Why 9mm Is Standard
Most PET acoustic panels use 9mm felt because it balances weight, cost, and NRC (around 0.8). It is rigid enough to mount flat and light enough for ceilings.
What 12mm Adds
At 12mm the panel gains stiffness and roughly 3-5% more low-frequency absorption. It also feels more substantial and hides minor wall imperfections better.
Cost Difference
- 9mm: baseline price, widest color stock
- 12mm: typically +10-18% per sqm
When to Choose 12mm
- Large open ceilings with no framing
- High-end interiors where rigidity shows
- Printed UV panels needing a stable substrate
When 9mm Is Enough
Wall grids, slat backing, and budget office rolls. Pair thicker felt with an air gap and you close most of the 12mm performance gap for less money.
Need both? Our factory stocks 9mm and 12mm in matching colors so you can mix without visible seams.