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