Meta-aramid acoustic felt 300 g/m², for sound-insulation panel cores
100% meta-aramid (aramid 1313) · Nonwoven felt, 300 g/m² · Core layer of sound-insulation panels for data centres and server rooms
A 300 g/m² meta-aramid felt for the middle layer of a sound-insulation panel — the core that does the acoustic and thermal work in data centres, server rooms and similar plant rooms. Inherently flame resistant, non-melting, supplied on material-level data.
- Inherently flame resistant — the property is in the fibre, not in a finish
- 300 g/m² nonwoven felt, for the core layer of a sound-insulation panel
- ASTM E84-2024: flame spread index 0, smoke developed index 35, Class A — a building-material test, not a PPE standard
- UL94-2024: V-0 in the vertical burn test
Application scenarios
A nonwoven felt for sound insulation, not a garment shell
This is an aramid felt: a nonwoven structure of meta-aramid (aramid 1313), supplied at 300 g/m². The fibre is inherently flame resistant — the flame resistance belongs to the polymer, not to a finish applied after the felt is made, so it cannot be washed out or worn off — and it does not melt or drip. Meta-aramid is used continuously at around 250 °C and only begins to decompose above 370 °C, and its limiting oxygen index of 28–32 is well above the 21% oxygen in ordinary air, so it self-extinguishes once the ignition source is removed.
The nonwoven build is the point of the material, and it is also its limit. A felt is a low-density, nonwoven structure: its strength is insulation — thermal, acoustic and filtration — rather than the mechanical strength a protective garment outer layer has to carry. That is why this felt is bought as a component rather than as a shell, and why which standard applies to it depends entirely on the job it is doing.
Two uses sit under two different standards systems and they are not interchangeable. Used as an industrial protection layer — a glove lining, a heat pad, a thermal lining, the inner layer of a protective hood — the felt sits in the protective-clothing system and is assessed as part of the assembly it goes into. Used as the core of a sound-insulation panel in a data centre or a server room it is a building material, and the test that applies to it is ASTM E84, the surface burning characteristics of building materials.
As a panel core the felt does two jobs at once: it is the acoustic middle layer of the panel build, and because meta-aramid is inherently flame resistant it does not introduce a burning component into that build. What we supply for it is material-level data. The panel construction, the facing materials and the finished panel’s own fire classification belong to the panel maker, and the certification of a protective article belongs to the maker who builds it — in both cases built on our material data rather than replaced by it.
Who makes it
Who makes the felt
Our textile manufacturing roots go back to 1972 and the company was established in Shantou, Guangdong in 2002. The aramid used in this felt comes out of a 30,000 m² integrated plant where the fibre is spun and converted under one roof rather than bought in and resold.
This page covers one construction: AF300, a 300 g/m² meta-aramid felt for the core layer of a sound-insulation panel. We supply the felt and its material-level data; the panel build and the finished panel’s own classification belong to the panel maker, and we are glad to give you the lot data the panel maker needs to establish them.
Technical data
Product information
The meta-aramid felt we produce for sound-insulation panel cores. AF300 carries the recorded specification; where our records hold no figure we write On request rather than an estimate.
| Model | Composition | Weight | Construction / width | Rating or key property | Source |
|---|---|---|---|---|---|
| AF300 | 100% meta-aramid (aramid 1313) | 300 g/m² | Nonwoven felt; roll width on request | ASTM E84-2024 Class A — FSI 0 / SDI 35 (building-material test, not a PPE standard) | Product record · SGS report |
Meta-aramid felt for sound-insulation panel cores
| Test | Method | Result | Report |
|---|---|---|---|
| Surface burning characteristics | ASTM E84-2024 | Class A — flame spread index 0, smoke developed index 35 | AJFTS25007493R02 |
| Vertical burn | UL94-2024 | V-0 | AJFTS25007493R01 |
| Sound absorption, impedance tube | GB/T 20247-2006 | NRC 0.10 — 100 Hz 0.01, 1600 Hz 0.19, 5000 Hz 0.36 | CNAS-accredited |
| Sound absorption, reverberation room | GB/T 16731-2023 | Weighted absorption coefficient αw 0.15 | CNAS-accredited |
| Restricted substances | RoHS 2011/65/EU as amended by (EU) 2015/863 | Tested on this construction | SGS |
| Substances of very high concern | REACH (EC) 1907/2006 — SVHC screening | Screened, 251 substances in the report | SGS |
| Material identity and thermal profile | FTIR ASTM E1252-98(2021), DSC ISO 11357-3:2018, TGA ISO 11358-1:2022 | Consistent with aramid fibre; decomposition onset 444.9 °C by TGA | SHMR251202956101 |
Measured test results
The Source column names where each figure comes from: Product record is the specification held for this model in our own product records; the measured results are third-party laboratory reports, and their report references are given so a buyer can ask for the document. The acoustic figures were measured on a 30 mm, 310 g/m² sample of the felt alone, which is why they are modest — read them with the panel build in mind, as the FAQ explains. No certificate number and no expiry date is printed on this page: those travel with the sales documents for your order. Where our records hold no figure we write On request rather than an estimate.
