iglidur® W300 - Material data

Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. With increasing temperatures, the compressive strength of iglidur® M300 plain bearings decreases. Fig. 02 clarifies this connection.

 

 

 
iglidur® W300 shows a very high compressive strength despite high elasticity. Figure 03 shows the elastic deformation of iglidur® W300 with radial loads. Under the maximum recommended surface pressure of 60 MPa, the deformation at room temperature amounts to less than 3 %.

Even at higher surface speeds, the coefficients of friction of iglidur® W300 bearings do not increase. Therefore compared to other materials it can attain slightly higher surface speeds, for instance up to 1.5 m/s rotating and up to 5 m/s linear. Due to the extraordinary wear resistance, the bearing wear remains low also in long-term application with high speeds. Extremely high speeds can be attained with iglidur® W300 bearings on hardened, not too smooth shafts.

iglidur® W300 bearings retain their extraordinary abrasion resistance even up to the maximum permitted application temperatures and do not tend to become brittle at low temperatures. An additional securing is recommended at temperatures higher than +60°C.

Just like the wear resistance, the coefficient of friction µ, friction coefficient in short, also alters with the load. In contrast to other iglidur® materials, the coefficient of friction of the iglidur® W300 remains constantly low even at higher peripheral speeds.

Friction and wear also depend to a high degree on the reverse partner. Very smooth shafts increase the coefficient of both friction and wear. Smooth shafts entail the danger of stick-slip. The squeaking noise as an effect of stick-slip is often the result of extremely smooth shafts. Shaft surface finishes of 0.4 to 0.5 µm are the best. For the iglidur® W300, the wear resistance is still excellent with this surface finish as the friction adopt the minimum value. Figure 06 shows a summary of the results of tests with different shaft materials. At high loads, hardened shafts should be chosen. Please contact us in case the shaft material scheduled by you is not included here.
 

iglidur® W300 bearings have a good resistance against chemicals. They are resistant to most lubricants. The iglidur® W300 is not affected by most weak organic and inorganic acids.

iglidur® W300 bearings are radiation resistant up to a radioactive intensity of 3 · 10² Gy.

igubal® W300 plain bearings are permanently resistant against UV rays. A slight colour change influences the properties only insignificantly.

In vacuum, iglidur® W300 plain bearing degases. The use in vacuum is possible only limitedly.

Bearings made of iglidur® W300 are electrically insulating.

The humidity absorption of iglidur® W300 bearings amounts to about 1.3 Wt.-% in standard climatic conditions. The saturation limit in water is 6,5 %. This should be considered according to environmental influences.

iglidur® W300 bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for press-fit in a housing with h7 tolerance. After the installation in a housing with nominal diameter, the inner diameter of the bearing automatically adjusts to the E10 tolerance. In certain dimensions the tolerance in dependence on the wall thickness deviates from this (See delivery program )