Plastic gasket sheet Meldin® Polyimides

for piston rodsfor valvesfor aerospace applications

Overview
Meldin® Polyimides are engineered polyimide (PI) materials formulated for continuous operation at elevated temperatures, controlled friction and superior dimensional stability. Supplied as stock shapes or precision-machined components, they are used where long life under high load, speed or aggressive environments is required.

Available formats and typical parts

• Stock shapes: sheets, rods, tubes
• Finished machined components: bearings, bushings, piston rings, vanes, guide rings, thrust washers, wear parts and custom geometries

Industries / Applications

• Aviation: seals, bearings, insulators
• Space: reusable and cryogenic components, leakage control
• Semiconductor: thermally stable, purity-critical components
• Industrial: pumps, valves, pistons, bearings and other wear components

Grades and material families

• Meldin® 2000 series — legacy range: high tensile and compressive strength with strong dimensional stability
• Meldin® 6000 series — PI-based: self-lubricating options, durable at elevated temperature and load, chemical and radiation resistant
• Meldin® 7000 series — thermosetting PI: extremely high dimensional stability at elevated temperature (examples: Meldin® 7001, 7021)
• Meldin® 8000/9000 series — porous, lubricant-filled PI structures for bearing cages and low-friction components

Features & benefits

• Continuous use at elevated temperatures (materials available for sustained service up to ~600°F / ~315°C depending on grade)
• Exceptional dimensional stability (example: <0.04% variation after thermal cycling 73°F → 500°F for selected grades)
• High wear resistance and controlled friction; selected grades provide self-lubrication
• Options for reinforced, low-friction and load-optimized formulations
• Total process control from powder to finished part including precision machining
• Extended component life under higher loads and speeds versus many alternatives

Technical performance examples

• Continuous service temperature: up to ~600°F (≈315°C), grade dependent
• Dimensional stability example: <0.04% change after thermal cycling 73°F (22.8°C) → 500°F (260°C) over 48 hours (reported for Meldin® 7000 series)
• 6000 series: long durability under high temperature/load; chemical and radiation resistance
• 8000/9000 series: porous, lubricant-filled microstructure for bearing cages and low coefficient of friction

Technical specifications

• Material family: polyimide (PI)-based engineered formulations
• Continuous operating temperature: up to ~600°F (grade dependent)
• Dimensional stability: example <0.04% change after 73°F → 500°F thermal cycling (grade-specific data)
• Formats: sheets, rods, tubes, near-net molded and machined components
• Common component types: bearings, bushings, piston rings, vanes, guide rings, thrust washers, wear parts
• Available series/grades: 2000, 6000, 7000, 8000/9000 (examples: Meldin® 7001, 7021)
• Key properties: high-temperature resistance, wear resistance, low-friction and self-lubricating variants, chemical and radiation resistance (selected grades)
• Manufacturing/control: formulation development, full process control from powder to part, in-house testing and precision machining
• PFAS note: PFAS-free* manufacturing options may be available depending on process and equipment; trace contamination cannot be fully excluded