Sandwich cores sit between the skins of a fibre-and-resin part to form a composite construction. The selection includes foams, balsa wood, cork, nonwoven cores and honeycombs for marine, transport, wind-energy and industrial projects.
Documented applications for hulls, decks, bulkheads and panels are found in the PVC foam, PET foam and balsa wood families. There are also products for vehicle floors and components or wind blades. Selection must follow the overall design, not simply core thickness.
Cork cores and nonwoven cores offer different constructions for particular laminates and processes. Cut, grooved or mesh-backed sheets accommodate other geometries. Distinguish mould conformity, resin flow path and surface finish: they are not the same function.
Polypropylene and aramid honeycombs have different applications and manufacturing methods. PPSU foams and PMI foams broaden the selection for specialist projects, always according to the specific grade and its documentation.
The polyurethane sheet selection includes plain foam and a hybrid core with glass fibres. These are not equivalent constructions: check the documentation for each product before choosing it for a sandwich structure.
Sandwich construction depends on the fibres, resin, core and their bonding. Before choosing, define whether you will use hand lay-up, infusion, adhesive bonding or prepregs, and check which products are prepared for that process. Two cores of the same thickness are not necessarily interchangeable.
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