Product Overview
PMI foam is a closed-cell, fully cross-linked polymer foam produced in a range of densities. Its fine, uniform cell structure delivers high compressive strength and creep resistance at low density, and it withstands processing temperatures and pressures beyond standard PVC and SAN foams, making it compatible with autoclave-cured prepreg and elevated-temperature infusion. The foam machines, thermoforms, and bonds cleanly. Grades are selected by density and temperature rating to match each part’s process window.
PMI foam core is a polymethacrylimide structural foam offering the highest stiffness and compressive strength per unit weight among polymer foams, combined with heat resistance that survives autoclave and out-of-autoclave cure cycles. It is specified in aerospace and high-performance applications where other foams collapse or creep. Cinon Composites supplies PMI grades as sheets, blocks, and machined shapes.
Specifications
| Parameter | Typical Value |
|---|---|
| Polymer | Polymethacrylimide (PMI) |
| Density | [ ] kg/m³ |
| Compressive strength | [ ] MPa |
| Compressive modulus | [ ] MPa |
| Shear strength | [ ] MPa |
| Max processing temperature | [ ] °C |
| Max service temperature | [ ] °C |
| Sheet size / thickness | [ ] mm × [ ] mm / [ ] mm |
Values vary by grade — contact sales for the datasheet.
Applications
Core wind blade spar caps and shells
High-stiffness cores in the most loaded blade zones.
Build aerospace sandwich panels
Autoclave-compatible cores for flight-worthy structures.
Produce radomes and antenna housings
Dimensionally stable, low-loss cores.
Race and high-performance automotive parts
Stiff, light cores for stressed body panels.
Key Advantages
Versus PVC and SAN foams, PMI can deliver roughly double the compressive strength at equal density and holds that strength at autoclave curing temperatures, so parts cure at higher pressure without core crushing. Versus honeycomb, it offers a solid, machinable core with better impact and surface finish and easier edge close-outs. The wider process window and higher stiffness translate into lighter, stiffer sandwich panels for demanding programs.
FAQ
Can PMI foam be cured in an autoclave?
Yes — PMI is designed for high-temperature, high-pressure processing; select density and temperature rating to match your cure cycle.
Does it bond to carbon prepreg skins?
Yes, with standard film adhesives or co-curing; surface preparation guidance is available from the Cinon Composites technical team.
Is it available in thermoformed shapes?
The foam thermoforms, and machined or shaped cores can be supplied for volume programs.
— Cinon Composites Technical Team
