# NIOSH Pocket Guide to Chemical Hazards
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 131
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 | 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 140°F and below 200°F.
Incompatibilities & Reactivities Oxidizers
Measurement Methods NIOSH 1501; OSHA 7
Personal Protection & Sanitation 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
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