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Model 40-3 combines a 40 mm slot pitch with 3 mm slots (5.0% perforation rate) and posts the strongest broadband curve in the grooved family — NRC-weighted absorption peaks at 0.86 in the mid band.
| Property | Value |
|---|---|
| Model | 40-3 (perforation rate 5.0%) |
| Structure | Substrate + finish + acoustic backing |
| Width | 133 / 197 mm |
| Length | 2440 mm |
| Thickness | 12 / 15 / 18 mm |
| Substrate | Standard / eco / flame-retardant / moisture-proof / MgO / ceramic-aluminium board |
| Finish | Melamine / wood veneer / fireproof veneer / paint |
| Back | Non-woven fabric / acoustic felt |
Model 40-3, laboratory reverberation-room data as published in the MST product catalogue.
| Frequency (Hz) | αs |
|---|---|
| 100 | 0.26 |
| 125 | 0.31 |
| 160 | 0.38 |
| 200 | 0.55 |
| 250 | 0.58 |
| 315 | 0.69 |
| 400 | 0.85 |
| 500 | 0.86 |
| 630 | 0.81 |
| 800 | 0.71 |
| 1000 | 0.67 |
| 1250 | 0.59 |
| 1600 | 0.58 |
| 2000 | 0.51 |
| 2500 | 0.51 |
| 3150 | 0.42 |
| 4000 | 0.41 |
| 5000 | 0.39 |
Octave-band average of the 250–2000 Hz bands (NRC) ≈ 0.65. Coefficients are quoted for the mounting described above; a different cavity depth or backing moves the curve, so confirm the build-up with us before fixing the specification.
Lecture halls, conference rooms, courtrooms and offices where speech clarity is the priority.
| Item | Detail |
|---|---|
| Minimum order quantity | 300 m² |
| Production lead time | 15–25 working days from order confirmation |
| Packaging | 6 panels per carton, edge-protected |
| Container loading | 20′ GP ≈ 1,100 m² · 40′ HQ ≈ 2,600 m² |
| Terms | EXW Shanghai · FOB Shanghai · CIF on request |
| Payment | 30% deposit with order, balance against B/L copy by T/T; L/C at sight on request |
Component test reports are issued to our manufacturing partners rather than to MST. Authorised copies, including laboratory and certificate numbers, are released with every quotation.
A4 groove samples of the 28-4, 59-5, 40-3 and 14-2 patterns are despatched free of charge within 7 working days.
Email your drawing, panel schedule or a square-metre count to sales@mstacoustics.com, or send the enquiry form on this page. We reply within one working day with pricing, lead time and freight options. Datasheets, colour charts and installation guides are collected in our technical resources library.
What cavity depth gives the published curve?
The published coefficients assume the panel fixed to keels with acoustic cotton in the cavity.
Is a ceiling version available?
Yes — the same panel is used horizontally on keels or as a suspended ceiling.
Can you supply FSC-certified board?
Yes — FSC®-certified substrates are available under our CoC.
Clear sound, clear mind.
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