MR-5

MR 5 material structure

The MR-5 trademark identifies a range of bearings composed material of compounded PTFE (polytetrafluoroethylene) tape on a metal shell (steel). The tape of PTFE contains carbon and graphite (without lead, complying with the European Parliament’s “ELV” directive 2000/53/Ec), that give at the material self lubricating, isolates noise and is designed for obtain self lubricated bearings without play.

The available products are cylindrical and flanged bearings, washers, belts and cast-to-size parts with thickness standard is from 0,500 / 0,750 and 1,000 mm.

Structure of the composite material:

Layer Average analyses of the material Thickness of layer
Sliding layer PTFE Modified 0,150 ÷ 0,170 mm
Supporting shell DC 04 (EN 10139)
  • Cu = 0,060 Max
  • Mn = 0,15 ÷ 0,32
  • P = 0,025 Max
  • S = 0,030 Max
  • Al = 0,028 ÷ 0,070
0,250 ÷ 0,750 mm
  • (Depending on final thickness required)
Protective layer Zn 2 ÷ 15 μm

Operating Conditions

Dry

Oil

Grease

Water

Process fluid

Very Good Good Good Fair Fair

Availability

Characteristics

  • High load capacity
  • Easy mounting
  • Sizing assembly (zero-clearance)
  • High thermal conductivity
  • Wide range of service temperatures
  • Extremely thin wall bearings
  • No maintenance
  • Special items available on demand
  • High formability
  • Special items available on demand

Technical Data

Maximum Specific Load Static 200 N/mm2 (29000 PSI)
Maximum Specific Load Dynamic 150 N/mm2 (21800 PSI)
Maximum Speed 1,5 m/s (300 fpm)
Service Temperature Minimum -200°C (-328°F)
Service Temperature Maximum +180°C (+356°F)
Service Temperature Intermittent +260°C (+500°F)
Coefficient of Friction 0,05 ÷ 0,15 μ
Maximum Dry Load Factor 1,8 N/mm2 * m/s
Volume Resistivity ASTM D257 103 Ωc/m
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