SANTOLUBE OS-138 is a polyphenyl ether with exceptionally low volatility and

resistance to degradation from heat, oxygen, radiation, and chemical attack. It is

therefore well-suited for designing lubricants for applications that experience extreme

temperatures and other adverse environments. In addition, SANTOLUBE OS-138 is

compatible with most metals, plastics, and elastomers and is essentially nontoxic,

especially when proper hygienic practices are employed.

ATTRIBUTES

 Exceptionally Low Volatility  High Thermal Stability

 Resists Chemical Attack  High Surface Tension

 Resists Oxidation and Radiation Degradation  Excellent Resistance to Rust and Corrosion

 Prevents Noise and Fretting Wear  Protects Precious Metals

TYPICAL PHYSICAL AND PERFORMANCE PROPERTIES1

Appearance Clear, Colorless

Fluid

Corrosion and Oxidation Test - ASTM D 4636

(FTM 791-5307/5308) [600°F, 48h]

Viscosity at 40°C – ASTM D 445, cSt 1654 TAN Change 0

Viscosity at 100°C –ASTM D 445, cSt 23 Viscosity Change at 40°C None

Pour Point – ASTM D 97, °C 13 Metal Weight Change, mg

Flash point – ASTM D 92, °C 327 Steel 0.02

Refractive Index at 25°C 1.634 Silver 0.03

Thermal Stability up to °C 447 Copper 0.14

Surface Tension at 100°F, Dyne/cm 54.2 Aluminum 0.04

Precious Metals Compatibility Pass Titanium 0.02

Elastomer Compatibility – ASTM D 471

[Viton, Silicone, Teflon, Buna N] Pass Metals (Steel/Copper) Compatibility Pass