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Physical & Chemical Properties

This page is a review of the physical and chemical properties of mineral oils that affect lubrication. A few properties may have both physical and chemical effects. Recognition of these properties is useful for designing lubrication systems, choosing lubricating oils, diagnosing lubrication, friction and wear problems, and selecting appropriate testing methods. The material is limited to industrial lubricating and hydraulic mineral oils and is written for people entering the field of Tribology. We would like to thank the Society of Tribologists and Lubrication Engineers (STLE) for publishing this article.

In each section the authors have: defined each property according to the Organization For Economic Co-operation and Development (Reference 1); stated how the property is measured by ASTM methods (Reference 2); described its application to industrial lubrication; and used SI units given in "Standard Practice For The Use Of The International System of Units - Modernized" (Reference 3). The information came from many unnamed authors. However, we specifically wish to acknowledge the authors cited in the references, from whom most of the information was obtained. The reader is referred to the references for further details. We also acknowledge obtaining specific lubricant properties from the bulletins of several lubricant suppliers.

References

Table of Contents:
Viscosity
Units of Viscosity Measurements
Viscosity Index (VI)
VI Improvers
Viscosity Measurements
Viscosity Pressure Coefficient
Viscosity Shear Rates
Pour Point
Density
Specific Gravity
Thermal Expansion
Bulk Modulus or Compress ability

GASES IN MINERAL OIL
Dissolved Gases
Entrained Gases
Foam
Vapor Pressure
Flash Point
Thermal Conductivity
Thermal Capacity/Heat Capacity and Specific Heat
Electrical Conductivity/ Dielectric Strength
Surface Tension

Contaminants
Gaseous
Liquid
Solid Particulates
Semi-Solids

Contaminants Which Affect Chemical Properties
Water
Corrosive Liquids
Base Oil Composition
Base Oil Lubricating Properties

Additives to Improve the Chemical Properties of Oils
Oxidation Inhibitors
Rust Inhibitors
Dispersants and Detergents

Additives to Improve Boundary Lubrication
Performance
Anti-friction
Saponification Number
Anti-wear
Anti-scuff
Oxygen
Sulfur Compounds
Phosphorous Compounds
Chlorine Compounds

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