# NIOSH Pocket Guide to Chemical Hazards
n-Propyl nitrate | CAS 627-13-4
CH3CH2CH2ONO2 | RTECS UK0350000
Synonyms & Trade Names Propyl ester of nitric acid | DOT ID & Guide 1865 131
Exposure Limits | NIOSH REL: TWA 25 ppm (105 mg/m3) ST 40 ppm (170 mg/m3)
OSHA PEL†: TWA 25 ppm (110 mg/m3)
IDLH 500 ppm | Conversion 1 ppm = 4.30 mg/m3
Physical Description Colorless to straw-colored liquid with an ether-like odor.
MW: 105.1 | BP: 231°F | FRZ: -148°F | Sol: Slight
VP: 18 mmHg | IP: 11.07 eV |  | Sp.Gr: 1.07
Fl.P: 68°F | UEL: 100% | LEL: 2% |
Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
Incompatibilities & Reactivities Strong oxidizers, combustible materials [Note: Forms explosive mixtures with combustible materials.]
Measurement Methods NIOSH S227 (II-3); OSHA 7
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet (flammable) Change: No recommendation | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash promptly Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 250 ppm: (APF = 10) Any supplied-air respirator Up to 500 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece 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 (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern¿/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms In animals: irritation eyes, skin; methemoglobinemia, anoxia, cyanosis; dyspnea (breathing difficulty), lassitude (weakness, exhaustion), dizziness, headache
Target Organs Eyes, skin, blood
See also: INTRODUCTION