Diathonite Acoustix+

Eco-Tech Building Solutions

Diathonite Acoustix+

Diathonite Acoustix+ is a sound-absorbing cork plaster for walls and ceilings. Its open, porous surface absorbs sound in instead of bouncing it back: NRC 0.75 at 3 cm, with absorption...

Diathonite Acoustix+ is a sound-absorbing cork plaster for walls and ceilings. Its open, porous surface absorbs sound in instead of bouncing it back: NRC 0.75 at 3 cm, with absorption above 80% through the 600–1500 Hz band. Cork, clay and lime keep it breathable, anti-mould and A1 fire-rated. Spray it in cinemas, auditoriums, places of worship and open workspaces. Finish with Argatherm Acoustix where a smooth surface is wanted.

Key Features

  • BREEAM Exemplary Level, Eurofins tested
  • +3 dB Rw over traditional plaster
  • R’w ≥ 51 dB measured on a real partition
  • Absorption class C at 3 cm
  • Bacteriostatic lime base
$312.40

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Technical Details

Specifications

Technical Performance

Product specifications

Technical Documents

9 documents

Certifications

8 certifications

Key Features

Product highlights

Application

How to apply

Coverage & Yield

Application rates

FAQs

Common questions

Product Brochure

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Technical Performance

Format Powder
Yield 4.0 kg/m² per 10 mm thickness (±10%), 2.08 lb/ft² per inch thickness (±10%)
Density 400 kg/m³ (±30%), 24.9 lb/ft³ (±1.87%)
Grain Size 0 – 3 mm, 0 – 0.11 in
Application Temperature +5°C to +30°C (+41°F to +95°F)
Workability 40 min
Thermal Conductivity (λ) 0.075 W/mK (UNI EN 1745, category T1)
Thermal Resistance (R) 0.133 m² K/W for 1 cm thickness (UNI 10355)
Vapour Permeability Coefficient (µ) 4 (UNI EN 1015-19), highly breathable
Compressive Strength 4.0 N/mm² (EN 998-1, category CS III) / 580.51 psi (EN 998-2, M 2.5)
Minimum Thickness for Application 15 mm / 0.6 in
Maximum Thickness for Each Layer 30 mm / 1.18 in
Maximum Thickness for Ceiling Applications 20 mm / 0.8 in per layer, 30 mm / 1.18 in overall
Flexural strength 1.6 N/mm² | 232.06 psi
Adhesion to brick 0.252 MPa
Noise reduction coefficient (NRC) 0.75 for 30 mm thickness
Sound absorption class C
Sound insulation increase 3 dB vs traditional plaster
Acoustic absorption (600-1500 Hz) α > 70%
Fire reaction Euroclass A1
Drying time 10-15 days
Package Paper Bag
Weight 19 kg (41.9 lbs)

Technical Documents

  • Diathonite Acoustix Technical Data Sheet

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  • Diathonite Acoustix Technical specification Doc

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  • Diathonite Acoustix Safety data sheet doc

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  • Diathonite-Acoustix_Declaration_of_performance_EN_998-1_CE_4

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  • Diathonite_Acoustix_Declaration_of_performance_BS_998-1_UKCA_2_2

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  • Diathonite Acoustix Declaration of performance BS_998-2_UKCA

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  • Diathonite_Acoustix_LEED_and_Well

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  • Diathonite Acoustix Declaration of performance EN 998 2 CE 6

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  • EPD Verification for Diathonite Evolution, Diathonite Acoustix, Diathonite Acoustix+, Diathonite Deumix+, Diathonite Screed, Diathonite Thermactive.037, Diathonite Sismactive

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Certifications

Key Features

  • BREEAM Exemplary Level, Eurofins tested
  • +3 dB Rw over traditional plaster
  • R’w ≥ 51 dB measured on a real partition
  • Absorption class C at 3 cm
  • Bacteriostatic lime base

Application

  • Trowel
  • Platering Machine
  • Coverage & Yield

    Package: 19 kg

    Coverage:
    • 4.0 kg/m² per 10 mm of thickness (±10%)
    • 2.08 lb/ft² per inch of thickness (±10%)

    Application Range:
    Minimum: 15 mm (0.6 in)
    Maximum per layer: 30 mm (1.18 in)

    Yield Per 19 kg (41.9 lb) package:
    • At 15 mm thickness: ≈ 3.2 m² (34 ft²)
    • At 20 mm thickness: ≈ 2.4 m² (26 ft²)
    • At 30 mm thickness (max per layer): ≈ 1.6 m² (17 ft²)

    Frequently Asked Questions

    What is Diathonite Acoustix+ used for?
    It's designed to reduce sound transmission in commercial and multi-unit buildings — ideal for walls and ceilings.

    How does it improve acoustics?
    The natural cork base absorbs sound waves, reducing both airborne and impact noise.

    How thick should it be applied?
    Typically 15–30 mm, depending on structural and insulation needs. Can be applied in multiple layers.

    What is the yield per package?
    5 m² (53.7 ft²)

    Can it be used in schools or offices?
    Yes — it's perfect for educational and commercial spaces where noise control is critical.

    Is it fire-resistant?
    Yes — classified as A1 (non-combustible) under EN 13501-1.

    Can I paint over it?
    Yes — once cured, it can be painted with mineral or lime-based paints.

    Do I need a primer?
    It depends on the substrate.
    Use Aquabond on smooth, non-absorbent surfaces (e.g., concrete, painted walls, plasterboard).
    Not needed on absorbent masonry (brick, stone, old plaster).

    How is it installed?
    By hand trowel or spray machine. Professional installation recommended.

    Product Brochure

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