# NIOSH Pocket Guide to Chemical Hazards
Iodine | CAS 7553-56-2
I2 | RTECS NN1575000
Synonyms & Trade Names Iodine crystals, Molecular iodine | DOT ID & Guide
Exposure Limits | NIOSH REL: C 0.1 ppm (1 mg/m3)
OSHA PEL: C 0.1 ppm (1 mg/m3)
IDLH 2 ppm | Conversion 1 ppm = 10.38 mg/m3
Physical Description Violet solid with a sharp, characteristic odor.
MW: 253.8 | BP: 365°F | MLT: 236°F | Sol: 0.01%
VP(77°F): 0.3 mmHg | IP: 9.31 eV |  | Sp.Gr: 4.93
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Solid
Incompatibilities & Reactivities Ammonia, acetylene, acetaldehyde, powdered aluminum, active metals, liquid chlorine
Measurement Methods NIOSH 6005; OSHA ID212
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: Daily Provide: Eyewash (>7%), Quick drench (>7%) | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 1 ppm: (APF = 10) Any supplied-air respirator* Up to 2 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 acid gas canister having a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, nose; lacrimation (discharge of tears); headache; chest tightness; skin burns, rash; cutaneous hypersensitivity
Target Organs Eyes, skin, respiratory system, central nervous system, cardiovascular system
See also: INTRODUCTION