Edil Leca's range of sound-absorbing cladding blocks and slabs are made of water-repellent expanded clay concrete in the mass and coloured with iron oxide pigments. The various shapes and surfaces allow the designer and client to choose the best solution for every technical-constructive and aesthetic requirement.The richness of the surfaces and colours leave ample creative space for the designer to fit the work into the environmental context. The colouring created in the concrete mass using grey or white cement, inorganic oxides and Leca expanded clay remains unchanged over time. Sound-absorbing Lecablocs are made water-repellent in the mass, with low absorption values due to imbibition and capillarity, which prevents the penetration of rainwater and thus offers excellent durability.