Polyester fiber is a synthetic fiber material with high tensile strength and good heat resistance. When making sound-absorbing cotton, polyester fiber can be used as filler to absorb and disperse sound through its fine pore structure.
Non-woven fabric is a kind of non-woven fabric formed by interweaving and condensing fiber webs or fiber layers by chemical, thermal or mechanical methods. Non-woven fabrics have the characteristics of softness, breathability and sound absorption. They are often used as outer materials in the production of white sound-absorbing cotton, which can protect the inner filling materials.
Therefore, white sound-absorbing cotton can usually contain polyester fibers and non-woven fabrics. However, it should be noted that different brands and models of sound-absorbing cotton may use different material combinations.