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Chemical Sampling Information (CSI)
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General Description

Synonyms: n-Heptane; Dipropyl methane

OSHA IMIS Code Number: 1371

Chemical Abstracts Service (CAS) Registry Number: 142-82-5

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: MI7700000

Department of Transportation Regulation Number (49 CFR 172.101) and 2012 Emergency Response Guidebook [4 MB PDF, 392 pages]: 1206 128

NIOSH Pocket Guide to Chemical Hazards - n-Heptane: Physical description, chemical properties, potentially hazardous incompatibilities, and more

Exposure Limits and Health Effects

Exposure Limit

Limit Values

HE Codes

Health Factors and Target Organs

OSHA Permissible Exposure Limit (PEL) - General Industry
See 29 CFR 1910.1000 Table Z-1

500 ppm (2,000 mg/m3) TWA

HE7

Dizziness, vertigo, incoordination, hilarity

HE16 Persistent gasoline taste in mouth

OSHA PEL - Construction Industry
See 29 CFR 1926.55 Appendix A

500 ppm (2,000 mg/m3) TWA

HE7

Dizziness, vertigo, incoordination, hilarity

HE16 Persistent gasoline taste in mouth

OSHA PEL - Shipyard Employment
See 29 CFR 1915.1000 Table Z-Shipyards

500 ppm (2,000 mg/m3) TWA

HE7

Dizziness, vertigo, incoordination, hilarity

HE16 Persistent gasoline taste in mouth

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL)

85 ppm (350 mg/m3) TWA

440 ppm (1,800 mg/m3) Ceiling
(15 minutes)

HE7

Lightheadedness, hilarity, dizziness, vertigo, incoordination
HE8 Semi-consciousness, unconsciousness
HE16 Irritation of the eyes, nose, throat, and skin; persistent gasoline taste in mouth

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV) (2001)

400 ppm (1,640 mg/m3) TWA

500 ppm (2,050 mg/m3) STEL

HE7

Dizziness, vertigo, incoordination, hilarity

HE16 Respiratory irritation, persistent gasoline taste in mouth
CAL/OSHA PELs

400 ppm (1,600 mg/m3) TWA

500 ppm (2,000 mg/m3) STEL

HE7

 Dizziness, vertigo, incoordination, hilarity
HE16 Respiratory irritation, persistent gasoline taste in mouth

National Toxicology Program (NTP) carcinogenic classification: Not listed

International Agency for Research on Cancer (IARC) carcinogenic classification: Not listed

U.S. Environmental Protection Agency (EPA) carcinogenic classification: Not classifiable as to human carcinogenicity

EPA Inhalation Reference Concentration (RfC): Not established

Agency for Toxic Substances and Disease Registry (ATSDR) Inhalation Minimal Risk Level (MRL): Not established

NIOSH Immediately Dangerous to Life or Health (IDLH) concentration: 750 ppm

Notes on Other Potential Health Effects and Hazards

  1. Vapor/air mixtures are explosive (NIOSH/IPCS 1997).

Date Last Revised: 09/06/2012

Literature Basis

Monitoring Methods used by OSHA

Laboratory Sampling/Analytical Method:
  • sampling media: Charcoal Tube (100/50 mg sections, 20/40 mesh)
    analytical solvent: (99:1) Carbon Disulfide:Dimethylformamide
    maximum volume: 4 Liters   
    maximum flow rate:     0.2 L/min
    current analytical method: Gas Chromatography; GC/FID
    method reference: NIOSH Analytical Method (NIOSH 1500 [127 KB PDF, 8 pages])
    method classification: Partially Validated

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