Vespel® SP-21 is enhanced with graphite (15% per weight). This addition results in increased resistance and reduced friction. It has the incredible advantage that it can be used with our without lubrication in various applications. This makes Vespel® SP-21 a popular choice for automotive producers to use in for example thrust washers, bearings or seals. Of all graphite filled grades, Vespel® SP-21 shows the best mechanical properties.