What are the differences in sound dampening between thick and thin plastic lids?

The effectiveness of sound dampening in plastic lids primarily depends on material thickness, density, and structural composition. Thick plastic lids (typically 3mm+) provide superior noise reduction due to their greater mass, which absorbs and blocks sound waves more effectively. The additional material creates a barrier that reduces vibration transmission and minimizes high-frequency noise. Thin plastic lids (under 2mm) offer minimal acoustic insulation as their lightweight construction allows more sound waves to pass through. Material density also plays a crucial role - high-density plastics like polycarbonate outperform low-density polyethylene regardless of thickness. Additionally, thick lids often feature better sealing mechanisms and multi-layer designs that enhance their noise-blocking capabilities. For optimal sound dampening, combination approaches using thick lids with added acoustic foams or rubber gaskets prove most effective.