Industrial / Energy Fluids

Biphenyl (Diphenyl)

Used as a Heat Transfer Fluid as an Intermediate for organic chemicals.

Typical Properties

Physical Properties Test Method
Appearance, liquid Colorless to straw yellow liquid VISUAL
Appearance, solid White to straw-yellow, crystalline flakes VISUAL
Auto-ignition temperature 540°C1000°F --
Average Molecular Mass 154.2078 g/mol --
Boiling Point 254°C to 255°C489.2°F to 491°F ASTM D86
Critical Pressure 34.5 ± 10 atm507 ± 132 psia --
Critical Temperature 487°C to 527°C908.6°F to 980.6°F --
Density at 25°C (77°F), solid 1,040 kg/m38.68 pounds/gallon ASTM D1298
Biphenyl, % purity minimum 99.5% ASTM D2887
Flash Point Pensky-Martens Closed Cup 113°C245°F ASTM D93
Heat of Combustion, solid -4.05 x 104 ± 2 kJ/kg-174 x 104 ± 1 Btu/lb --
Heat of vaporization at 25°C 402 ± 65 kJ/kg172 ± 28 Btu/lb --
Melting Point / Freezing Point 69°C to 72°C156.2°F to 161.6°F --
Moisture, ppm maximum 300 ASTM D6304
Odor threshold, ppm 0.01 --
Specific gravity at 25°C/25°C (77°F/77°F) 1.0 ASTM D1298
Total acid number, mgKOH/g, maximum 0.01 ASTM D664
Total chlorides, ppm maximum 10 ASTM D5194
Total sulfur, ppm maximum 10

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