How a sandwich panel works
“Aramid core” commonly refers to an aramid-based honeycomb used between two face sheets. It is one component of a sandwich construction. The outer skins resist tension and compression in bending; the core helps keep them apart and transfers shear between them.
Increasing the distance between the skins can improve bending stiffness efficiently. That does not mean thickness can be increased without limit: core shear, face instability, bond strength and local loads still constrain the design.
The choice of carbon, glass or other face-sheet reinforcement changes the panel’s stiffness, mass, impact behavior and manufacturing route. Evaluate these choices together rather than selecting a core independently.
The bond line is part of the structure
Adhesive connects the small cell-wall edges to the skins. Its compatibility with the core coating, skin material and cure process needs to be established. Adhesive quantity also contributes to panel weight, so a core-only mass comparison can be misleading.
- Confirm surface preparation and handling instructions for all constituent materials.
- Check the adhesive cure temperature, pressure and time against the core and laminate process window.
- Control contamination and moisture before bonding.
- Validate the bond using a representative panel and suitable inspection or test methods.
Processes developed for a closed-cell foam do not automatically transfer to an open honeycomb. In particular, uncontrolled resin entry into cells can change mass and fabrication behavior.
Design the edges and attachments early
Edge closeouts
Open edges need a detail appropriate to handling, moisture exposure and load transfer. Define the closeout material and process on the drawing so that it is included in the finished-panel weight and cost.
Inserts and hard points
Fasteners concentrate loads. An insert, locally reinforced region or other engineered attachment detail may be needed to spread those loads into the sandwich structure. Core selection alone does not establish pull-out capacity.
Cut-outs and joints
Openings interrupt load paths. Specify joint geometry, local reinforcement and inspection access alongside the core dimensions. Prototype the details that are most sensitive to manufacturing variation.
Plan for the finished component
State whether the inquiry is for a bare sheet, a shaped core or a complete bonded panel. These are different deliverables with different acceptance criteria. A drawing should distinguish core thickness from overall panel thickness.
For curved components, define the contour and orientation before choosing a formable honeycomb. The material guide explains the difference between hexagonal, overexpanded and specialized geometries.
Review requirements at panel level: stiffness, strength, surface finish, mass, environmental exposure and attachments. A representative test article can reveal processing and detail-design issues that a core data sheet cannot resolve.