Acoustic Foam Sheet 25A — 25kg/m³, Crib 5 & UL94-HF-1 Fire Rated (RX25/140)
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£45.99
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A fire rated acoustic foam sheet for absorbing sound in rooms that need it — 25 kg/m³ density, 140 Newton firmness, rated Crib 5 and UL94-HF-1, cut in the UK.
Acoustic foam works by absorbing sound wave energy rather than reflecting it. Mounted on walls and ceilings it acts as a soft barrier that stops sound ricocheting, which reduces flutter echo, reverberation and standing waves. It is widely used in recording studios, rehearsal rooms, home offices and any space that generates or suffers from high noise levels.
It is fire rated to both Crib 5 and UL94-HF-1, which matters in a studio full of expensive equipment — and more to the point, matters for the people in the room.
Specifications
| Foam grade | 25A (VE25 130 / KCME25DK – RX25/140) |
|---|---|
| Density | 25 kg/m³ |
| Firmness | 140 Newtons (ILD at 40% compression) |
| Fire behaviour | Crib 5 (BS 5852 Ignition Source 5) and UL94-HF-1 |
| Colour | Grey |
| Material | Polyurethane foam |
| Sheet sizes | 230 x 200cm (90.5" x 78.7") · 230 x 100cm (90.5" x 39.3") |
| Thicknesses | 1/2", 1", 1.5", 2", 3", 4" |
| Manufactured | United Kingdom |
What acoustic foam is for
- Recording studios and rehearsal rooms — controlling reflections and reverberation
- Home offices and podcast rooms — reducing echo on calls and recordings
- Noisy plant and machinery spaces
- Protective packing material — it works well in this role too
If your application falls under building fire regulations — ductwork, plant rooms, or a commercial fit-out requiring a Class 0 surface — use our Fireseal Class 0 foam instead, which carries an EN 13501-1 B-s1,d0 rating.
Questions about this foam
Will this soundproof my room?
No, and this is the most common misunderstanding about acoustic foam. It is a sound absorber: it reduces echo, reverberation and reflections inside a room, which makes the room sound better. It will not stop sound travelling through a wall to your neighbour — that requires mass and isolation, not foam. If your goal is to stop sound escaping, foam alone will not do it.
Does thickness matter?
Yes, considerably. Thicker foam absorbs more sound energy, and in particular absorbs lower frequencies that thin foam simply passes through. If you are treating a room for bass build-up, thicker is materially better.
What is UL94-HF-1?
A US flammability classification for low-density foam materials. HF-1 means the material stops burning within 3 seconds of ignition and afterglow lasts less than 30 seconds. It is a different standard from Crib 5 (a UK furniture test), and this foam carries both.
For the full explanation of density, firmness and fire ratings, see our foam FAQs. To compare every grade side by side, see our foam grade comparison.
Cut to order in our own UK factory. Next working day delivery is available to most of the UK — see our delivery page for timings to your area.