Made to order
Specification options
AF300 is the recorded construction for this felt — 300 g/m², nonwoven. Tell us the panel build the felt is going into and the roll form your line runs, and we will confirm the specification and the material data that fit it.
Standards and certification
This felt is supplied on material-level data. The entries below are the ones that apply to it in the application it is bought for; ASTM E84 is a building-material test and is marked as such.
- ASTM E84-2024 Surface burning characteristics of building materials. Measured on this felt: flame spread index 0, smoke developed index 35, giving Class A — the classification a sound-insulation panel core is bought against. This is a building-material test, not a PPE standard.
- UL94-2024 Vertical burn test. V-0 is recorded for this felt: afterflame and afterglow each within 10 s and the pair within 30 s, on the specimen tested.
- GB/T 20247-2006 Sound absorption by the impedance-tube method. Measured on the felt alone: NRC 0.10, rising to 0.36 at 5 kHz. The felt is the core layer of a panel, not a standalone absorber.
- GB/T 16731-2023 Sound absorption by the reverberation-room method. Measured weighted absorption coefficient αw 0.15 on the felt alone.
- RoHS Directive 2011/65/EU as amended by (EU) 2015/863. Tested on this construction; report available on request.
- REACH SVHC Regulation (EC) 1907/2006. Screened against the candidate list; report available on request.
- ISO 9001 Quality management system.
The felt is a nonwoven component, not a finished protective article, so no garment-level standard is claimed for it. Where the felt is used as a protective lining or a hood inner layer, the assessment belongs to the assembly it goes into; where it is used as a panel core, the finished panel’s own fire classification belongs to the panel maker. Test reports and certificate copies are available from our sales team on request, and where a standard-referenced result is required for your own approval file we arrange testing to the customer's requirement.
Frequently asked questions
What is the acoustic felt for?
It is the core layer of a sound-insulation panel — the middle layer of the panel build, used in data centres, server rooms and similar plant rooms where a rack or a room has to be kept quiet. The felt carries the acoustic and thermal job of that panel, and because meta-aramid is inherently flame resistant it does not add a burning component to the build. It is bought as a component for a panel, not as a finished panel and not as a garment.
Is the felt flame resistant, and what makes it so?
Yes, inherently. The flame resistance is a property of the meta-aramid polymer rather than a finish applied to the felt, so it cannot be washed out, worn off or removed by handling. The fibre does not melt or drip; it chars and builds a carbonised barrier. Its limiting oxygen index is 28–32 against the 21% oxygen in ordinary air, so it self-extinguishes once the ignition source is removed. Meta-aramid is used continuously at around 250 °C and only begins to decompose above 370 °C.
Is ASTM E84 a protective-clothing standard?
No, and we are careful to say so. ASTM E84 is the standard test for the surface burning characteristics of building materials, and it reports a class — A, B or C — from two indices: how far flame spreads and how much smoke is developed. On this felt the measured indices are 0 for flame spread and 35 for smoke, which is what places it in Class A. It applies here because the felt is bought as the core of a building panel, and it states nothing about protective clothing. Felt used as a protective lining is assessed through the protective-clothing route instead, as a component of the assembly it goes into.
