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Chemical Sampling Information (CSI)
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General Description

Synonyms: 1-naphthyl ester methyl carbamic acid; Methylcarbamate 1-naphthalenol; 1-Naphthyl N-methyl-carbamate; alpha-Naphthyl N-methyl-carbamate; Sevin®

OSHA IMIS Code Number: 0525

Chemical Abstracts Service (CAS) Registry Number: 63-25-2

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: FC5950000

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: 2757 151

NIOSH Pocket Guide to Chemical Hazards, Carbaryl: chemical description, physical properties, potentially hazardous incompatibilities, and more

Exposure Limits

OSHA Permissible Exposure Limit (PEL):
General Industry: 29 CFR 1910.1000 Z-1 Table -- 5 mg/m3 TWA

Construction Industry: 29 CFR 1926.55 Appendix A -- 5 mg/m3 TWA

Maritime: 29 CFR 1915.1000 Table Z-Shipyards -- 5 mg/m3 TWA
American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 5 mg/m3 TWA; Appendix A4 - Not Classifiable as a Human Carcinogen

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 5 mg/m3 TWA; Minimize Exposure During Pregnancy

Health Factors

Carcinogenic Classification:

International Agency for Research on Cancer (IARC): Group 3, not classifiable as to its carcinogenicity to humans

NIOSH Immediately Dangerous To Life or Health Concentration (IDLH): 100 mg/m3

Potential Symptoms: Miosis, blurred vision, tearing; rhinorrhea (nasal discharge); salivation; sweating; abdominal cramps, nausea, vomiting, diarrhea; tremor; dizziness; labored breathing (bronchoconstriction), cyanosis; convulsions; unconsciousness; respiratory failure; skin irritation; possible reproductive effects; delayed peripheral neuropathy (rare).

Health Effects: Cholinesterase inhibition (HE6); Nervous System Disturbances---Delayed peripheral neuropathy (HE7) Teratogen (HE5)

Affected Organs: Respiratory system, CNS, cardiovascular system, skin, blood cholinesterase, reproductive system


  1. In addition to inhibiting AChE, carbaryl also inhibits a neuropathy target esterase in nervous tissue that is associated with the development of a delayed neurotoxicity in rats, which has also been reported in humans after acute high-dose (500 mg/kg, oral) or chronic carbaryl exposure in someone taking a drug (cimetidine) that inhibits its metabolism.
  2. Metabolized in the liver by several cytochrome P450 isozymes to 5-hydroxycarbaryl (CYP1A1 and 1A2), 4-hydroxycarbaryl (CYP3A4 and 1A1) and carbaryl methylol (CYP2B6).
  3. An increased risk of non-Hodgkin lymphoma associated with carbamate pesticide use by farmers, especially carbaryl, has been reported.

Literature Basis:

  • NIOSH Pocket Guide to Chemical Hazards: Carbaryl.
  • International Chemical Safety Cards (WHO/IPCS/ILO): Carbaryl.
  • EPA Air Toxics Website: Carbaryl. U.S. Environmental Protection Agency Technology Transfer Network.
  • Branch, R.A. and Jacqz, E.: Subacute neurotoxicity following long-term exposure to carbaryl. Am. J. Med. 80(4): 741-745, 1986.
  • Dickoff, D.J., Gerber, O. and Turovsky, Z.: Delayed neurotoxicity after ingestion of carbamate pesticide. Neurology 37(7): 1229-1231, 1987.
  • Ehrich, M., Jortner, B.S. and Padilla, S.: Comparison of the relative inhibition of acetylcholinesterase and neuropathy target esterase in rats and hens given cholinesterase inhibitors. Fundam. Appl. Toxicol. 24(1): 94-101, 1995.
  • Pohanish, R.P. (editor): Carbaryl. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 1. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 484-486.
  • Tang, J., Cao, Y., Rose, R.L. and Hodgson, E.: In vitro metabolism of carbaryl by human cytochrome P450 and its inhibition by chlorpyrifos. Chem. Biol. Interact. 141(3): 229-241, 2002.
  • Zheng, T., Zahm, S.H., Cantor, KP. Weisenburger, D.D., Zhang, Y. and Blair A.: Agricultural exposure to carbamate pesticides and risk of non-Hodgkin lymphoma. J. Occup. Environ. Med. 43(7): 641-649, 2001.

Date Last Revised: 05/19/2004

Monitoring Methods used by OSHA

Laboratory Sampling/Analytical Method:

  • sampling media: OSHA Versatile Sampler (OVS-2) - 13 mm XAD-2 tube (270/140 mg sections, 20/60 mesh) with Glass Fiber Filter enclosed
    maximum volume: 60 Liters
    maximum flow rate: 1.0 L/min
    current analytical method: High Performance Liquid Chromatography; HPLC/UV
    method reference: OSHA Analytical Method (OSHA 63)
    method classification: Fully Validated
    note: OSHA personnel may obtain sampling tubes from the Salt Lake Technical Center.

Wipe Sampling Method:

  • sampling media: Glass Fiber Filter

Bulk Method:

  • Limit the amount of bulk submitted to one gram or one mL.