Polymethacrylimide (PMI) foam is a rigid, closed-cell thermoplastic structural foam renowned for its exceptional combination of properties. Serving as an ideal core material for composite sandwich structures in aerospace, radomes, medical devices, and high-end industrial applications, it perfectly balances lightweight design with high strength, superior heat resistance, and excellent processability. PMI foam is a revolutionary product that addresses the limitations of traditional honeycomb and other foam core materials.
Why Choose PMI Foam as a Core Material?
PMI foam significantly simplifies the manufacturing process of composite sandwich structures, shortens production cycles, and fundamentally overcomes the drawbacks of traditional cores:
Compared to Honeycomb Cores: It solves issues like large cell size, moisture absorption, and risk of debonding.
Compared to Traditional Foams (e.g., PVC, PUR): It overcomes low strength, low modulus, and poor heat resistance, thereby greatly enhancing the longevity and reliability of the final composite part.
Core Performance Advantages of PMI Foam
1. Exceptional Specific Strength & Modulus
PMI foam boasts one of the highest specific strength (strength/density) and specific modulus (modulus/density) ratios among all plastic foams. Using PMI core enables the production of lighter, stronger, and stiffer components, preventing instability and improving energy efficiency in applications like aircraft.
2. Outstanding Heat Resistance
Thanks to its unique polymer chain structure (complete imide rings and cross-linking), PMI foam offers excellent performance under heat and pressure. It remains stable in medium-temperature (approx. 130°C) and high-temperature (approx. 180-190°C) co-curing processes such as autoclave and hot press molding, with minimal compression creep. Post-processed at high temperatures, it features low internal stress and exceptional dimensional stability, preventing core collapse or blistering during curing.
3. 100% Closed-Cell Structure
Process Friendliness: Very low and controlled resin absorption, isotropic properties, making it highly suitable for various processes like resin infusion and prepreg molding.
Superior Durability: Eliminates moisture uptake and debonding risks, ensuring long-term structural integrity.
Good Thermal Insulation: The closed-cell structure provides excellent thermal insulation properties.
4. Excellent Fatigue & Mechanical Performance
PMI foam exhibits outstanding fatigue resistance, making it suitable for dynamically loaded parts like helicopter rotor blades. Combined with fiber reinforcements, it enables composite parts with a service life far exceeding that of metal components.
5. Easy Machining: Can be readily cut, milled, and CNC-machined into complex shapes. It can also be thermoformed into curved parts, allowing great design freedom.
6. Strong Adhesion: Its polar molecular structure and porous surface enable excellent chemical bonding with various resins (epoxy, bismaleimide, cyanate ester) during co-curing. Laminating with adhesives allows for thick panel construction.
7. Low Dielectric Constant & Loss
Maintains extremely low dielectric properties over a wide frequency range, making it an ideal core material for radar-transparent structures like aircraft radomes.
8. Low Aluminum Equivalent (Low X-ray Absorption)
When used in medical device components like CT tabletops, it enables clear imaging with minimal radiation dose.
Our PMI Foam Product Series & Detailed Technical Parameters
We offer a full density range of PMI foams to meet diverse application needs, from lightweight radar transmission to ultra-high strength. All series share the core advantages of closed-cell structure, excellent flame resistance (OI 27), fast delivery, and high cost-performance ratio.
1. R-Series PMI Foam - Universal High Performance
Features: A balanced, high-performance series with a Heat Deflection Temperature (HDT) of 180°C.
Key Applications: Primary/secondary aerospace structures, radomes, general industrial applications.
| Grade | Density (kg/m³) | Compressive Strength (MPa) | Compressive Modulus (MPa) | Tensile Strength (MPa) | Tensile Modulus (MPa) | Flexural Strength (MPa) | HDT (°C) | Standard Size (mm) |
|---|---|---|---|---|---|---|---|---|
| R-52 | 52 | 0.9 | 45 | 1.5 | 54 | 1.6 | 180 | ≥2500×1250×80 |
| R-75 | 75 | 1.5 | 85 | 3.0 | 90 | 2.5 | 180 | ≥2500×1250×70 |
| R-110 | 110 | 3.0 | 150 | 4.0 | 170 | 4.6 | 180 | ≥2500×1250×60 |
2. F-Series PMI Foam - Enhanced Heat Resistance
Features: Higher heat resistance grade with an HDT of up to 190°C, suitable for more demanding curing processes.
