iglide® G300
The iglide G300 material comprises a thermoplastic base material, a network of fibers and a mix of solid lubricant.
The thermoplastic alloy features very low friction values, good wear characteristics and temperature resistance.
The network of long fibers adds additional load capacity, while the solid lubricant reduces friction and forms
an optimum bearing surface with minimal abrasion.
The low wall-thickness of iglide G300 bearings ensures good heat conducting characteristics, resulting in higher
load capacity.
Special Characteristics of iglide G300
Maintenance free dry operation
Excellent wear resistance
Quiet operation
Vibration Dampening
Resistant to dust and dirt
Suited for rotating, oscillating and linear motion
Space saving
Cost effective
P x V Values
The maximum P x V value during dry operation is 28,600 (psi x fpm).
iglide G300 produces best results with high loads and low to medium speeds. If the bearing moves in a linear motion,
surface speeds up to 780 fpm are attainable.
iglide G300 bearings are designed for dry operation. Lubrication does, however, improve performance.
With continuous lubrication in oil and grease, water or other liquids such as milk or alkaline solutions, the permissible
surface speeds can be as much as three times. The permissible P x V value is increased respectively.
iglide G300 bearings offer excellent performance during oscillation with high or low load levels and are able
to accommodate angular displacements of 5 - 10° at high frequencies.
Maximum surface speed for iglide G300 (dry operation) in fpm.
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Rotating
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Oscillating
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Linear
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| Continuous |
195
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295
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780
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| Short Duration |
390
|
490
|
975
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Compressive Strength
The unit pressure of iglide G300 is given in Illustration X for different temperatures. For continuous operation
at 275°F, the maximum stress level is 8700 psi. Flanged bushings made from iglide G300 can accept the same
axial stress level
Coefficients of friction
During dry operation against steel the coefficient of friction for iglide G300 range between 0.09 and 0.21. With
slow operating speeds, the coefficient of friction will be lower, and for faster speeds, it tends to be higher.
(Illustration X).
Linear motion, again, is the exception, as even with high speeds a low coefficient of friction can be obtained.
Friction value is also affected by the magnitude of the applied load. With high loadings, friction values will
be low, while with low loads, friction values will be high.
iglide G300 has excellent start-up characteristics. Dynamic and static friction values are almost identical
During the initial operation phase, friction values are high, but then begin to decrease until they have reached
a constant value, emphasizing the significance of microscopic abrasion
Permanent lubrication with grease and oil, water or other liquids, reduces the friction value of iglide G300. If
appropriate surface speeds are reached, hydro-dynamic lubricant film is formed
Coefficient of friction for iglide G300 with steel
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Dry
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Grease
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Oil
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Water |
|
0.18 - 0.30
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0.09
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0.04
|
0.04 |
| Steel shaft: Hardness 50 HRC, Ra = 16 - 64 rms |
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Operating Temperatures
For short runs, i.e. approx. 4 hours, iglide G300 can support its load capacity up to 430°F. This could be
of significance for sub assemblies or complete units which have to routed through ovens for lacquering purposes.
Operating temperatures for iglide G300.
|
Wear
|
Continuous
|
Short |
|
Limit
|
Operation
|
Duration
|
|
175°F
|
240°F
|
390°F |
The maximum temperature for continuous operation is 275°, and above this the material becomes brittle and
includes a certain amount of creep. During operating temperatures up to 250°F wear is at an absolute minimum.
Wear occurs with higher temperatures and increases proportionately at increasing heat levels.
As a rule, surface temperatures during continuous operation are between 70°F and 100°F higher than ambient.
Following the start-up phase, a specific surface temperature is automatically obtained, which remains essentially
the same during the entire operation. If the duty cycle must be interrupted, the surface temperature quickly readjusts
following the new start-up phase
Bearing Life
iglide bearings give excellent performance during the most diverse applications with rotating, oscillating and
linear motion, The following examples are typical.
Rotating
iglide G300 bearings operate - abrasion free - in electrical window openers at temperatures ranging from 16°F
to 175°F.
iglide G300 bearings allow transport pumps, which are lubricated by the transported product, to achieve continuous
surface speeds of 780 fpm at load levels exceeding 218 psi.
Oscillating
iglide G300 bearings can achieve 10 million cycles in switches, which are activated by a moving elevator. No noticeable
abrasion occurs in spite of the cyclic movements.
Hardly any abrasion occurs with iglide G300 bearings in pedals of tractors under extreme dust and dirt conditions
as well as edge pressure, even after 400,000 cycles.
No abrasion is apparent after 100,000 open-and-close movements of a car door hinge, with a load capacity of 1,450
psi.
Linear
Concrete boring and sawing machines running axially iglide G300 bearings give very long life, even though they
are constantly surrounded by water mixed with concrete particles.
In pneumatic cylinders, iglide G300 bearings have the capacity to cover a distance of 9.7 million feet with minimum
abrasion (less than .004”.)
iglide G300 bearings are not well suited for fast rotating applications during dry operation. Continuous lubrication
should be applied for such applications.
Electrical Properties
iglide G300 bearings are electrically isolating. The specific resistance is >1013 OHM cm.
Radiation Resistance
Gamma rays with an intensity if 10 MRad have no measurable influence on wear. Intensities in excess of 10 MRad
can reduce mechanical properties by 50% of their initial values.
Vacuum
iglide G300 bearings can be used in a vacuum without special considerations.
Weather Resistance
iglide G300 is permanently resistance to ultra-violet radiation corrosion.
Chemical Resistance
iglide G300 bearings are non-soluble in standard organic solutions. They are totally resistant to alkali solvents
and to most moderately strong organic and inorganic acid solutions.
iglide G300 is resistant to most lubricant oils and greases. An extensive listing of chemical resistance is shown
on Page X.
Shaft Materials
The ideal shaft material for iglide G300 is hardened steel, to 50 RC, with a surface finish of Ra=32-60rms. Friction
as well as wear reach minimal levels with these combinations.
Surface finish influences the performance of the bearing. It is imperative to consider that excessively slippery
shafts cause stick-slip effect, which in turn may cause squeaking. It is necessary for the shaft to have a certain
roughness level in order to produce microscopic abrasion.
In such cases where the very high load capacity of iglide G300 bearings are not fully required, the following shaft
materials may be considered:
Mild steel
Chrome-plated steel
Anodized aluminum
Stainless steel
Specific types of plastics
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