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Naphthalene																				Related Pages
Synonyms & Trade Names
			Naphthalin, Tar camphor, White tar
CAS No.
			91-20-3
	RTECS No.
			QJ0525000
	DOT ID & Guide
			1334 133(crude or refined)2304 133(molten)

FormulaC10H8
	Conversion
			1 ppm = 5.24 mg/m3
	IDLH
			250 ppmSee: 91203

Exposure Limits
			NIOSH RELTWA 10 ppm (50 mg/m3) ST 15 ppm (75 mg/m3)
					OSHA PEL TWA 10 ppm (50 mg/m3) See Appendix G
	Measurement Methods
			**NIOSH** 1501;**OSHA** 35
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless to brown solid with an odor of mothballs.
					[Note: Shipped as a molten solid.]													
										
Molecular Weight128.2	
	Boiling Point424°F
	Melting Point176°F
	Solubility0.003%
	Vapor Pressure0.08 mmHg
	Ionization Potential8.12 eV											
Specific Gravity1.15	
	Flash Point174°F
	Upper Explosive Limit5.9%
	Lower Explosive Limit0.9%
Combustible Solid, but will take some effort to ignite.
Incompatibilities & Reactivities
			Strong oxidizers, chromic anhydride
Exposure Routes
			inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
			irritation eyes; headache, confusion, excitement, malaise (vague feeling of discomfort); nausea, vomiting, abdominal pain; irritation bladder; profuse sweating; jaundice; hematuria (blood in the urine), renal shutdown; dermatitis, optical neuritis, corneal damage
Target Organs
			Eyes, skin, blood, liver, kidneys, central nervous system
										
Personal Protection/Sanitation
			(See protection codes) **Skin:**Prevent skin contact
							**Eyes:**Prevent eye contact
							**Wash skin:**When contaminated
							**Remove:**When wet or contaminated
							**Change:**Daily
	First Aid
			(See procedures)**Eye:**Irrigate immediately
							**Skin:**Molten flush immediately/solid-liquid soap wash promptly
							**Breathing:**Respiratory support
							**Swallow:**Medical attention immediately
Respirator Recommendations
			**NIOSH/OSHA****Up to 100 ppm**: (APF = 10) Any air-purifying half-mask respirator with organic vapor cartridge(s) in combination with an N95, R95, or P95 filter. The following filters may also be used: N99, R99, P99, N100, R100, P100. Click here for information on selection of N, R, or P filters.*(APF = 10) Any supplied-air respirator***Up to 250 ppm**: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode*(APF = 50) Any air-purifying full-facepiece respirator equipped with organic vapor cartridge(s) in combination with an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters.(APF = 25) Any powered, air-purifying respirator with an organic vapor cartridge in combination 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 (gas mask) with a chin-style, front- or back-mounted organic vapor canister having an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters.Any appropriate escape-type, self-contained breathing apparatus
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0667
					  MEDICAL TESTS: 0152

			
							

			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
Personal Protection and Sanitation Codes
First Aid Procedures Follow NIOSH Facebook
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