1. OSHA Occupational Chemical Database
  2. NAPHTHALENE
Label abbreviations descriptions

NAPHTHALENE†

Chemical Identification
Chemical Identification
CAS # 91-20-3
Formula
 

C₁₀H₈
Synonyms
 

diesel exhaust component; white tar; naphthalin; tar camphor
Physical Properties
Physical Properties
Physical description A white crystalline volatile solid with a strong coal-tar odor.
Boiling point 424°F Molecular weight 128.2
Freezing point/melting point 176°F Vapor pressure 0.08 mmHg
Flash point 174°F Vapor density 4.42
Specific gravity 1.15 Ionization potential 8.12 eV
Lower explosive limit (LEL) 0.9% Upper explosive limit (UEL) 5.9%
NFPA health rating 2 NFPA fire rating 2
NFPA reactivity rating 0 NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 1810
Sampling group
Sampler/Sampling media Chromosorb® 106 (100/50 mg) [SKC 226-110]
Sampling time*
 

50 min
Sampling volume (TWA)*
 

10 L
Sampling flow rate (TWA)*
 

0.2 L/min
Sampling volume (STEL/Peak/C)*
 

 
Sampling flow rate (STEL/Peak/C)*
 

 
Analytical method instruments GC-FID
Method reference OSHA 35 (fully validated)
Notes
 

Submit as a separate sample.
Special requirements
 

 

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Wipe Method
Wipe Method
Sampler/Sampling media
 

 
Bulk Method
Bulk Method
 

 
On-Site Screening Techniques
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
Exposure Limits
Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA
 

10 ppm (50 mg/m³)

 REL-TWA
 

10 ppm (50 mg/m³)

 TLV-TWA
 

10 ppm (52 mg/m³) [2013]

 PEL-TWA
 

0.1 ppm (0.5 mg/m³)
PEL-STEL
 

 

 REL-STEL
 

15 ppm (75 mg/m³)

 TLV-STEL
 

 

 PEL-STEL
 

 
PEL-C
 

 

 REL-C
 

 

 TLV-C
 

 

 PEL-C
 

 
Skin notation
 

N

 Skin notation
 

N

 Skin notation
 

Y

 Skin notation
 

Y
Notes:
 

See 29 CFR 1910.1000 Table Z-1.

 Notes:
 

 

 Notes:
 

 

 Notes:
 

 
Health factors:  See NIH-NLM PubChem. IDLH
 

250 ppm
Carcinogenic classifications: TLV-A4, EPA-CBD;C, IARC-2B, NTP-R Notes:
 

 
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 

 
Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Naphthalene

NIOSH: Pocket Guide to Chemical Hazards - Naphthalene

Literature References

 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Naphthalene. See annual publication for most recent information.
  • EPA: Hazard Summary - Naphthalene.
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Naphthalene. See annual publication for most recent information.
  • ATSDR: Toxicological Profile for Naphthalene, 1-Methylnaphthalene and 2-Methylnaphthalene. 2005.
  • Egeghy, P.P., Hauf-Cabalo, L., Gibson, R. and Rappaport, S.M.: Benzene and naphthalene in air and breath as indicators of exposure to jet fuel. Occup. Environ. Med. 60(12): 969-976, 2003.
  • EPA: Integrated Risk Information System - Napthalene. 1998.
  • IARC Monographs on Evaluation of Carcinogenic Risks to Humans, Volume 82, Naphthalene, 2002
  • Marczynski, B. et al.: Genotoxic risk assessment in white blood cells of occupationally exposed workers before and after alteration of the polycyclic aromatic hydrocarbon (PAH) profile in the production material: comparison with PAH air and urinary metabolite levels. Int Arch Occup Environ Health 78(2): 97-108, 2005.
  • NIOSH: Occupational Health Guideline for Naphthalene. September 1978.
  • NTP: Toxicology and carcinogenesis studies of naphthalene in B6C3F1 mice (inhalation studies). Technical Report Series No. 410. NIH Publication No. 92-3141. (1992).
  • NTP: Report on Carcinogens - Napthalene.
  • Preuss, R., Angerer, J. and Drexler, H.: Naphthalene - an environmental and occupational toxicant. Int. Arch. Occup. Environ. Health 76(8): 556-576, 2003.

Last Updated Date : 01/05/2021