PANNEAU INSONORISANT POUR ELEMENTS DE CONSTRUCTION

摘要

A composition for sound absorbent panels, which may be utilized in construction elements, comprises a mixture of 70 to 97 weight percent of carbon-contained material and a binder of synthetic plastic material. The carbon-contained material used in the composition contains 50-60% of pure carbon and 40-50% of inorganic constituents and may be obtained from residues of coal hydrogenation or pitch filtration. The material is treated at an elevated temperature and under pressure before the binder is added thereto and then the obtained compound is formed into a panel.