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DU-B

Metal-Polymer Bronze Backed PTFE Plain Bearing
DU-B dry bearings with bronze backing are available as special sliding plates
GGB DU-B dry plain bearings with bronze backing and metal polymer composite materials
GGB DU-B Metal-polymer dry running special bearing
GGB DU-B metal-polymer bronze backed special bushing
GGB DU-B metal polymer composite dry thrust washers

Product's benefits

  • Material allows for simple assembly
    Simple assembly
  • Material helps reduce total system cost
    Reduced System Cost
  • Materials reduces size and weight
    Reduce size/weight
  • Materials offer quiet operation
    Quiet Operation
  • Material eliminates/reduces maintenance
    Maintenance Free Operation
  • Material operates well in corrosive environments
    Eliminate corrosion
  • Material operates well in dry environment
    Dry operation
  • Material provides dimensional stability
    Dimensional Stability

Characteristics

  • Very good wear and low friction performance over a wide range of loads, speeds and temperatures in dry running conditions
  • Suitable for lubricated applications
  • Suitable for linear, oscillating and rotating movements
  • Bronze back offers improved corrosion resistance in humid/saline environments
  • Approved to standard EN 1337-2 for structural bearings for civil engineering
  • Approved to standard DIN EN 1797 and ISO 21010 (Cryogenic Vessels – Gas/Material Compatibility) for piping, valves, fittings and other components in both gaseous and liquid oxygen for up to maximum temperature of 60°C and oxygen pressure of 25 bars. Contact GGB for further details
  • Tested acc. to ASTM E595/ECSS-Q-ST-70-02C - Outgassing properties of materials used in Spacecraft equipment
AVAILABILITY

Bearing forms available in standard dimensions

  • Cylindrical bushes
  • Flanged bushes
  • Sliding plates

Bearing forms made to order: standard forms in special dimensions, thrust washers, flanged thrust washers, half-bearings, special shapes obtained by stamping or deep drawing, customized bearing designs

Brochure
GGB DU® and DU-B - Metal-Polymer - Self-Lubricating Bearing Solutions
Datasheet
GGB DU-B - Metal-Polymer Bronze Backed PTFE Plain Bearing Material

Operating performance

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DU-B
Dry Operation Very Good
Lubricated Operation Good
Greased Operation Fair
Machinable Consult with Applications Engineer
RoHS Compliant Not compliant
Standard Sizes Available
Application Excellence
DP4-B
Good
Very Good
Good
Consult with Applications Engineer
Compliant
Not Available

Composition

  • Metal-Polymer Composite Material
  • Bronze Back + Porous Bronze Sinter +
  • PTFE + Lead

Technical specifications

  • General

    BEARING PROPERTIES Value Unit
    Maximum load, p
    - Static 140 20 000 N/mm2 psi
    - Dynamic 140 20 000 N/mm2 psi
    Operating Temperature
    - Min -200 -328 °C °F
    - Max 280 536 °C °F
    Coefficient of linear thermal expansion
    - Parallel to the surface 18 10 10-⁶/K 10-⁶/F
    - Normal to the surface 36 20 10-⁶/K 10-⁶/F
    Dry
    Maximum sliding speed, U 2.5 500 m/s fpm
    Maximum pU factor 1.8 50 000 N/mm² x m/s psi x fpm
    Coefficient of friction, f 0.02-0.25* 0.02-0.25*
    Oil Lubricated
    Maximum sliding speed, U 5.0 1 000 m/s fpm
    Maximum pU factor 5.0 143 000 N/mm² x m/s psi x fpm
    Coefficient of friction, f 0.02-0.12 0.02-0.12
    Recommendations
    Shaft surface roughness, Ra
    - Dry 0.3 - 0.5 12-20 µm µin
    - Lubricated ≤ 0.05 - 0.4 * ≤ 2 - 16 * µm µin
    Shaft surface hardness
    - Unhardened acceptable, improved bearing life > 200 HB
    For Superior Performance Value
    Dry DP4-B
    Oil Lubricated DP4-B
    Grease Lubricated DP4-B
    Water Lubricated DP4-B
    Process Fluid Lubricated DP4-B

* Depending on operating conditions

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