GGB HI-EX Cylindrical Bushes

HI-EX® Metal-Polymer Hydrodynamic Composite Bearings

CHARACTERISTICS

  • Marginally lubricated composite bearing material with good wear resistance under thin film conditions
  • Standard bearings supplied with indents for optimum retention and distribution of the lubricant over the sliding layer
  • Available with non-indented overlay for hydrodynamic applications
  • Rated for high temperature use up to 250°C / 480°F
  • Suitable for use with low viscosity fluids
  • Good chemical resistance
  • Lead-free material compliant to EVL, RoHS and WEEE specifications

availability

Bearing forms made to order: cylindrical bushes, thrust washers, sliding plates, half-bearings, special shapes obtained by stamping, bearings with locating notches, lubricant holes and machined grooves, customized bearing designs

STRUCTURE AND COMPOSITION

  • Metal-Polymer Composite Material 
  • Steel Back + Porous Bronze Sinter +
  • PEEK + PTFE + Fillers

MICROSECTION

 

 

Sliding layer
PEEK + PTFE +
Fillers

Porous Bronze
Sinter

Steel Back

 

OPERATING PERFORMANCE
Dry Fair
Oil lubricated Good
Grease lubricated Very Good
Water lubricated Good
Process fluid lubricated Good
FOR SUPERIOR PERFORMANCE
Dry

GAR-MAX / HSG / GAR-FIL / MLG

HI-EX® bearing material is known by various names such as Hi Ex. Buying a HI-EX® bearing from GGB or its authorized distributors guarantees that you do not receive a counterfeit product.  

BEARING PROPERTIES

GENERAL   Unit Value
Maximum load, p

Static

Dynamic

N/mm2

N/mm2

140

140

Operating temperature

Min

Max

°C

°C

- 150

250

Coefficient of linear thermal expansion

Parallel to the surface

Normal to the surface

10-6/K

 

10-6/K

11

 

29

GREASE Lubricated      
Maximum sliding speed, U   m/s 2.5
Maximum pU factor

 

N/mm2 x m/s

2.8

Coefficient of friction     0.08 - 0.12
OIL LUBRICATED      
Maximum sliding speed, U   m/s 10.0
Maximum pU factor   N/mm2 x m/s 10.0
Coefficient of friction     0.03 - 0.08
RecommEndations      
Shaft surface roughness, Ra

 

µm

≤ 0.05 – 0.40 *

Shaft surface hardness

Normal

For longer service life

HB

HB

> 200

> 350

* Depending on operating conditions

STRUCTURE AND COMPOSITION

  • Metal-Polymer Composite Material 
  • Steel Back + Porous Bronze Sinter +
  • PEEK + PTFE + Fillers

MICROSECTION

 

 

Sliding layer
PEEK + PTFE +
Fillers

Porous Bronze
Sinter

Steel Back

 

OPERATING PERFORMANCE
Dry Fair
Oil lubricated Good
Grease lubricated Very Good
Water lubricated Good
Process fluid lubricated Good
FOR SUPERIOR PERFORMANCE
Dry

GAR-MAX / HSG / GAR-FIL / MLG

HI-EX® bearing material is known by various names such as Hi Ex. Buying a HI-EX® bearing from GGB or its authorized distributors guarantees that you do not receive a counterfeit product.  

BEARING PROPERTIES

GENERAL   Unit Value
Maximum load, p

Static

Dynamic

psi

psi

20 000

20 000

Operating temperature

Min

Max

°F

°F

- 240

480

Coefficient of linear thermal expansion

Parallel to the surface

Normal to the surface

10-6/F

 

10-6/F

6

 

17

GREASE LUBRICATED      
Maximum sliding speed, U   fpm 500
Maximum pU factor

 

psi x fpm

80 000

Coefficient of friction     0.08 - 0.12
OIL LUBRICATED      
Maximum sliding speed, U   fpm 2 000
Maximum pU factor   psi x fpm 286 000
Coefficient of friction     0.03 - 0.08
RECOMMENDATIONS      
Shaft surface roughness, Ra

 

µm

≤ 2 - 16 *

Shaft surface hardness

Normal

For longer service life

HB

HB

> 200

> 350

* Depending on operating conditions

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