Product Benefits

  • Acoustic absorption: αw = 0.95
  • Reaction to fire: A1
  • Light reflection: coefficient
  • 100% flat irrespective of the moisture content
  • Reduction in artificial lighting needs
  • Natural light intake of 6%
  • High density panel
  • 15-year warranty

Caracteristics & Performance

Acoustic absorption  
Tonga® E 20


  • Light reflection: The light reflection coefficient is for white.
  • White: L = 94.8% - according to ISO 11664-4.
  • Gloss: Matt - The gloss value is - according to ISO 2813.
  • Light diffusion: 100% of the light is diffused.
  • Natural light intake: 6% improvement in natural light distribution.
  • Lighting needs: 11% reduction in artificial lighting needs.

Fire reaction

  • According to EN 13501-1: Euroclass A1

Fire resistance

  • Tonga® E 20 ceilings (600 x 600 mm) installed on a T24 Quick-Lock® grid (see benchmark test report) satisfy the requirements of Section CO13 in the French fire regulations for public-access buildings.
Classification Modules (in mm) Load-bearing structures Additional insulation
REI 30 600 x 600 Concrete, Steel No
REI 30 600 x 600 Timber, Concrete, Steel 160 mm Eurolène® 603 + 0 to 200 mm of insulation

  • Tonga® E 20 ceilings (600 x 600 and 1,200 x 600 mm) installed on a T24 Quick-Lock® grid (see benchmark test report) are SF30 according to Belgian standard NBN 713-020.

Thermal-acoustic insulation

  • To increase the thermal-acoustic insulation, you are advised to lay insulation of 0 to 200 mm (max R ≈ 5 m² K/W) bare or with an aluminum vapor barrier.

Humidity performance

  • 100% flat irrespective of the moisture content.


Environment and health


  • Mineral wool is recyclable, and the vast majority of production waste is recycled. The recycled content of our Tonga® E 20 panels is 45%.
  • For projects based on NF HQE™, LEED® and BREEAM® construction principles, the verified environmental and health product declarations are available at Please contact us for more information about environmental certification.
  • Eurocoustic is certified to ISO 14001: 2004 "Environmental Management Systems".


  • Stone wool panels are manufactured with fibers exempt from the carcinogenic classification (European Regulation 1272/2008 as amended by European Regulation 790/2009). According to the International Agency for Research on Cancer, mineral wool is not classifiable as to its carcinogenicity to humans (Group 3).

CE Marking

  • DoP no.: 0007-05.

Indoor Air Quality

  • Products Tonga® E 20 are class A.

Installation & Cleaning


  • Installation must conform to the requirements of the DTU 58.1 code of practice, the NF P 68203-1 and 2 standards and other applicable standards and codes of practice according to the type of room.
  • You are advised to ensure that air can circulate between the rooms and the plenum to balance the temperature and pressures on each side of the ceiling.
  • Tonga® E 20 ceilings are fitted on T15 - T15 joint creux - T24 grids.
  • Tiles can be cut with a craft knife without generating any noise or dust.


  • The surface of Tonga® E 20 ceilings does not retain dust, which makes them easier to clean.
  • Tonga® E 20 ceilings can be cleaned using light brush / vacuum cleaner.
  • This type of cleaning will help extend the service life of Tonga® E 20 ceilings.

Colors & Dimensions


Our commitments

Fast and flexible logistics, technical assistance, customer service: Saint-Gobain Eurocoustic accompanies you on your projects on a daily and long-term basis.

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Reinvent your ceilings with our new colors

A selection of 40 colors

6 new graphical options

Custom Colors service

Print your own visuals

Visual consistency between tiles and grids