight
VP: 0.01 mmHg
IP: ?

Sp.Gr: 4.42
Fl.P: ?
UEL: ?
LEL: ?

Combustible Solid and a severe explosion hazard.
Incompatibilities & Reactivities
Strong oxidizers (e.g., chlorine, bromine, fluorine)
Measurement Methods
None available
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: Daily
Remove: When wet or contaminated
Change: Daily

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations Not available.
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Headache, nausea, confusion; in animals: irritation eyes, skin
Target Organs Eyes, skin, central nervous system