Abstract: A sound insulation material was prepared using glass fabric/ PVC composite filled with steel-smelting
scoria powder . The relationship between the sound insulation performance and the surface density was analyzed by
the two-channel acoustic analyzer . Then the change of the sound reduction index was compared when the composite
was filled with the steel-smelting scoria or not . The dynamic mechanical property , the st ructural morphology and
the static mechanical property of composites were measured by DMA , SEM , universal material testing machine ,
etc. The result s showed : in low-middle frequencies (500～1000 Hz) , the sound insulation performance of the
composites was increased with increasing surface density , but variation of the sound insulation performance was not
obvious in high frequencies ( > 1000 Hz) . The sound insulation performance of the composites was enhanced in low
-middle frequencies (500～1000 Hz) , when filled with steel-smelting scoria powder . The steel-smelting scoria filler
had a certain influence on the damping behavior and mechanical property of the PVC sound insulation materials.