Dry Friction Product Specifications* CLUTCHTEX® P-7

KEVLAR® fiber composite material is a non-molded and non-asbestos, textile-reinforced polymer for industrial clutch and brake applications. Offers uniquely high wear resistance and low opposing surface wear. Available bonded to carrier plates in thicknesses as required (often laminated over a cork-nitrile substrate), or as a flexible laminate up to 10 mm (3/8") thick.

 

 

Physical and Mechanical Properties

• Composition: 100% long KEVLAR® fibers and proprietary polymer binders. Includes no metal, no abrasives, no cotton, and no fillers.

• Density: 0.91 g/cu. cm (0.033 lb./cu.in.)

• Thermal conductivity: Extremely low

• Shock resistance: Excellent (does not crack, or break)

• Lubricant contaminant resistance: Does not degrade

• Abrasiveness: Non-abrasive to opposing iron, steel, and copper surfaces

Operating Conditions

• Static pressure: Up to 6900 kPa (1,000 p.s.i.), (or as limited by substrate)

• Dynamic pressure: 140 - 3100 kPa (20-450 p.s.i.)

• Temperature: Ambient to 315° C (600° F)

• Surface speed: Static to 40 m/s (8,000 ft./min.)

• Opposing surface: Machined and unfractured surface required, no fine finishing necessary

Surface speed, temperature, and pressure are interdependent energy parameters. Values represent typical conditions and are not the ultimate limits of the material. Burnish time to achieve full mating surface contact can be three to five times that of conventional materials.

Approximate Dry Friction Properties (after extended burnish)

• Wear rate: 1/5 to 1/10 that of asbestos materials, 1/2 to 1/3 that of sintered bronze materials

• Dynamic coefficient of friction: 0.36 µ ± 0.1 in the 95 - 345° C range (200° F - 650° F). Approximately 25% higher than molded asbestos, glass -fibered, and graphitic materials

• Static to dynamic ratio: 1.05

• Fade: Significant fade to 260° C (500° F), accelerating at 370° C (700° F)