The object of the invention is a method of manufacturing a product in the form of a sandwich comprising a core and external layers. The outer layers are composed of a composite material comprising a polymer matrix reinforced with fibers. The process uses an insert made of heat-resistant material, for example silicone. The object of the present invention is to provide a method of manufacturing a sandwich which makes it possible to dissociate the choice of the material of the core of the sandwich and the choice of the material of the outer layers.
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