# NIOSH Pocket Guide to Chemical Hazards
Lithium hydride | CAS 7580-67-8
LiH | RTECS OJ6300000
Synonyms & Trade Names Lithium monohydride | DOT ID & Guide 1414 138 2805 138 (fused, solid)
Exposure Limits | NIOSH REL: TWA 0.025 mg/m3
OSHA PEL: TWA 0.025 mg/m3
IDLH 0.5 mg/m3 | Conversion
Physical Description Odorless, off-white to gray, translucent, crystalline mass or white powder.
MW: 7.95 | BP: Decomposes | MLT: 1256°F | Sol: Reacts
VP: 0 mmHg (approx) | IP: NA |  | Sp.Gr: 0.78
Fl.P: NA | UEL: NA | LEL: NA |
Combustible Solid that can form airborne dust clouds which may explode on contact with flame, heat, or oxidizers.
Incompatibilities & Reactivities Strong oxidizers, halogenated hydrocarbons, acids, water [Note: May ignite SPONTANEOUSLY in air and may reignite after fire is extinguished. Reacts with water to form hydrogen & lithium hydroxide.]
Measurement Methods OSHA ID121
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: Brush (DO NOT WASH) Remove: When wet or contaminated Change: Daily Provide: Eyewash, Quick drench (>0.5 mg/m3) | First Aid (See procedures) Eye: Irrigate immediately Skin: Brush (DO NOT WASH) Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 0.25 mg/m3: (APF = 10) Any air-purifying respirator with a high-efficiency particulate filter/(APF = 10) Any supplied-air respirator Up to 0.5 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode*/(APF = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/(APF = 25) Any powered, air-purifying respirator with a high-efficiency particulate filter*/(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 with 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; eye, skin burns; mouth, esophagus burns (if ingested); nausea; muscle twitches; mental confusion; blurred vision
Target Organs Eyes, skin, respiratory system, central nervous system
See also: INTRODUCTION