Vespel® alternative & equivalent polyimide materials

High-performance polyimide materials

Dominion Advanced Materials supplies high-performance polyimide materials engineered for demanding applications where temperature resistance, friction, wear, dimensional stability, strength, and reliability are critical. Our material portfolio includes unfilled, graphite-filled, and specialty-filled polyimide grades designed to provide performance characteristics comparable to commonly specified DuPont™ Vespel® grades. Whether you are replacing an existing Vespel® component, developing a new design, or looking for a cost-effective alternative material, Dominion can provide an engineered polyimide solution matched to your application requirements.

Available Dominion equivalent grades

Dominion offers equivalent or alternative material grades corresponding to the following commonly specified Vespel® materials. DuPont identifies these grades for different combinations of properties and applications — for example, SP-1 is an unfilled polyimide, SP-21 is graphite-filled, SP-211 is a filled low-friction grade, and the SCP family provides newer high-temperature polyimide formulations with specialized performance characteristics.

Engineered alternatives — not one-size-fits-all

Polyimide materials are not interchangeable simply because they share the same base polymer. Different formulations are designed to emphasize different characteristics, and Dominion evaluates these requirements when selecting an appropriate material for a component. Our goal is not simply to substitute a material — our goal is to provide the right material for the application.

• Low friction and low wear
• High-temperature performance
• Compressive strength
• Dimensional stability and low thermal expansion
• Electrical insulation or electrical conductivity
• Chemical resistance
• Vacuum performance
• High-temperature wear resistance
• Creep resistance

Common applications

Dominion polyimide equivalent grades can be used for demanding components such as:

• Bushings — high-performance radial and sleeve bushings for rotating, oscillating, and reciprocating applications
• Thrust washers — low-friction thrust components designed to accommodate axial movement and wear
• Wear washers — precision wear components for demanding mechanical interfaces
• Bearings — polyimide bearing components where conventional metallic materials may not be ideal
• Seals and seal components — specialty polyimide materials for demanding sealing environments
• Wear pads — lightweight wear components for aerospace and industrial equipment
• Insulators — polyimide components requiring high-temperature electrical insulation
• Custom components — precision-machined components manufactured to customer drawings and specifications

SP-1 alternative

Our SP-1 equivalent material is intended for applications requiring the characteristics associated with unfilled polyimide, including high-temperature mechanical performance and electrical/thermal insulation. DuPont identifies Vespel® SP-1 as an unfilled polymer with strong physical properties and electrical/thermal insulation characteristics at elevated temperatures.

• Bushings
• Washers
• Insulators
• Seals
• Valve components
• Electrical components

SP-21 alternative

Our SP-21 equivalent is designed for applications where low friction and wear resistance are important. DuPont describes SP-21 as a graphite-filled polymer intended for low wear and friction applications.

• Bushings
• Thrust washers
• Bearings
• Dynamic seals
• Wear components

SP-22 alternative

Our SP-22 equivalent is intended for applications emphasizing wear resistance and dimensional stability, particularly where low thermal expansion is important.

• Bushings
• Washers
• Bearings
• Wear rings
• Precision wear components

SP-3 alternative

Our SP-3 equivalent is intended for demanding dry, vacuum, and low-lubrication environments where friction and wear performance are critical. DuPont identifies SP-3 for friction and wear applications in vacuum or inert-gas environments — its filler is molybdenum disulfide (MoS₂) rather than graphite.

• Vacuum components
• Bearings
• Bushings
• Seals
• Piston rings
• Wear components

SP-211 alternative

Our SP-211 equivalent is designed for applications requiring low friction and low wear, particularly where lubrication is limited or unavailable. DuPont describes SP-211 as a filled polymer with a low coefficient of friction across a broad operating range and low wear rates up to approximately 300°C / 572°F.

SP-202 alternative

Our SP-202 equivalent is intended for applications requiring electrical conductivity combined with low wear. DuPont identifies SP-202 for electrical conductivity, electrostatic charge removal, and low wear applications.

• Electrical handling equipment
• Precision mechanical components
• Wear components
• Bushings and washers
• Specialized electronic equipment

SCP-5000 alternative

Our SCP-5000 equivalent is designed for applications requiring a combination of high-temperature capability, compressive strength, chemical resistance, dimensional stability, and wear performance. SCP-series materials were developed for more demanding environments where increased thermal stability, chemical resistance, mechanical properties, and wear performance are required.

SCP-5050 alternative

Our SCP-5050 equivalent is intended for demanding high-temperature wear applications where thermal stability, wear resistance, and low thermal expansion are critical. DuPont describes SCP-5050 as having a coefficient of thermal expansion similar to steel and identifies it for high-temperature and wear applications, including aerospace applications.

• Aircraft engine components
• Bushings
• Washers
• Wear rings
• Seals
• High-temperature wear components

SCP-5009 alternative

Our SCP-5009 equivalent is designed for applications requiring high-temperature performance, compressive strength, wear resistance, and dimensional stability. The grade can be considered for demanding aerospace, industrial, and mechanical applications where conventional polyimide materials may not provide sufficient performance. DuPont’s materials documentation identifies SCP-5009 for demanding high-temperature applications and high compressive performance.

SCP-50094 alternative

Our SCP-50094 equivalent is intended for demanding applications requiring high-temperature wear resistance, toughness, and chemical resistance. DuPont specifically describes SCP-50094 as a proprietary polyimide designed for demanding applications requiring toughness and chemical resistance, and identifies aerospace and jet-engine applications including bushings, bearings, thrust washers, and wear components.

• Jet-engine components
• Bushings
• Bearings
• Thrust washers
• Wear pads
• Seals
• Valve components

SMP-40025 alternative — high-modulus direct-formed polyimide

Dominion also offers an alternative material for applications corresponding to the Vespel® SMP-40025 material family. This material category is intended for applications requiring high modulus, thermal stability, and thermal oxidative resistance. DuPont’s SMP-40025 documentation identifies the material as a direct-formed polyimide with high modulus, low elongation, thermal stability, and thermal oxidation resistance.

Why choose Dominion

When a component is specified as Vespel®, the material itself can represent a significant portion of the overall component cost. Dominion provides high-performance alternative materials and finished components designed to help customers achieve the required performance while potentially reducing material and component costs.

• Engineered alternatives — we evaluate the requirements of the application and identify an appropriate material grade, not a one-for-one polymer swap
• Custom machined components — bushings, washers, bearings, wear rings, seals, spacers, insulators, and custom components
• Aerospace focus — materials and components intended for demanding environments including aerospace, aircraft engines, power generation, and industrial turbomachinery
• Material flexibility — graphite-filled and unfilled polyimide solutions, specialty formulations, and aerospace-grade metallic materials

Need a Vespel® alternative? Send your part number or drawing

If you currently use a Vespel® component, you don’t have to start the engineering process from scratch. Send Dominion your existing part number, material specification, engineering drawing, CAD model, part sample, or operating conditions — or simply tell us what the component does. Our team can review the application and recommend an appropriate Dominion material and component solution.