NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

p-tert-Butyltoluene

CAS
98-51-1

(CH3)3CC6H4CH3

RTECS
XS8400000
Synonyms & Trade Names

4-tert-Butyltoluene, 1-Methyl-4-tert-butylbenzene
DOT ID & Guide
2667 / 152

Exposure
Limits

NIOSH REL: TWA 10 ppm (60 mg/m3) ST 20 ppm (120 mg/m3)
OSHA PEL: TWA 10 ppm (60 mg/m3)
IDLH
100 ppm See: 98511
Conversion
1 ppm = 6.07 mg/m3
Physical Description
Colorless liquid with a distinct aromatic odor, somewhat like gasoline.
MW: 148.3
BP: 379°F
FRZ: -62°F
Sol: Insoluble
VP(77°F): 0.7 mmHg
IP: 8.28 eV

Sp.Gr: 0.86
Fl.P: 155°F
UEL: ?
LEL: ?

Class IIIA Combustible Liquid: Fl.P. at or above 140F and below 200F.
Incompatibilities & Reactivities

Oxidizers
Measurement Methods
NIOSH 1501; OSHA 7
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: No recommendation

First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Water flush promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
NIOSH/OSHA
Up to 100 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode
(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s)
(APF = 50) Any chemical cartridge respirator with a full facepiece and organic vapor cartridge(s)
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece
Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
Escape:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister/Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
Irritation eyes, skin; dry nose, throat; headache; low blood pressure, tachycardia, abnormalities cardiovascular system stress; central nervous system, hematopoietic depression; metallic taste; liver, kidney injury
Target Organs
Eyes, skin, respiratory system, cardiovascular system, central nervous system, bone marrow, liver, kidneys
See also: INTRODUCTION   See MEDICAL TESTS: 0034