PENTANE†

Chemical Identification
CAS # 109-66-0
Formula

C₅H₁₂

Synonyms

n-pentane; normal pentane; amyl hydride

Physical Properties
Physical description Colorless liquid with a gasoline-like odor.
Boiling point 97°F Molecular weight 72.2
Freezing point/melting point -202°F Vapor pressure 420 mmHg
Flash point -57°F Vapor density 2.48
Specific gravity 0.63 Ionization potential 10.34 eV
Lower explosive limit (LEL) 1.5% Upper explosive limit (UEL) 7.8%
NFPA health rating 1 NFPA fire rating 4
NFPA reactivity rating 0 NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 1990
Sampling group OVSG-1
Sampler/Sampling media CSC tube (100/50 mg) [SKC 226-01]
Sampling time*

45 min

Sampling volume (TWA)*

2.25 L

Sampling flow rate (TWA)*

0.05 L/min

Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments GC-FID
Method reference OSHA 5000 (fully validated)
Notes
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
Sampler/Sampling media
Bulk Method
Bulk Method
 

 

On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
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
 

1000 ppm (2950 mg/m³)

REL-TWA
 

120 ppm (350 mg/m³)

TLV-TWA
 

1000 ppm [2013]

PEL-TWA
 

600 ppm (1800 mg/m³)

PEL-STEL
 

 

REL-STEL
 

 

TLV-STEL
 

 

PEL-STEL
 

 

PEL-C
 

 

REL-C
 

610 ppm (1800 mg/m³) [15 min]

TLV-C
 

 

PEL-C
 

 

Skin notation
 

N

Skin notation
 

N

Skin notation
 

N

Skin notation
 

N

Notes:

See 29 CFR 1910.1000 Table Z-1.

OSHA Construction and Maritime Industry PEL is 500 ppm (1500 mg/m3) as an 8-hr TWA. See 29 CFR 1926.55 Table 1 and 29 CFR 1915.1000 Table Z-Shipyards.

Notes:
 

 

Notes:
 

 

Notes:
 

 

Health factors:  See NIH-NLM PubChem. IDLH
 

1500 ppm

Carcinogenic classifications: Not listed Notes:
 

10% of LEL

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

 

Last Updated Date : 06/03/2022