DuPont™ Vespel®PI SP Vs.Vespel®SCP

DuPont™ vespel®SP precision parts are available in a number of standard and special purpose compositions. Some compositions contain fillers to enhance the performance of the Polyimide material in one or two key characteristics.

Graphite is added, for example, to reduce friction and wear and fluoropolymer to lower static friction or reduce abrasion against soft metals. A brief description of DuPont`s polyimide compositions follows.

Vespel®SP for Demanding Applications

SP-1 Mechanical and electrical parts at elevated temperatures.

Valve seats, seal, insulators.

Unfilled base resin. Maximum strength and elongation:

lowest modulus and thermal conductivity: optimum

electrical properties.

SP-21

For lubricated or non-lubricated, low friction and wear

applications.

Valve seats, seals, bearings, washers, seal rings.

Contains graphite. Enhances inherent wear resistance,

improves long term thermal stability.

SP-22

Applications in which low thermal expansion is more

important than strength (which is slightly reduced).

Bearings (bushings, washers, etc.).

Contains graphite. Gives low coefficient of thermal

expansion. Maximum creep resistance.

SP-211

For low friction and wear applications in moderate

temperature and PV environments.

Bearings (bushings, washers, etc.).

Contains graphite and fluoropolymer. Lowest static

friction.

SP-3 For friction and wear applications in vacuum or inert gases.

Bearings, piston rings and seals.

Contains MoS2. For friction and wear applications in

vacuum or inert gases.

SP-2515 Designed for wear against aluminum, low coefficient of

friction in dry environments.

Contains graphite. High thermal conductivity, low CTE

(matches aluminum).

SP-202 Electronics handling. Low wear rates for long part life and

cleaner environments.

Conductive. With advanced filler technology materials

needed for electronics handling.

DuPont developed Vespel® SCP as the next generation of polyimide, fulfilling the need for materials which can withstand even more demanding applications. Vespel®SCP builds on decades of experience using polyimides in the most challenging applications, while offering the following advantages over Vespel®SP:

• Increased thermal stability

• Better chemical resistance

• Improved wear and friction performance

• Improved mechanical properties

As with Vespel®SP, multiple grades of Vespel®SCP are available to service specific application needs:

Vespel®SCP: Next Generation Polyimide for Highest Thermal Oxidative Resistance and Strength

SCP-5000

Aerospace applications, electronics (wafer inspection disk).

Best performance at the highest temperatures for the longest times.

Unfilled SCP polyimide resin.

SCP-5009 Ball bearing retainers, bushings, washers

Advanced filler technology. Excellent combination of physical properties, such as high compressive strength and low tendency to creep, even under extreme conditions.

SCP-50094 Valve seats, test sockets, bearings and bushings.

Advanced filler technology. Highest PV limit of any grade. Excellent combination of physical properties,wear resistance and temperature resistance.

SCP-5050 CTE matches steel and cast iron. Advanced filler technology. Lowest CTE.

Unsurpassed wear resistance and thermal stability