Amazing polyphenyl ethers used in the SR 71 for lubrication set new standards.

Polyphenyl ethers used in the SR 71 for lubrication are a class of lubricants having unusual properties, most significantly high thermal and radiation resistance, chemical stability, a high refractive index, and positional stability. They are most useful as robust lubricants in a variety of extreme environments.

In 1906, during the exciting early days of synthetic organic chemistry, a German researcher named F. Ullman set out to make diphenyl ether. By