| Fabric-wrapped mineral wool or fiberglass | Often achieves a high NRC, commonly around 0.80–1.00 in tested configurations. Performance depends on thickness, density, facing, and mounting. | Reducing reflections and reverberation in studios, offices, classrooms, and meeting rooms. | Request an ASTM C423 or ISO 354 laboratory report. Check the tested thickness and whether the panel was mounted with an air gap. | Review the panel’s fire-test documentation, edge protection, fabric durability, and installation hardware. Avoid assuming that the core’s properties apply to the complete panel. |
| PET felt panels | Ranges widely with thickness and design; thin decorative sheets may absorb substantially less than thicker panels or assemblies with an air gap. | Lightweight wall treatments, shared work areas, and spaces where low weight or a firm surface is useful. | Compare laboratory absorption data at individual frequencies, not just a single summary rating. Confirm that the tested construction matches the panel being considered. | Check recycled-content claims, material composition, cleanability, flame-test results, and whether the edges remain stable during normal use. |
| Acoustic foam | Typically more effective at mid and high frequencies than at low frequencies; performance depends strongly on thickness, profile, and mounting. | Controlling high-frequency reflections in suitable, appropriately protected indoor applications. | Look for independent test results for the exact foam shape and thickness. A textured or wedge profile alone does not establish acoustic performance. | Check fire classification, smoke-related documentation where relevant, and suitability for the room. Do not cover required vents, sprinklers, or exits. |
| Perforated or slatted wood absorber | Absorption depends on the perforation or slot pattern, cavity depth, backing material, and any porous infill; there is no single rating for all designs. | Rooms needing sound control alongside a hard, architectural finish. | Ask for test data for the full assembly, including backing and cavity. Check frequency-by-frequency results for the room’s needs. | Inspect veneer or finish quality, panel alignment, mounting details, and fire documentation for the complete assembly. |
| Ceiling clouds and suspended baffles | Can provide substantial absorption because both faces may be exposed; results depend on panel area, spacing, and suspension height. | Open offices, classrooms, dining areas, and rooms with reflective ceilings. | Confirm the test configuration and exposed surface area. For suspended products, compare absorption per unit area using equivalent test information. | Check load limits, suspension hardware, seismic or local code requirements where applicable, and clearance from lights and building services. |
| Any panel: rating and test report | NRC is a rounded, single-number rating based on absorption at 250, 500, 1,000, and 2,000 Hz. It does not describe performance at every frequency. | Shortlisting products, followed by checking whether their measured performance suits the room. | Prefer a report from an independent laboratory using ASTM C423 or ISO 354. Compare octave-band data and the exact mounting conditions. | Check the report date, tested product identification, thickness, mounting, and any stated limitations. Treat marketing claims without supporting test details cautiously. |
| Any panel: room fit and installation | Panels reduce reflected sound and reverberation; they do not block sound transmission through walls or make a room soundproof. | Choosing coverage and placement after identifying the room’s main reflection and reverberation problems. | Consider room size, surface coverage, ceiling height, furnishings, and the target use. A qualified acoustic assessment can help where speech intelligibility or critical listening matters. | Use suitable fixings for the substrate and follow the manufacturer’s installation instructions. Keep panels clear of safety equipment and maintainable building systems. |