# NIOSH Pocket Guide to Chemical Hazards
Phenyl ether-biphenyl mixture (vapor) | CAS 8004-13-5
C6H5OC6H5/C6H5C6H5 | RTECS DV1500000
Synonyms & Trade Names Diphenyl oxide-diphenyl mixture, Dowtherm® A | DOT ID & Guide
Exposure Limits | NIOSH REL: TWA 1 ppm (7 mg/m3)
OSHA PEL: TWA 1 ppm (7 mg/m3)
IDLH 10 ppm | Conversion 1 ppm = 6.79 mg/m3 (approx)
Physical Description Colorless to straw-colored liquid or solid (below 54°F) with a disagreeable, aromatic odor. [Note: A mixture typically contains 75% phenyl ether & 25% biphenyl.]
MW: 166 (approx) | BP: 495°F | FRZ: 54°F | Sol: Insoluble
VP(77°F): 0.08 mmHg | IP: ? |  | Sp.Gr(77°F): 1.06
Fl.P: 239°F | UEL: ? | LEL: ? |
Class IIIB Combustible Liquid: Fl.P. at or above 200°F.
Incompatibilities & Reactivities Strong oxidizers
Measurement Methods NIOSH 2013
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: Soap wash promptly Breathing: Respiratory support
Respirator Recommendations NIOSH/OSHA Up to 10 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode£/(APF = 50) Any chemical cartridge respirator with a full facepiece and organic vapor cartridge(s) in combination with a high-efficiency particulate filter/(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister having a high-efficiency particulate filter/(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s) in combination with a dust and mist filter£/(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 having a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin and/or eye contact
Symptoms Irritation eyes, nose, skin; nausea
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION