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White, stone wool micro-textured surface ceiling tile with high sound absorption.

Features and benefits:

  • Class A sound absorption and Class A1 fire safety (non-combustible).
  • Attractive surface finish.
  • Easy to clean with a vacuum or a damp cloth.
  • Available in semi-concealed and visible grid options.
  • Hygienic, stone wool provides no sustenance to micro-organisms, tested in accordance with JIS Z 2801:2000 and ASTM C 1338-96.
  • Can be fully recycled.
  • Manufactured in accordance with BS EN 13964.


Suitable for use in the following areas;

  • Offices.
  • Industry.
  • Education.
  • Leisure.
  • Retail.

Standard product features



Surface finish:


Sound absorption:

To ISO 11654: Up to 0.95 αw. Class A.

Reaction to fire:

To BS EN 13501-1, Class A1.

Fire performance:

The fire resistant properties of stone wool ensure Rockfon ceiling tiles provide fire protection in construction.

  • Tested and classified in accordance with EN 13501-2 and/ or national norms depending on requirements in national building codes.
  • Some sizes and edge details of Rockfon Koral™ can be used with various Chicago Metallic grids and Rockfon systems to create a 30 and/ or 60 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 and E 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 we recommend cleaning the entire surface evenly).


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™.
  • E15: Use with Chicago Metallic T15 2790 Click Grid to create Rockfon® System T15 E™.
  • E24: Use with Chicago Metallic T24 2890 Click Grid to create Rockfon® System T24 E™.


Grid colour:

Other colours available from the Rockfon Color-all tile range. Consult manufacturer for details.

NBS Specification

NBS Create logo
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™

Module size

[600 x 600 mm]
[1200 x 600 mm]

Tile thickness

[15 mm]
[20 mm]



Accessories/ Other requirements

[Not required]
[Rockfon® Rocklux®]
Sound insulating cap, designed to limit sound transmission. Consult manufacturer for details.

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