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White, stone wool micro-textured tile for optimum acoustic performance.

Features and benefits:

  • Class C sound absorption and Class A1 fire safety.
  • Attractive to the visible side, with a special micro-textured finish.
  • Provides high sound absorption at low frequencies, and low sound absorption at high frequencies.
  • Easy to clean with a damp cloth or vacuum cleaner.
  • Hygienic; stone wool provides no sustenance to micro-organisms.
  • Includes painted edges.
  • Can be fully recycled.
  • Manufactured in accordance with EN 13501-2.


Suitable for use in the following areas:

  • Concert and lecture halls for optimum acoustic performance.
  • Educational institutions.

Consult manufacturer for details on recommended installation systems. Install with Koral™ for optimum acoustics.

Related literature

The following content references this product:

Standard product features


15 mm.


1.8 kg/m².



Surface finish:

  • Visible side: Special, micro-textured white painted fleece.
  • Rear side: Back fleece.

Sound absorption:

To ISO 11654: 0.60 αw. Class C.

Reaction to fire:

To BS EN 13501-1: A1.

Fire performance:

Some sizes and edge details of Rockfon® Koral™ Tenor can be used with various Chicago Metallic grids and Rockfon systems to create a 30 minutes fire protecting ceiling in accordance with BS 476 Part 21 and Part 23. They can also be used to create a 30 minutes fire protecting membrane ceiling (integrity only) in accordance with BS 476 Part 22 – consult manufacturer for details.

Humidity resistance and dimensional stability:

  • Dimensionally stable, even at humidity levels of up to 100% RH.
  • As the humidity inside a building has no influence on Rockfon ceiling tiles, the ceiling can be installed at all temperatures ranging from 0-40ºC. No acclimatisation is necessary.
  • Retains superior properties even in infrequently heated and unheated rooms.
  • Precautions should be taken to avoid condensation risks.
  • In accordance with BS EN 13964, predominantly classified as class 1/C/0N. Certain module sizes are class 2/C/0N.

Light reflection:

To ISO 7724-1: 86%.


Rockfon tiles with A edge can be demounted.


  • Vacuum: The surface can be vacuum cleaned with a soft brush attachment.
  • Damp cloth: The surface can be cleaned using a damp cloth or sponge with a slightly alkaline detergent (pH between 7 and 9) without alcohol, ammonia or chlorine (this may render the surface slightly shinier, so a thorough clean is recommended).


Awarded the Finnish M1 emission classification for building materials and the Danish Indoor Climate Label for low VOC emission products.

Compatible edges, grids and systems:

  • A15: Use with Chicago Metallic T15 2790 Click Grid to create Rockfon® System T15 A™.
  • A24: Use with Chicago Metallic T24 2890 Click Grid to create Rockfon® System T24 A™.

NBS Specification

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This product is associated with the following NBS Create clause:
45-80-40/330 Mineral fibre infill units

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying





+44 (0)208 2227457

Product reference

Rockfon® Koral™ Tenor

Module size

600 x 600 mm



Manufacturer details

14th Floor,
Chiswick Tower,
389 Chiswick High Road,
London, W4 4AL
Tel +44 (0)208 2227457
Fax +44 (0)208 2227458
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NBS National BIM Library