Pads or sheets
Pads or sheets of flexible materials such as elastomers, rubber, cork, dense foam and laminate materials.

Packaging material foam. Image reproduced from here
- Natural Frequency range: 3 – 40 Hz
- Pros:
- Have high damping (~21%).
- Low cost
- Easily available and designable
- Cons:
- Not feasible for low natural frequency situation.
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