# NIOSH Pocket Guide to Chemical Hazards
Piperazine dihydrochloride | CAS 142-64-3
C4H10N2 • 2HCl | RTECS TL4025000
Synonyms & Trade Names Piperazine hydrochloride [Note: The monochloride, C4H10N2 HCl, is also commercially available.] | DOT ID & Guide
Exposure Limits | NIOSH REL: TWA 5 mg/m3
OSHA PEL†: none
IDLH N.D. | Conversion
Physical Description White to cream-colored needles or powder.
MW: 159.1 | BP: ? | MLT: 635°F | Sol: 41%
VP: ? | IP: ? |  | Sp.Gr: ?
Fl.P: ? | UEL: ? | LEL: ? |
Combustible Solid, but does not ignite easily.
Incompatibilities & Reactivities Water [Note: Slightly hygroscopic (i.e., absorbs moisture from the air).]
Measurement Methods None available
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: Daily Provide: Eyewash, Quick drench | First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations To be added later
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, respiratory system; skin burns, sensitization; asthma; gastrointestinal upset, headache, nausea, vomiting, incoordination, muscle weakness
Target Organs Eyes, skin, respiratory system, central nervous system
See also: INTRODUCTION