Product Benefits

  • Acoustic absorption: αw = 1
  • Reaction to fire: A1 for white and A2-s1, d0 for colors
  • Light reflection: coefficient
  • 100% flat irrespective of the moisture content
  • Thermal resistance: 1.10 et 1,10 m². K/W
  • Reduction in artificial lighting needs
  • Natural light intake of 6%
  • High density panel
  • Over 600 format and veil combinations
  • 15-year warranty

Caracteristics & Performance

Acoustic absorption  
Tonga® A 40


  • 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: 

  • For white: Euroclass A1
  • For colors and patterns: Euroclass A2-s1, d0

Fire resistance

  • Tonga® A 40 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® A 40 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.

Thermal resistance

  • Tonga® A 40 ceilings offer thermal resistance of:
Thickness Thermal resistance
40 mm 1.10 et 1,10 m². K/W

Resistance to bending

According to EN 13964 - Annex F, tensile strength is expressed according to two criteria: 

  • The maximum atmospheric conditions to which tiles may be exposed (humidity (%) and temperature (°C)) are expressed in classes from A to D:
Class  Exposure conditions
A Humidity ? 70%
Temperature ? 25°C
B Humidity ? 90%
Temperature ? 30°C
C Humidity ? 95%
Temperature ? 30°C
+ risk of condensation
D Harsher conditions than above
  • The type of load is expressed for a distributed load in N/m² (10 N/m² = 1 kg/m²).

Tonga® A 40 ceilings for exposure class C and all dimensions, including the largest, are classified as C/130N/m².


Environment and health


  • Mineral wool is recyclable, and the vast majority of production waste is recycled. The recycled content of our Tonga® A 40 panels is 45%.
  • For projects based on NF HQE™, LEED® and BREEAM® construction principles, EPD are available. Please Contact us
  • 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.: 0007-01, 0007-02 et
    • N° DoP : @@MARQUAGE_CE@@


Indoor Air Quality

  • Products Tonga® A 40 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® A 40 ceilings are fitted on T15 - T24 grids.
  • Tiles can be cut with a craft knife without generating any noise or dust.


  • The surface of Tonga® A 40 ceilings does not retain dust, which makes them easier to clean.
  • Tonga® A 40 ceilings can be cleaned using light brush / vacuum cleaner.
  • This type of cleaning will help extend the service life of Tonga® A 40 ceilings.

Colors & Dimensions



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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