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White, stone wool, smooth surface tile for sound absorption and insulation.

Features and benefits:

  • Class B sound absorption and Class A2-s1,d0 fire safety.
  • Attractive to the visible side, with a smooth, deep matt finish.
  • The 25 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 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 in areas such as:

  • Flexible office layouts where confidentiality is not an issue.
  • 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).


25 mm.


3.4 kg/m².

Surface finish:

  • Visible side: Smooth, deep matt, white painted fleece.
  • Rear side: High performance membrane.

Sound absorption:

To ISO 11654: 0.80 αw. Class B.

Sound insulation:

  • Direct sound insulation: 19 dB Rw.
  • Room to room sound insulation: 35 dB.

Reaction to fire:

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

Fire performance:

Some sizes and edge details of Rockfon® Blanka™ dB 35 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 and light diffusion:

  • Reflection: 87%.
  • Diffusion: >99%.


Rockfon tiles with A and E edges 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).
  • 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™.
  • 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

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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 Blanka® dB 35

Module size

[600 x 600 mm]
[1200 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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