Improved Frictional Response Liner
Glass Tape bearings are manufactured by a filament winding process that results in a continuous fiberglass filament backing composition-ensuring excellent mechanical properties, especially fatigue resistance. The filament wound fiberglass structure uses a high strength, corrosion resistant epoxy resin as the matrix material. The high strength backing permits the use of a thin wall bearing (1/16" to 1/8" or 1.5 to 3.0mm). This can often reduce the size and weight of the finished bearing assembly. PolyLube Glass Tape bearings will support a dynamic bearing load of 7,000 PSI (48 MPa), while handling high radial and longitudinal stresses with a static bearing capacity of 70,000 PSI (483 MPa). This family of materials exhibits exceptional dimensional stability and performance predictability over wide temperature ranges (±325°F or -198 to 163°C).
Applications for PolyLube Glass Tape Bearings range from guide rod bearings to linear motion components to hydraulic pumps. Swashblock mounted bearings are ideal applications for the Glass Tape bearing material as long as application considerations are consistent with a mixed film condition.
The PolyLube bearing offers a more elastic, damage tolerant structure when compared to traditional metallic bearing materials. In addition, the Glass Tape bearing exhibits good cavitation resistance when subjected to high pressure fluids during cyclic conditions.
|Ultimate Compression Strength||70,000 PSI||483 MPa|
|Unit Load Limit PSI||7,000 PSI||48 MPa|
|Temperature Range (Standard Formulation)||±325 °F||-198 to 163 °C|
|Coefficient Of thermal Expansion||4.8 x 10-6 in/in/°F||8.69 x 10-6 m/m/°C|
|Thermal Conductivity||1.8-2.3 BTU•in/(hr•Ft2•°F)||.26 - .33 W/m*K|
|Water Absorption (2 Hours)||0.12%||0.12%|
|Water Absorption (24 Hours)||0.16%||0.16%|
|Maximum Velocity||80 SFM||0.41 m/s|
The PolyLube Glass Tape lined bearing is similar in backing construction when compared to its sister product- the MRP bearing; however, the difference in the construction of the liner material drives the variations in performance. The primary performance variations between the Glass Tape and the MRP bearing are that the MRP bearing has a lower coefficient of friction and will handle higher surface velocities. However, the Glass Tape bearing sacrifices some capabilities with a slightly lower dynamic and static load capacity.
These differences are driven from fact that the Glass Tape bearing uses a proprietary filled PTFE resin structure as opposed to the continuous PTFE filaments used in the MRP product. Two liner thicknesses are available with the 0.015" (0.38mm) thick liner being standard and a 0.030" (0.76mm) thick liner being available for unique applications. The 0.030" (0.76mm) thick liner is designed for applications where boring the inner diameter might be required in order to achieve tighter tolerances in an effort to address sizing and minor misalignment conditions.
Mechanical and Physical Properties
The PolyLube Glass Tape bearing can withstand static loads of approximately 70,000 PSI and 7,000 PSI (483 MPa and 48MPa) under dynamic loading. At these loading levels, minimum distortion will occur. For dry running applications, the maximum speed is approximately 80 surface feet per minute (0.41 m/s).
This bearing’s operating temperature range is ±325°F (-198 to 163°C). Maximum continuous operational surface temperature for the standard formulation is 325°F (163°C), depending upon load characteristics. The bearing has been heat stabilized at these temperatures, so that little dimensional change will occur in the bearing during operation. In a free state, the coefficient of expansion of the PolyLube Glass Tape bearing is approximately 4.8 x 10-6 in/in/°F (8.69 x 10-6 m/m/°C), lower than steel and most metals.
Any ratings are typical for design purposes. Your design parameters may affect final ratings. Consult with a Polygon sales engineer for guidance. 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.