# NIOSH Pocket Guide to Chemical Hazards
Allyl propyl disulfide | CAS 2179-59-1
H2C=CHCH2S2CH2CH2CH3 | RTECS JO0350000
Synonyms & Trade Names 4,5-Dithia-1-octene; Onion oil; 2-Propenyl propyl disulfide; Propyl allyl disulfide | DOT ID & Guide
Exposure Limits | NIOSH REL: TWA 2 ppm (12 mg/m3) ST 3 ppm (18 mg/m3)
OSHA PEL†: TWA 2 ppm (12 mg/m3)
IDLH N.D. See: IDLH INDEX | Conversion 1 ppm = 6.07 mg/m3
Physical Description Pale-yellow liquid with a strong & irritating onion-like odor. [Note: The chief volatile component of onion oil.]
MW: 148.3 | BP: ? | FRZ: 5°F | Sol: Insoluble
VP: ? | IP: ? |  | Sp.Gr(59°F): 0.93
Fl.P: ? | UEL: ? | LEL: ? |
Combustible Liquid
Incompatibilities & Reactivities Oxidizers
Measurement Methods None available
Personal Protection & Sanitation Skin: No recommendation Eyes: Prevent eye contact Wash skin: No recommendation Remove: When wet or contaminated Change: No recommendation | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations To be added later
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, nose, respiratory system; lacrimation (discharge of tears)
Target Organs Eyes, respiratory system
See also: INTRODUCTION