What sound absorption does the felt actually give?
Measured on the felt alone, the figures are modest and we publish them as measured: by the impedance-tube method (GB/T 20247-2006) the noise reduction coefficient is 0.10, rising from 0.01 at 100 Hz to 0.19 at 1,600 Hz and 0.36 at 5,000 Hz; by the reverberation-room method (GB/T 16731-2023) the weighted absorption coefficient is 0.15. A 30 mm felt without an air gap is not a broadband absorber — that is simply what a thin, dense nonwoven does. What the felt contributes to a panel is its acoustic and thermal behaviour as the middle layer, and what has to meet an absorption target is the finished panel assembly: thickness, cavity depth, facing and the air gap are what move the number. Tell us the panel build and we will give you the felt data the panel maker needs to model it.
Can the felt be used as a protective lining or a hood inner layer?
Yes. Aramid felt is used as a glove lining, a heat pad, a thermal lining and the inner layer of a protective hood, and in that role it is assessed as a component of the assembly it goes into. What we supply for any of those uses is material-level data: composition, weight and the fibre properties of the lot. The assessment of the finished article, and its certification, belong to the maker who builds it.
What weight is the felt, and can the roll be set to our panel line?
AF300 is the recorded construction: a 300 g/m² nonwoven meta-aramid felt. Roll width and roll length are set with the order against the panel line the felt is cut on, so tell us the panel build and the roll form you run and we will confirm the specification and the material data for it. The class also covers laminated variants; we hold no recorded figure for those, so none is printed on this page.
How do I verify the material data before ordering?
Ask for the test report for the production lot. Composition, weight and the fibre data are recorded per lot. The surface burning, vertical burn, acoustic, RoHS and SVHC results are third-party laboratory reports and their references are printed in the measured-results table above, so you can name the report you want and we will send the document. Where your own approval file needs an additional independent result, third-party testing can be arranged, and where a standard-referenced result is required we arrange testing to the customer's requirement.
How does ASTM E84 Class A compare with EN 13501-1?
They are two regional systems answering the same question — how a material behaves in a fire — and a result on one is not a result on the other. ASTM E84 is the American surface-burning test for building materials: a specimen is exposed in a tunnel and the outcome is reported as a flame spread index and a smoke developed index, which together place the material in Class A, B or C. EN 13501-1 is the European reaction-to-fire classification: a material is placed in a class from A1 to F on a set of tests, and that class is qualified by two further ratings — smoke production (s1 to s3) and flaming droplets (d0 to d2). Our recorded result for this felt is the ASTM E84 one: flame spread index 0 and smoke developed index 35, Class A. No EN 13501-1 classification is held for the felt, and the finished panel's own fire classification belongs to the panel maker.
Why specify aramid felt rather than a polyester acoustic wadding for a panel core?
Because of what the core contributes to the fire performance of the panel. Polyester wadding is an organic fibre with a much lower thermal limit and it melts rather than charring, so it adds a fuel load to the build. Meta-aramid is inherently flame resistant — the property belongs to the polymer rather than to a finish — it does not melt or drip, it chars and builds a carbonised barrier, and its limiting oxygen index of 28–32 is above the 21% oxygen in ordinary air, so it self-extinguishes once the ignition source is removed. That is why an aramid core does not introduce a burning component into the panel, and why the felt keeps its structure at temperatures a polyester core cannot take. What the felt contributes is its own material data; the finished panel's fire classification is established by the panel maker.
What is the felt's thermal shrinkage, and how does it behave at temperature?
The figures we hold and publish are the fibre's own: meta-aramid is used continuously at around 250 °C, it only begins to decompose above 370 °C, and it does not melt — the thermal profile measured on this construction records a decomposition onset of 444.9 °C by TGA, and that report reference is printed in the measured-results table above. Dimensional change at temperature is a property of the construction and of the panel build rather than of the fibre alone, so no shrinkage figure is printed here. Where a programme needs one, tell us the construction and the temperature envelope and we will have the measurement made and reported for the lot.
Let’s talk about your fabric requirements
Tell us the application, the required weight and the standard you need to meet. Our technical team will come back with a matching fabric, the spec sheet and a quotation.