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Pentaborane																				Related Pages
Synonyms & Trade Names
			Pentaboron nonahydride
CAS No.
			19624-22-7
	RTECS No.
			RY8925000
	DOT ID & Guide
			1380 135

FormulaB5H9
	Conversion
			1 ppm = 2.58 mg/m3
	IDLH
			1 ppmSee: 19624227

Exposure Limits
			NIOSH RELTWA 0.005 ppm (0.01 mg/m3) ST 0.015 ppm (0.03 mg/m3)
					OSHA PEL TWA 0.005 ppm (0.01 mg/m3) See Appendix G
	Measurement Methods
			None available 
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless liquid with a pungent odor like sour milk.													
										
Molecular Weight63.1	
	Boiling Point140°F
	Freezing Point-52°F
	SolubilityReacts
	Vapor Pressure171 mmHg
	Ionization Potential9.90 eV											
Specific Gravity0.62	
	Flash Point86°F
	Upper Explosive Limit?
	Lower Explosive Limit0.42%
Class IC Flammable Liquid: Fl.P. at or above 73°F and below 100°F.
Incompatibilities & Reactivities
			Oxidizers, halogens, water, halogenated hydrocarbons
					[Note: May ignite SPONTANEOUSLY in moist air. Corrosive to natural rubber. Hydrolyzes slowly with heat in water to form boric acid.]
Exposure Routes
			inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
			irritation eyes, skin; dizziness, headache, drowsiness, incoordination, tremor, convulsions, behavioral changes; tonic spasm face, neck, abdominal, limbs
Target Organs
			Eyes, skin, central nervous system
										
Personal Protection/Sanitation
			(See protection codes) **Skin:**Prevent skin contact
							**Eyes:**Prevent eye contact
							**Wash skin:**When contaminated
							**Remove:**When wet (flammable)
							**Change:**No recommendation
							**Provide:**Eyewash, Quick drench
	First Aid
			(See procedures)**Eye:**Irrigate immediately
							**Skin:**Soap wash immediately
							**Breathing:**Respiratory support
							**Swallow:**Medical attention immediately
Respirator Recommendations
			**NIOSH/OSHA****Up to 0.05 ppm**: (APF = 10) Any supplied-air respirator**Up to 0.125 ppm**: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode**Up to 0.25 ppm**: (APF = 50) Any supplied-air respirator that has a tight-fitting facepiece and is 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**Up to 1 ppm**: (APF = 1000) Any supplied-air respirator operated in a pressure-demand or other positive-pressure mode**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 concernAny appropriate escape-type, self-contained breathing apparatus
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0819

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
Introduction
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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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