POLYLUBE® High Temp Bearings

A bearing designed for environments over 450°F or where thermal expansion stability is critical.

High Temperature Composite Bearing POLYLUBE® HT bearing is a high load, low RPM bearing designed for applications where self-lubrication is desired, but conventional composite bearing will not perform due to high temperatures. This product has been designed to provide excellent performance at elevated temperatures. With a glass transition temperature of over 450°F this epoxy filament wound structure exhibits superb performance over extended exposure to elevated temperatures. The bearing material is focused on applications where the bearing will be exposed to temperatures up to 450°F.

Commutator Rings

In addition to its high compressive properties (in both static and dynamic modes), this bearing material is inherently self-lubricating. The self-lubrication capability of Polygon Company's new material means that the use of expensive high temperature external lubricants are no longer necessary.

Properties

The POLYLUBE® HT bearing is a high strength, self-lubricating material that offers performance enhancements over greased systems, as well as graphite loaded bronze structures, some iron-copper graphites, polysulfone, PEEK®, and polyimide bearing materials.

Applications

Snowmobile

PolyLube High Temperature applications are not just for elevated temperature environments but also for applications where the bearing may need to resist thermal expansion during operation. One example of this is in snowmobile clutch markets. In these applications, the clutch speed goes from 0 to very high RPM’s in micro-seconds (and vice versa). During this cycling, friction is rising because speed is being dramatically increased. As the friction goes up so does the temperature of the associated components. A high temperature composite bearing material can resist these expansion phenomena and as a result offer better long term wear, improved bearing durability, and less seizure opportunity than conventional metal bearing materials.

Physical Properties*

Hoop Strength (Fy x 103) 120
Tensile Strength (Ft x 103) 20 PSI
Flexural Strength, Axial (Fbx x 103) 20 PSI
Poisson’s Ratio, Axial 0.08
Shear Modulus (Gxy x 106) 0.6 PSI
Elastic Modulus (Ex x 106) 0.6 PSI
Elastic Modulus, Transverse (Ey x 106) 5 PSI
Ultimate Compression Strength 70,000 PSI
Unit Load Limit 30,000 PSI**
Temperature Range ±200 °C
Water Absorption as % weight produced (2 hours) 0.12
Water Absorption as % weight produced (24 hours) 0.16
Specific Gravity 1.87
Maximum Velocity 10 sfm

* These are typical properties. Specific properties may vary, depending on the composite design for each application.

Electical Properties*

Insulation Resistance ohm/8” length 2.38 x 1012
Volume Resistivity 2.41 x 1015 ohm/cm
Surface Resistivity 2.92 x 1015 ohms
Dielectric Strength, Short Time Minimum 100 volts/mill
Dielectric Constant (60 cps) 4.15
Dissipation Factor (60 cps) 0.01
Power Factor @ 60 cps (100v pct mx) – as received 5
Power Factor @ 60 cps (100v pct mx) – at 100°C 10
Power Factor @ 60 cps (100v pct mx) – after 24 hrs at 100°F at 98% rel. hum. 10

* These are typical properties. Specific properties may vary, depending on the composite design for each application.

Thermal Properties

Thermal Conductivity BTU/hr/ft2/°F/in 1.8 to 2.3
Specific Heat 0.27 BTU/lb/°F
Coefficient of Thermal Expansion 5.0 to 7 x 106 in/in/°F
Heat Resistance, Continuous ±200 °C

* These are typical properties. Specific properties may vary, depending on the composite design for each application.

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Loading Guidelines

**Polygon's proprietary process of fiberglass filament winding results in exceptionally strong structures to support the PolyLube wear surface. Loading in excess of 30,000 PSI can be tolerated in specific applications. A more general design approach for applications with oscillating pins and angular force vector change less than 45 degrees should be designed to an average working pressure of 8,000 psi. Polygon MRP and Fiber bearings will allow pressure spikes as high as 12,000 PSI during approximately 5% of the operational life.

Applications running with a stationary pin and a a fully rotational bearing should be designed to a an average working pressure of 6,000 psi. In these applications, Polygon's MRP and Fiber bearings will allow pressure spikes as high as 10,000 PSI during approximately 5% of operational life.

Please consult with a Polygon Application Engineer for any questions regarding loading conditions and bearing performance.

Disclaimer

Any ratings are typical for design purposes. Final testing and approval is the customer's responsibility for their application. This information is derived from our testing and published data. There is no assurance of these properties, or warranty provided that these products are suitable for any particular purpose or operational situation.

Polygon certifies that their product will be free from material defect. Polygon will not accept any liability for loss, damages, or costs from use or misuse of our products.

Specifications are subject to change, and may be affected by our continual process of improvement. Changes may be made without prior announcement.