Development of a Sound Absorbing Gypsum-Based Porous Composite Material

A new type of sound absorbing material was made from super-strength gypsum and glass fiber and the sound absorp-tion coefficient of the material was tested by standing wave tube method.Experiment results manifested that content of fiber,blowing agent,water-gypsum ratio and thickness have great effects on the sound absorbing performance of the samples.When the content of glass fiber,blowing agent and water-gypsum ratio are separately 3%,0.4% and 0.7,the performace of the mate-rial reaches optimum.The noise reduction coefficient of the material is 0.6,and the sound absorption property at middle-low fre-quency is good.