SELECTING PERFORMANCE GREASE: Ten Crucial Questions. Presented 4-13-2006 By Don Oldiges. Principles of Selection. Manufacturer recommendations
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Demands on Grease Performance
Machinery that is idle for long periods.
Moving parts that are “Sealed for Life”
Surfaces that are exposed to extreme conditions.
Extending the life of worn components.
Sealant to minimize leakage
Sealant to minimize contamination
Rigidity holds it in place where its needed
Holds finely ground solid lubricants like moly or teflon.1: Know When to Use Grease
Pour Point Depressant
Solid Boundary Lubricants
Polyalpha Olefins (PAO)
BuyerWhat is Grease?
Lithium, Sodium, Barium, Calcium, Aluminum
Clay, Graphite, Silica
Polyurea, PTFE, Wax
All greases are not created equal, caution must be exercised when replacing or refilling a grease.
C = Usually compatible.
B = Borderline compatibility (probably incompatible).
I = Incompatible
Professional societies and organizations have established classifications for oil and grease. The most widely encountered are those of the following organizations:
MIL-G-3545High Temperature Grease
MIL-G-4343BGrease, Pneumatic System
MIL-G-7711General Purpose EP Grease
MIL-G-18458Wire Rope Grease
MIL-G-21164CGrease, Moly Disulfide
Category - H1Lubricants - General Incidental Contact
Category - H2Lubricants - General No Contact
Category - H3
Soluble Oils5: Know Any Special Requirements
Penetration is a measure of consistency of a grease to determine its plasticity.
ASTM D-217What is Penetration?
The shearing action in the test apparatus simulates the working of the grease in service.
The consistency is measured after 60 strokes and repeated after 10,000 or more strokes.
ASTM D-217-AGrease Shear StabilityMotor-Matic Grease Worker Test
The results are used to evaluate the EP characteristic of the lubricant by a load scar curve and weld point.
The procedure consists of a series of 10-second runs made at pre-selected and successively higher loads until the welding of the four balls occurs.
ASTM D-2783Four Ball EP Test
Drums or Totes