Table 11 Averaged sound absorption coefficient for different combinations of microplastic powder and flakes.

From: A sustainable acoustic customization of open porous materials using recycled plastics

Sample

PET powder [g]

PET flakes [g]

αw—side A

αw—side B

1

3.0

0.0

0.37

0.59

13

2.0

1.0

0.44

0.46

14

1.5

1.5

0.43

0.55

15

1.0

2.0

0.41

0.57

16

0.5

2.5

0.40

0.49

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