ACOUSTIC AND MECHANICAL PROPERTIES OF FOAM GYPSUM DECORATIVE CEILING PANELS

Material structure depends on its production technology and by varying this technology it is possible to obtain similar structures. Physical and mechanical properties depend on the material structure and relating that to the material thickness, it is possible to change the maximal sound absorption coefficient position in the range of frequency. The paper examines the development of foam gypsum sound absorption material production technology, in order to obtain materials with the rules of sound absorption coefficient at the same time fulfilling the strength requirements. The sound absorption coefficient was determined with a empty set40mm impedance tube and in a reverberation chamber according LVS EN ISO 354:2003. Flexural strength for beams was determined in a three-point bending test and for ceiling panels according LVS EN 14246:2006. The study of the results was acquired from a foam gypsum production technology that simultaneously executes the strength requirements and provides a Class B sound absorption material. It has been found that foam gypsum sound absorption material and mineral wool is similar to the behavior of the sound absorption coefficient and the thickness of the product, although these materials are different structures.