DuPont™ Vespel® SP-21 is graphite-enhanced with low-friction properties for use with or without lubrication in various applications. Vespel® SP-21 has maximum physical strength, elongation, and toughness. Available as custom parts or stock shapes.

DuPont™ Vespel® SP-21 is available as isostatically molded billet and unidirectionally pressed slab specified as Type II, Class 1M and Type II, Class 1P respectively per ASTM 6456-10 / MIL-R-46198. Vespel® SP-21 is specified as Class 2 per AMS 3644G.

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.

Vespel® SP-21 is enhanced with 15% graphite by weight which is added to the base resin for increased resistance and reduced friction in applications such as bearings, thrust washers, bushings, seal rings, slide blocks, and other wear applications.

Vespel® SP-21 has the highest mechanical properties of the graphite filled grades. Automotive engineers love to use Vespel® SP-21 for parts like thrust washers, bearings, and seals because the low-friction properties means they work with or without lubrication.

Vespel SP-21 Color :  Dark Brown 

Grades :  Grapgite - Filled 

Standard Sizes :

Vespel Sp-1 Pi Sheet:   Dimensions   5 in x 5 in  -  10 in x 10 in

                                     Thickness 0.062 in - 2 in

Pi Polyimide Rod Sheet Rod :    Outside diameter : 0.125 in - 6 in 

DuPont™ Vespel® SP-21 PERFORMANCE CHARACTERISTICS:

• Low wear at high bearing PV's
• Low coefficient of friction
• Long-term thermal stability
• High stiffness
• Low elongation
• Outstanding performance with or without lubrication
• Good strength and impact resistance