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Hydrogen selenide																				Related Pages
Synonyms & Trade Names
			Selenium dihydride, Selenium hydride
CAS No.
			7783-07-5
	RTECS No.
			MX1050000
	DOT ID & Guide
			2202 117(anhydrous)

FormulaH2Se
	Conversion
			1 ppm = 3.31 mg/m3
	IDLH
			1 ppmSee: 7783075

Exposure Limits
			NIOSH RELTWA 0.05 ppm (0.2 mg/m3)
					OSHA PEL TWA 0.05 ppm (0.2 mg/m3)
	Measurement Methods
			None available 
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless gas with an odor resembling decayed horseradish.
					[Note: Shipped as a liquefied compressed gas.]													
										
Molecular Weight81.0	
	Boiling Point-42°F
	Freezing Point-87°F
	Solubility(73°F): 0.9%
	Vapor Pressure(70°F): 9.5 atm
	Ionization Potential9.88 eV											
Flash PointNA (Gas)
	Upper Explosive Limit?
	Lower Explosive Limit?
	Relative Gas Density2.80
Flammable Gas
Incompatibilities & Reactivities
			Strong oxidizers, acids, water, halogenated hydrocarbons
Exposure Routes
			inhalation, skin and/or eye contact
Symptoms
			irritation eyes, nose, throat; nausea, vomiting, diarrhea; metallic taste, garlic breath; dizziness, lassitude (weakness, exhaustion); liquid: frostbite; In Animals: pneumonitis; liver damage
Target Organs
			Eyes, respiratory system, liver
										
Personal Protection/Sanitation
			(See protection codes) **Skin:**Frostbite
							**Eyes:**Frostbite
							**Wash skin:**No recommendation
							**Remove:**When wet (flammable)
							**Change:**No recommendation
							**Provide:**Frostbite wash
	First Aid
			(See procedures)**Eye:**Frostbite
							**Skin:**Frostbite
							**Breathing:**Respiratory support
Respirator Recommendations
			**NIOSH/OSHA****Up to 0.5 ppm**: (APF = 10) Any supplied-air respirator**Up to 1 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
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0284

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
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Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
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