# NIOSH Pocket Guide to Chemical Hazards
o-Terphenyl | CAS 84-15-1
C6H5C6H4C6H5 | RTECS WZ6472000
Synonyms & Trade Names o-Diphenylbenzene; 1,2-Diphenylbenzene; 2-Phenylbiphenyl; 1,2-Terphenyl; ortho-Terphenyl; o-Triphenyl | DOT ID & Guide
Exposure Limits | NIOSH REL: C 5 mg/m3 (0.5 ppm)
OSHA PEL†: C 9 mg/m3 (1 ppm)
IDLH 500 mg/m3 | Conversion 1 ppm = 9.42 mg/m3
Physical Description Colorless or light-yellow solid.
MW: 230.3 | BP: 630°F | MLT: 136°F | Sol: Insoluble
VP(200°F): 0.09 mmHg | IP: 7.99 eV |  | Sp.Gr: 1.1
Fl.P(oc): 325°F | UEL: ? | LEL: ? |
Combustible Solid
Incompatibilities & Reactivities None reported
Measurement Methods NIOSH 5021
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: Daily Provide: Eyewash, Quick drench | First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH Up to 25 mg/m3: (APF = 5) Any dust and mist respirator£ Up to 50 mg/m3: (APF = 10) Any dust and mist respirator except single-use and quarter-mask respirators£/(APF = 10) Any supplied-air respirator£ Up to 125 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode£/(APF = 25) Any powered, air-purifying respirator with a dust and mist filter£ Up to 250 mg/m3: (APF = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Up to 500 mg/m3: (APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode 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 with a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, mucous membrane; thermal skin burns; headache; sore throat; in animals: liver, kidney damage
Target Organs Eyes, skin, respiratory system, liver, kidneys
See also: INTRODUCTION