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Heptane

General Description

Synonyms: n-Heptane; Dipropyl methane

OSHA IMIS code: 1371

CAS number: 142-82-5

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method:
  • charcoal tube (100/50 mg sections, 20/40 mesh) 
  • maximum volume: 4 L
  • maximum flow rate: 0.2 L/min
  • current analytical method: gas chromatography; GC/FID 
  • analytical solvent: (99:1) carbon disulfide:dimethylformamide
  • method reference: NIOSH 1500 (partially validated)

Exposure Limits and Health Effects (Updated September 6, 2012)

Standard Set By Exposure Limit Health Effect Codes -- Health Effects and Target Organs

OSHA 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
100 ppm (600 mg/m3) TWA
Skin
HE7 -- dizziness, vertigo, incoordination, hilarity
HE16 -- persistent gasoline taste in mouth
NIOSH 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
ACGIH TLV® (1979) (all isomers) 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

Carcinogenic classification:

EPA Inhalation Reference Concentration (RfC): Not established

ATSDR Inhalation Minimal Risk Levels (MRLs): Not established

NIOSH IDLH concentration: 750 ppm

Notes on other potential health effects and hazards:

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

Partial reference list:

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Heptane, All Isomers. 2016.
  • NIOSH: Criteria for a Recommended Standard - Occupational Exposure to Alkanes (C5-C8). March 1977.
  • NIOSH: Occupational Health Guideline for Heptane. September 1978.
  • NIOSH/CEC/IPCS: International Chemical Safety Cards -  n-Heptane. November 4, 1997.

Chemical Sampling Information

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