SANTOLUBE OS-105 is a diphenyl ether derivative with exceptionally low volatility, good broad-temperature properties, and resistance to degradation from heat, oxygen, radiation, and chemical attack. SANTOLUBE OS-105 is therefore suitable for use in designing lubricants for high-temperature and adverse environments. In addition, this base fluid is compatible with most metals, plastics, and elastomers. SANTOLUBE 105 is considered essentially nontoxic, especially when proper hygienic practices are employed.