Rod polyimide Meldin® 7001

sheettubeaeronautical

Overview
Meldin® 7000 is a thermosetting polyimide (PI) series engineered for exceptional dimensional stability under elevated temperatures. Laboratory cycling from 73°F (22.8°C) to 500°F (260°C) showed <0.04% dimensional variation over two days. The material also demonstrates strong resistance to thermal shock, supporting tight tolerances in demanding environments.

Key grades and formulation
The series comprises multiple grades with targeted properties. Meldin® 7022 offers a very low coefficient of thermal expansion with aluminum-like expansion behavior. Meldin® 7021 contains ≈15% graphite by weight, delivering self-lubrication for high-temperature bearings, seals and thrust washers. 7000-series compounds can be formulated with additional fillers to enhance mechanical and thermal performance.

Performance characteristics

• Extremely high dimensional stability at elevated temperatures (variation <0.04% for 73°F → 500°F cycling over two days).
• Excellent resistance to thermal shock.
• Low coefficient of thermal expansion for select grades (e.g., 7022 ≈ aluminum-like behavior).
• Self-lubricating grades (e.g., 7021 with graphite) suitable for bearings and low-wear components.
• P × V limits for self-lubricating grades: >300,000 psi·ft/min (10.5 W/mm2) dry; >1,000,000 psi·ft/min (35.0 W/mm2) in liquid or grease-lubricated conditions.

Applications
Meldin® 7000 is used where metal replacement and thermal stability are required: aerospace structural components, satellite connectors, high-temperature bearings, seals, thrust washers, precision structural parts and semiconductor industry components.

Standard specifications
Material: Polyimide (PI) based — engineered for extreme temperatures
Service temperature: -200°C to +315°C
Mechanical strength: 40 MPa
Manufacturing: Hot compression molding; Isostatic molding; Direct forming
Tolerance control: ±10 µm
Typical dimensions available: Rods: φ80 mm × L 1 m; Tubes: φ10.5 mm × L 50 mm; Sheets: 300 mm × 50 mm; Custom shapes: 180 mm × 50 mm

Additional notes
Direct forming of the 7000 series improves cost-effectiveness and productivity. Purity and tailored filler formulations enable replacement of aluminum, ceramics and other high-performance plastics in critical applications.

Technical characteristics

• Material type: Thermosetting polyimide (PI) based.
• Dimensional stability: <0.04% variation after 73°F (22.77°C) → 500°F (260°C) cycling over two days.
• Service temperature range: -200°C to +315°C.
• Mechanical strength: 40 MPa.
• Manufacturing processes: Hot compression molding; Isostatic molding; Direct forming.
• Tolerance control: ±10 µm.
• Typical dimensions: Rods (φ 80 mm × L 1 m); Tubes (φ 10.5 mm × L 50 mm); Sheets (300 mm × 50 mm); Custom shapes (180 mm × 50 mm).
• Notable grades: 7001; 7021 (≈15% graphite, self-lubricating); 7022 (very low CTE); 7500.
• Self-lubrication P × V performance: >300,000 psi·ft/min (10.5 W/mm2) dry; >1,000,000 psi·ft/min (35.0 W/mm2) lubricated.
• Durability: Long-term dimensional stability under extreme temperature and load; chemical resistance compatible with 100% part inspection.