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Dual layer stone wool tile with an inner high performance membrane for sound insulation and absorption.

Features and benefits:

  • Class A sound absorption and Class A2-s1,d0 fire safety.
  • Attractive to the visible side, with a smooth, deep matt finish.
  • The 50 mm thickness and high performance membrane on the reverse side help to reduce the transmission of noise from room to room.
  • Lightweight.
  • Durable, ensuring resistance to dirt and everyday wear and tear, extending the product lifetime.
  • Easy to clean with a damp cloth or vacuum cleaner.
  • Easy to install and cut.
  • Available in concealed, semi-concealed and visible grid options.
  • Hygienic; stone wool provides no sustenance to micro-organisms.
  • Includes durable painted edges.
  • Can be fully recycled.


Suitable for room to room sound insulation and absorption in areas such as:

  • Office environments where privacy and acoustic comfort are important.
  • Healthcare.
  • Education.

The recommended installation system for this product is Rockfon® System dB™ - consult manufacturer for details.

Standard product features


Super white (L value: 94.5).


50 mm.


7.9 kg/m².

Surface finish:

  • Visible side: Smooth, deep matt, white painted fleece.
  • Rear side: Back fleece

Sound absorption:

To ISO 11654: 0.95 αw. Class A.

Sound insulation:

  • Direct sound insulation: 25 dB Rw.
  • Room to room sound insulation: 46 dB.

Reaction to fire:

To BS EN 13501-1: A2-s1,d0.

Fire performance:

Some sizes and edge details of Rockfon® Blanka™ dB 46 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 and sag resistance:

  • Dimensionally stable, even at humidity levels of up to 100% RH.
  • No visible deflection in high humidity.

Light reflection:

Light reflection: 87% (Light Diffusion: >99%).


Rockfon tiles with A, D and E edges can be demounted.

Thermal insulation:

  • Thermal conductivity (K-Value): 40 W/mK.
  • Thermal resistance (R-Value): 1.25 m²K/W.


  • 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).
  • Wet scrub resistance to EN ISO 11998: 2007: Class 1.


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:

  • A24: Use with Chicago Metallic T24 2890 Click Grid to create Rockfon® System T24 A™.
  • D: Use with Chicago Metallic T24 2890 Click Grid to create Rockfon® System T24 Stepped Z D™ or Rockfon® System XL T24 D™.
  • 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™.

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

NBS Buliding logo
This product is associated with the following NBS clauses:

Product specification

An important note about specifying





+44 (0)208 2227457

Product reference

Rockfon Blanka® dB 46

Module size

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


Available with 600 x 600 mm only.

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