Coatings and interior systems · Acoustic & Specialty
Polyester Acoustic Felt Panels and Baffles
Explains how moulded polyester felt differs from the fabric-wrapped acoustic wall panels covered elsewhere, since the felt is absorbent body and visible finish in one piece, with no frame and no facing.
Educational reference entry. Suitability depends on the complete assembly, substrate, exposure, installation method, manufacturer documentation, local requirements and qualified professional review.
Overview
What pet felt panel is
Polyester acoustic felt is made from polyester fibre, commonly including recycled bottle stock, laid into a web and thermally bonded so the fibres fuse to one another rather than being held by a chemical binder. The web is then compressed under heat into a self-supporting board with a dense felted face and a more open interior. It is produced as flat sheet and as moulded and folded forms, and it is coloured in the fibre rather than dyed at the surface.
The material differs from the fabric-wrapped acoustic wall panels described elsewhere in the library in a way that matters for how it is used. Those are assemblies: an absorbent core, a frame or backing, and a separate textile facing stretched over it. Felt is one homogeneous material that is both the absorbent body and the visible finish. There is no facing to come loose, no frame to build and no edge trim to conceal a core, which is why it can be cut to any outline and still look finished on every edge.
That single-material nature is why it appears in forms no wrapped panel can take. It is routed or knife-cut into shapes, tiles and fins; folded and welded into baffles and lighting shades; slotted so it can be bent into curves; and used as the backing to which timber slats are bonded in slat panel systems. Wherever it is used, the room still governs the outcome, and what any layout would achieve is a question for a qualified acoustic professional working from the whole space.
Terminology
Common names and aliases
These names describe the same thing. The library keeps one entry per material so that an acronym, a trade name or a regional spelling never becomes a second, thinner page.
- pet felt panel
- polyester acoustic felt
- recycled pet acoustic board
Applications
Common applications
Where this material is typically encountered. A typical application is not a statement that it suits your project.
- Wall panels and tiles cut into geometric or organic outlines and used as a visible finish.
- Hanging baffles and fins suspended below a ceiling in open-plan rooms and studios.
- Desk-mounted and floor-standing screens that divide an open workspace into zones.
- Backing boards to which timber slats are bonded in slatted panel systems.
- Ceiling rafts, clouds and lighting shades formed from folded and welded felt.
- Linings inside meeting booths, pods and small enclosed workspaces.
Consideration
Where it is commonly considered
- Where a soft, colourful surface is wanted as a finish in its own right rather than as a hidden layer.
- Where panels must be cut to a bespoke outline without needing edging, framing or trim.
- Where fixings must stay simple, since the material is light and can be adhered or hung.
- Where a room's layout may change and elements need to be moved, re-cut or reused.
- Where a qualified acoustic professional has advised on the room and the finish is being chosen within that advice.
Professional review
Where additional professional review is especially important
These are the situations where the answer depends on the specific building, and where a qualified professional should be involved before anything is decided.
- Where a measurable outcome is expected from a product, since that depends on the room and the whole construction.
- Where sound passing between rooms is the actual problem, which is a matter of construction rather than of a surface finish.
- In areas where the felt face would be scuffed, marked or handled routinely, since it is a textile surface.
- In damp rooms, or where panels would be washed down, which needs the maker's own written guidance.
- Where requirements applying to interior linings must be established, which is a matter for a qualified professional.
Properties
Key properties to discuss
Qualitative topics worth raising. Measured values, classes and grades come from the manufacturer's technical documentation for the specific product, not from a reference page.
- Acoustic behaviour
- Felt is a porous absorber: it acts on the liveliness of the room it faces, and contributes nothing to stopping sound passing between spaces, which is a matter of construction rather than of a finish. The two jobs are routinely confused. What a given quantity and arrangement would do in a given room is a question for a qualified acoustic professional using the maker's own test data.
- Appearance
- Colour runs through the fibre rather than sitting on the surface, and the felted face has a directional nap that catches light, so panel orientation and batch consistency both show across a finished wall.
- Installation dependency
- Panels are light and are commonly adhered, hung on standoffs or clipped, and the fixing method depends more on the substrate, and on whether panels must come down again, than on the felt itself.
- Surface wear
- The face is a textile: it takes fluff, dust and pilling, and it can be snagged by hard edges or hook-and-loop fastenings. Where panels sit within reach is worth deciding early rather than late.
- Maintenance
- Cleaning is by vacuum or brush rather than by wiping, and a mark in a coloured felt cannot be painted out, so the maker's own care guidance for the specific product genuinely matters.
- Repairability
- A damaged panel is replaced rather than repaired, and colour and batch matching is the practical difficulty, so an offcut or a spare tile is worth keeping from the original delivery.
- Substrate dependency
- Where panels are adhered, the wall finish behind decides whether the bond holds, and it also decides what happens to the paint or plaster when a panel is later taken down.
Exposure
Exposure and environmental conditions
- Is the room humid, and does the maker say anything about the felt in those conditions?
- Will panels sit within reach of hands, chairs, trolleys or cleaning equipment?
- Does the space generate dust, cooking grease or fibres that would settle into the felt?
- Will strong daylight fall on panels for long periods, and what does the maker say about colour?
- Are panels being hung where air movement from ventilation would set them swinging?
