MR-5 ALC Self-Lubricated Bearings
MR-5 ALC bearings made with an innovative composite material. This material consists of a special tape made from compounded PTFE wrapped around alluminium cladded steel supporting shell. The PTFE tape made from carbon and graphite, which give the bearings these properties: self-lubrication, noise isolation, and minimal play.
The MR-5 ALC bearings come in two key versions:
- Version E: with a high surface conductivity PTFE sliding layer
- Version D: with a non-conductive PTFE sliding layer
MR-5 ALC bearings are characterized by the use of aluminium cladded steel as the supporting shell.
MR-5 ALC bearings come in various forms, including: Cylindrical bearings; Flanged bearings; Washers; Belts; Cast-to-size parts.
These bearings are available in standard thicknesses of 0.500 mm, 0.750 mm, and 1.000 mm.
Operating Conditions
-
DRY -
OIL -
GREASE -
WATER -
PROCESS
FLUID
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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 | Aluminium cladded steel | 0,250 ÷ 0,750 mm (Depending on final thickness required) |
| Protective layer | Sn or Zn (as per customer requirement) | > 1 μm |
Characteristics
- Thick sliding layer with uniformly distributed solid lubricants
- Good calibration/sizing assembly (zero-clearance)
- High surface conductivity with E version PTFE, not-conductive D version PTFE available with notches/dimples, to prevent paint bridge issues, 1Ω volume conductance can be achieved with proper surface contact
- With right fit, uniform torque can be achieved at the required value
- Thick PTFE layer helps in edge loading
Technical Data
| Maximum Specific Load Static | 60-200 N/mm2 (8700-29000 psi) |
|---|---|
| Maximum Specific Load Dynamic | 45-120 N/mm2 (6540-17400 psi) |
| Service Temperature Minimum | -200°C (-328°F) |
| Service Temperature Maximum | +180°C (+356°F) |
| Service Temperature Intermittent | +260°C (+500°F) |
| Maximum Speed Dry | 1.5 m/s (300 fpm) |
| Coefficient of Friction Dry | 0.06 - 0.3 |
| Maximum Dry Load Factor Continuous | 1.8 N/mm2 · m/s |
| Surface Resistivity E version PTFE | ~105Ω |
| Surface Resistivity D version PTFE | ~1014Ω |