PMI Foam Core From China
Rigid Closed-Cell Core Material for High-Performance Sandwich Composites
PMI foam core (Polymethacrylimide Foam Core) is a rigid, closed-cell structural foam designed for sandwich-structured composite materials. It is halogen-free, features a uniform cell structure, and offers an excellent combination of lightweight performance, high mechanical strength, thermal resistance, and ease of processing.
PMI foam core is suitable for the vast majority of sandwich composite structures and is widely used in aerospace, marine, wind energy, automotive, rail transportation, medical equipment, sports equipment, and electronic applications.
Material Properties & Thermal Performance
PMI foam core can withstand demanding composite curing conditions. Depending on foam density and grade, typical curing capabilities include:
Up to 200 °C at 0.3 MPa
Up to 180 °C at 0.7 MPa
Lower-density grades correspond to lower allowable curing pressure. The closed-cell structure ensures stable performance and dimensional consistency during high-temperature and high-pressure curing.
Resin Compatibility & Composite Processes
PMI foam core shows excellent compatibility with a wide range of resin and adhesive systems, including:
Epoxy resins
Bismaleimide (BMI) resins
Polyurethane resins
Phenolic resins
Unsaturated polyester resins
Vinyl ester resins
It is suitable for common composite manufacturing processes such as:
Autoclave curing
Vacuum bagging
RTM (Resin Transfer Molding)
VARTM (Vacuum-Assisted Resin Transfer Molding)
VARI (Vacuum-Assisted Resin Infusion)
HP-RTM (High-Pressure Resin Transfer Molding)
The optimized surface resin absorption of PMI foam core allows engineers to balance peel strength and lightweight requirements effectively.
Processing & Machinability
To meet the processing requirements of components with different sizes and complex geometries, PMI foam core can be:
Hot-pressed
Bonded with various structural adhesives
Machined using standard CNC equipment
The material is easy to process and suitable for both prototyping and series production of composite sandwich cores.
PMI Foam Core Product Variants
Mold-Foamed PMI Foam Core
This PMI foam core is foamed and formed in a closed mold cavity using PMI foam granules. It enables cost-effective mass production of fiber-reinforced sandwich components with complex geometries.
Inserts can be integrally formed during foaming
Finished core components can be used directly for lay-up and curing
CNC machining can be combined if one-step molding is not feasible
Custom densities from 75 kg/m³ to 200 kg/m³ (or higher) are available upon request.
Environment-Optimized PMI Foam Core
Traditional PMI foam is difficult to degrade naturally and may cause long-term environmental impact. Modified PMI foam solutions improve biodegradability and recyclability, helping to:
Reduce plastic pollution
Lower raw material consumption
Reduce energy use and carbon emissions
These solutions support sustainable development and long-term carbon reduction goals while maintaining excellent performance.
CNC Machining Center
The CNC Machining Center was established in 2018 and is equipped for large-scale production. The facility operates both 3-axis and 5-axis CNC machines, enabling high-precision processing of PMI foam core components.
Machining accuracy up to ±0.01 mm
Customized PMI foam core machining based on customer drawings
Fast delivery under strict quality standards
The CNC center mainly serves industries including aerospace, rail transportation, new energy vehicles, medical equipment, marine, 3C electronics, and sports equipment. Stable process control and customized machining methods based on PMI foam characteristics help reduce customer workload and improve efficiency.
Composite Manufacturing (CM) Center
The Composite Manufacturing (CM) Center was established in 2019 and has accumulated extensive experience in composite processing.
Capabilities include:
Supply of various composite materials, including epoxy resins and adhesive films
Combination of carbon fiber, glass fiber, or metal films with PMI foam core
Enhanced mechanical performance through integrated sandwich structures
The facility is equipped with autoclaves and conventional vacuum-assisted thermal curing systems, supporting a wide range of composite manufacturing requirements.
Technical data of PMI foam core
Applications
AerospacePMI foam core meets the high-temperature and high-pressure curing requirements of aerospace composites and is widely used in UAVs, helicopters, and aerospace structural components, contributing to lightweight design and improved endurance.
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Rail & High-Speed TransportationPMI foam core sandwich structures used in roofs, floors, and sidewalls can reduce vehicle weight by 25–30% without compromising stiffness, significantly lowering energy consumption for metro and rail vehicles.
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Wind EnergyIn large wind turbine blades, PMI foam core provides a high strength-to-weight ratio and reduced resin absorption, supporting longer blades and improved energy efficiency.
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Medical EquipmentPMI foam core offers low aluminum equivalence, improving X-ray transmission efficiency. Carbon fiber / PMI foam sandwich structures are widely used in X-ray and CT scanner bed boards, enabling clearer imaging at lower radiation doses.
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ElectronicsPMI foam core provides excellent electrical insulation, thermal resistance, and impact protection for electronic components. PMI foam diaphragms also offer high stiffness and damping properties to reduce vibration and noise.
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Sports EquipmentPMI foam core enables lightweight yet high-strength sports equipment and is suitable for wheels, rackets, bats, snowboards, and surfboards, improving performance and durability.
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Marine & YachtingPMI foam core meets marine composite requirements for lightweight construction, corrosion resistance, thermal insulation, sound insulation, and long service life, and is widely used in decks and bulkheads.
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Automotive LightweightingPMI foam sandwich structures are increasingly used in doors, engine hoods, and roof panels, reducing vehicle weight while maintaining stiffness-particularly important for new energy vehicles.
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Summary
PMI foam core is a reliable and versatile core material for sandwich composite structures, offering:
Lightweight design with high strength
High-temperature curing capability
Broad resin and process compatibility
Easy machining and customization
Integrated CNC and composite manufacturing support
It provides a complete material and processing solution for advanced composite applications.
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