ISOBUTYL ALCOHOL (ISOBUTANOL) | Occupational Safety and Health Administration

ISOBUTYL ALCOHOL (ISOBUTANOL)†

Chemical Identification
Chemical Identification
CAS #	78-83-1
Formula	C₄H₁₀O
Synonyms	IBA; isopropylcarbinol; 2-methyl-1-propanol

Physical Properties
Physical Properties
Physical description	Colorless, oily liquid with a sweet, musty odor.
Boiling point	227°F	Molecular weight	74.12
Freezing point/melting point	-162°F	Vapor pressure	9 mmHg
Flash point	82°F	Vapor density	2.55
Specific gravity	0.8	Ionization potential	10.12 eV
Lower explosive limit (LEL)	1.2%	Upper explosive limit (UEL)	10.9%
NFPA health rating	2	NFPA fire rating	3
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.)	1536
Sampling group	OVSG-2
Sampler/Sampling media	2 Anasorb 747 sampling tubes (6 mm glass tubes, the front tube contains 400 and the back 200 mg of sorbent) connected in series [SKC 226-82]
Sampling time^*	240 min
Sampling volume (TWA)^*	12 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 5001 (fully validated)
Notes	Separate tubes and seal each after sampling.
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	Detector tube	Detector tube
Model/Type	Gastec 116	Matheson-Kitagawa 8014-208U
Sampling information (see manufacturer instructions)	2 strokes, 1-150 ppm range, uncertainty 25% for 5-50 ppm, 16% for 50-150 ppm	3 strokes, approx 2-100 ppm range

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	100 ppm (300 mg/m³)	REL-TWA	50 ppm (150 mg/m³)	TLV-TWA	50 ppm [1973]	PEL-TWA	50 ppm (150 mg/m³)
PEL-STEL		REL-STEL		TLV-STEL		PEL-STEL
PEL-C		REL-C		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.		Notes:		Notes:		Notes:
Health factors: See NIH-NLM PubChem.		IDLH	1600 ppm
Carcinogenic classifications: Not listed		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 - Isobutanol NIOSH: Pocket Guide to Chemical Hazards - Isobutanol alcohol Literature References ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Isobutanol. See annual publication for most recent information.

Last Updated Date : 12/31/2020

Group Sampling Information
Sampling Media	Sampling Time (If there are exceptions they will be in Notes)	TWA Sampling Volume (If there are exceptions they will be in Notes)	TWA Flow Rate (If there are exceptions they will be in Notes)
2) Anasorb 747 sampling tubes (6 mm glass tubes, the front tube contains 400 and the back 200 mg of sorbent) connected in series [SKC 226-82]	240 min	12 L	0.05 L/min

Analytes Sampling Information
Analytes	IMIS Code	Wipe Sampling
n-Butyl alcohol	0460	No
sec-Butyl alcohol	0461	No
Ethyl alcohol	1060	No
Isobutyl alcohol	1536	No
Isopropyl alcohol	1560	No
Methyl alcohol*	1660	No
n-Propyl alcohol	2170	No

Notes

Immediately after sampling, separate the two sampling tubes to prevent post-sampling migration.

Request any (up to two (2)) of these analytes together.

Results for unrequested analytes in this group will be reported if significant amounts are found.

There is no need to contact SLTC before sampling.

*If this is your primary analyte of interest, sample for 60 min at 0.05 L/min (3L). If the relative humidity is >50% at 25°C, you can sample for 100 min at 0.05 L/min (5L).