Assembly
Substrate and system dependencies
What this material sits on, is fixed to or depends on. This is usually where performance is won or lost.
- Adhered panels depend on the paint or plaster behind them, and removing them later usually takes some of that finish away.
- Hung baffles need a fixing point in the construction above, coordinated with lighting, ducts and detectors.
- Slat panels are a composite: the timber slats, the adhesive and the felt backing behave as one element and are handled as one.
- Where an air gap is left behind a panel, that gap is part of the assembly and should be set by whoever is advising on the room.
- Panels fixed to a demountable or lightweight partition depend entirely on that partition's own fixing capacity.
Appearance
Appearance and finish considerations
- Felt has a nap, so panels laid in different orientations read as different shades under the same light.
- Cut edges show the fibre and the interior density, which is part of the intended look rather than a defect.
- Colour batches vary, and a wall should be laid up from a single delivery wherever that is possible.
- Moulded and folded forms cast shadows that change the surface far more than colour alone does.
- The material reads as soft and textile, which sits quite differently in a room from timber, plaster or metal.
Durability
Durability questions
Questions to raise rather than a service life to expect. No material has a universal lifespan — it depends on the assembly, the exposure and the upkeep.
- How does the face hold up in a position where people brush past it or lean against it?
- What does the maker say about pilling, fluffing and colour change over the years?
- Are edges likely to be caught, and would a fixed edge trim change the look unacceptably?
- How do hung baffles behave over time where they are within reach or in moving air?
- Can a panel be taken down and refitted, or is removal effectively destructive?
Upkeep
Maintenance and repair considerations
- What cleaning method does the maker allow, and is any wet cleaning permitted at all?
- How would a stain in a coloured felt be dealt with, given that it cannot be painted over?
- Are spare panels or offcuts from the same batch being retained for later repairs?
- Who takes the panels down when the wall behind them needs to be decorated again?
- How is dust removed from moulded or fluted faces where a vacuum head does not reach?
Installation
Installation dependencies
What the installation depends on — not how to do it. Method belongs to the manufacturer's instructions and the trades carrying out the work.
- Setting out is done from a drawing where panels form a pattern, since felt cannot be nudged once adhesive grabs.
- Cutting on site is possible with a sharp blade but leaves a different edge from a factory router cut.
- Hanging systems need their fixing points established before ceilings and services are closed up.
- Panels must be conditioned and stored flat, since felt takes a set from being stacked badly.
- Where slats are bonded to felt, the panel is handled as a rigid unit and cut with saw equipment rather than a knife.
Documentation
Documentation to request
Ask for these in writing, for the specific product being proposed, and keep them with the project record.
- The maker's product data for the exact felt grade, thickness designation and colour being supplied.
- Care and cleaning guidance issued by the manufacturer rather than general textile advice.
- The recommended fixing method for the substrate in question, including any adhesive named.
- Batch and colour references, recorded so that a later replacement can be matched.
- Any test data the maker holds, to be passed to whoever is advising on the room.
Conversations
Questions for qualified professionals
Bring these to the relevant qualified professional, manufacturer or authority. Requirements vary by project and location.
- What is the actual complaint about this room, and is it reverberation within it or sound arriving from elsewhere?
- How much panel area is being suggested for this room, and on what basis was that arrived at?
- Where should panels go in this room, and does position matter more than quantity here?
- Is a felt finish appropriate given how this particular space is used and cleaned?
- What fixing method suits this wall, and what happens to the wall when panels come down?
- Should an air gap be left behind the panels, and who is making that decision?
- Are there requirements applying to interior linings here that need establishing first?
- What test data does the manufacturer hold, and who is qualified to interpret it?
Blind spots
Commonly overlooked points
- Felt is a finish as much as a technical material, and most disappointment comes from expecting a measurable result from a look.
- Adhered panels take paint off the wall when removed, which matters in rented or short-life fit-outs.
- Nap direction changes apparent colour, and a wall laid up carelessly ends up looking patchy.
- The material collects dust in ways a painted wall does not, particularly on moulded and fluted faces.
- Slat panels are usually timber bonded to a felt backing, which is worth knowing when comparing one slat product with another.
What this page does not do
- No acoustic performance is stated here in any form. Absorption within a room and isolation between spaces are different problems, and expectations must be set by a qualified acoustic professional from the whole room and its construction.
- Nothing is claimed here about recycled content, emissions or environmental credentials, and any such statement belongs to the manufacturer's own documentation for the product supplied.
- Requirements applying to interior linings are not addressed here and belong to the manufacturer's documentation and to a qualified professional.
- Build Design Hub tests, certifies, specifies and recommends nothing.
Related entries
Related materials
Materials from the same family, an adjacent role in the assembly, or a shared application.
Inspiration
Related Ideas Library pages
Design directions where this material commonly appears.
Preparation
Related planning checklists
Owner-side preparation before the conversation where this material comes up.
Go deeper
Related Build Design Hub guides
Planning guidance and neutral comparisons behind the decisions on this page.
Acoustic & Specialty Interior Surfaces
Reference entries for ceiling systems, acoustic linings and specialty interior surfaces — suspended grids and tiles, perforated and seamless acoustic finishes, baffles, and glass and metal facings.
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