Key Applications: High-temperature prepreg curing processes, parts requiring long-term thermal stability.
| Grade | Density (kg/m³) | Compressive Strength (MPa) | Compressive Modulus (MPa) | Tensile Strength (MPa) | Tensile Modulus (MPa) | Flexural Strength (MPa) | HDT (°C) | Standard Size (mm) |
|---|---|---|---|---|---|---|---|---|
| F-30 | 30 | 0.4 | 20 | 0.9 | 37 | 0.8 | 190 | ≥2500×1200×100 |
| F-35 | 35 | 0.45 | 30 | 1.2 | 45 | 1.1 | 190 | ≥2500×1200×90 |
| F-40 | 40 | 0.65 | 40 | 1.5 | 56 | 1.4 | 190 | ≥2500×1200×90 |
| F-52 | 52 | 0.9 | 52 | 1.9 | 70 | 2.0 | 190 | ≥2500×1200×90 |
| F-75 | 75 | 1.7 | 80 | 2.9 | 105 | 3.1 | 190 | ≥800×1200×80 |
| F-110 | 110 | 3.0 | 140 | 4.2 | 180 | 5.0 | 190 | ≥800×1200×75 |
3. X-Series PMI Foam - Full Density Range
Features: The broadest density range (30-350 kg/m³), from ultra-lightweight to ultra-high strength, offering maximum design flexibility.
Key Applications: Ranging from lightweight sandwich panels to high-performance, lightweight structures bearing extreme loads.
| Grade | Density (kg/m³) | Compressive Strength (MPa) | Compressive Modulus (MPa) | Tensile Strength (MPa) | Tensile Modulus (MPa) | Flexural Strength (MPa) | HDT (°C) | Standard Size (mm) |
|---|---|---|---|---|---|---|---|---|
| X-30 | 30 | 0.4 | 20 | 0.9 | 37 | 0.8 | 180 | ≥2500×1250×95 |
| X-52 | 52 | 0.9 | 50 | 1.5 | 72 | 1.9 | 180 | ≥2500×1250×90 |
| X-75 | 75 | 1.5 | 75 | 2.8 | 105 | 3.2 | 180 | ≥2500×1250×105 |
| X-110 | 110 | 3.0 | 130 | 4.0 | 180 | 4.8 | 180 | ≥2500×1250×90 |
| X-200 | 200 | 9.0 | 300 | 7.0 | 430 | 13.5 | 180 | ≥800×900×45 |
| X-250 | 250 | 13.0 | 550 | 11.0 | 650 | 17.0 | 180 | ≥800×800×40 |
| X-350 | 350 | 21.0 | 780 | 15.0 | 840 | 26.0 | 180 | ≥800×800×40 |
Professional PMI Foam Value-Added Processing Services
With over 20 years of experience, we offer comprehensive processing services using advanced CNC machinery:
High-Precision CNC Machining: Support for custom complex shapes and dimensions.
Hot Press Forming: For manufacturing structural parts with complex curvatures.
High-Quality Cutting & Surface Preparation.
Composites
Selectable Material Combinations:
| Core material | Reinforciring material |
| · PMI foam | · Carbon fiber |
| · PVC foam | · Glass fiber |
| · PET foam |
Packaging
Looking for a Reliable High-Performance PMI Foam Supplier?
We provide a complete solution, from standard boards (R, F, X series) to custom processing, committed to replacing world-renowned PMI foam brands at a more competitive cost. Let us help you achieve lightweighting and performance breakthroughs. Contact us today for detailed technical data sheets and samples.
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