Key words: polyurethane seals, polyurethane materials, wear resistance

Wear Resistance of Polyurethane Seals

The wear resistance of polyurethane seals is excellent. The test results are generally in the range of 0.03-0.20 mm3/m, which is about 3-5 times of natural rubber. In practical use, due to the influence of lubricants and other factors, its effect is often better.

The wear resistance of polyurethane seals is closely related to tear strength and surface condition of materials.

The tear strength of polyurethane seals is much higher than that of other rubber, but its friction coefficient is not low, generally more than 0.5. It is necessary to add lubricants such as oil or a small amount of molybdenum disulfide or graphite, silicone oil and tetrafluoroethylene powder to reduce friction coefficient and heat generation.

Comparing the wear of polyurethane seals and other materials on dry surfaces, it can be seen that polyurethane materials have lower wear than other materials, and will be more wear-resistant. In addition, the friction coefficient is also related to material hardness and surface temperature. In all cases, the friction coefficient increases with the decrease of hardness, although the surface temperature increases. The maximum temperature is about 60 C.