Abstract: Prefabricated self-supporting panels having two outer layers and at least one inner layer provided with a foamed mixture, wherein the inner layer comprises unsaturated polyester resins, a coupling agent of the organo-functional silane type and a granular filler formed with foamed clay which fills the whole cavity between the two outer layers and has an average diameter between 15 and 20 mm and a specific gravity of 0.35 Kg/dm.sup.3.The process for the manufacture of these panels has also been described.
Abstract: Prefabricated self-supporting panels having at least two outer layers and one inner layer provided with a foamed mixture, wherein the inner layer comprises unsaturated polyester resins, hollow microspheres of aluminum phyllosilicate having an average diameter of 150 microns and density of 0.7 kg/cu.dm., and a coupling agent of the organofunctional silane type.The process for the manufacture of these panels has also been described.