# NIOSH Pocket Guide to Chemical Hazards
Glycidol | CAS 556-52-5
C3H6O2 | RTECS UB4375000
Synonyms & Trade Names 2,3-Epoxy-1-propanol; Epoxypropyl alcohol; Glycide; Hydroxymethyl ethylene oxide; 2-Hydroxymethyl oxiran; 3-Hydroxypropylene oxide | DOT ID & Guide
Exposure Limits | NIOSH REL: TWA 25 ppm (75 mg/m3)
OSHA PEL†: TWA 50 ppm (150 mg/m3)
IDLH 150 ppm | Conversion 1 ppm = 3.03 mg/m3
Physical Description Colorless liquid.
MW: 74.1 | BP: 320°F (Decomposes) | FRZ: -49°F | Sol: Miscible
VP(77°F): 0.9 mmHg | IP: ? |  | Sp.Gr: 1.12
Fl.P: 162°F | UEL: ? | LEL: ? |
Class IIIA Combustible Liquid: Fl.P. at or above 140°F and below 200°F.
Incompatibilities & Reactivities Strong oxidizers, nitrates
Measurement Methods NIOSH 1608; OSHA 7
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: No recommendation | First Aid (See procedures) Eye: Irrigate immediately Skin: Water wash promptly Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH Up to 150 ppm: (APF = 10) Any supplied-air respirator*/(APF = 50) Any self-contained breathing apparatus 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 organic vapor canister/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, nose, throat; narcosis
Target Organs Eyes, skin, respiratory system, central nervous system
See also: INTRODUCTION