Phenyl ether-biphenyl mixture

Phenyl ether-biphenyl mixture (CAS 8004-13-5), commercially known as Dowtherm A or Diphyl, is a eutectic blend of diphenyl oxide and biphenyl engineered for high-temperature heat transfer applications.

It functions as a synthetic thermal fluid capable of operating across an exceptionally broad temperature range in both liquid and vapor phase systems. The primary use is in indirect heating systems for chemical processing.

The fluid circulates through jacketed reactors, reboilers, and distillation columns to deliver precise thermal control without pressurized steam infrastructure. In the petrochemical and refining sectors, it serves as the working fluid.

It is used in vapor-phase heating loops where uniform, high-temperature heat distribution is critical to process consistency. Specialty chemical and pharmaceutical manufacturers rely on it for temperature-controlled synthesis reactions.

These reactions require stable, controllable heat above 200°C. It also functions as a process solvent and carrier in select high-boiling applications where thermal stability under prolonged exposure is a procurement requirement.

Phenyl ether-biphenyl mixture is supplied as a clear liquid in bulk quantities, including ISO tank, drum, and IBC formats suited to industrial-scale procurement. It is available in technical grade for various uses.

Product specifications are typically aligned to established heat transfer fluid standards covering purity, boiling range, and thermal stability benchmarks. This ensures reliable performance in demanding industrial environments.