Overview - ISO 2509:1989 (Sound-absorbing expanded pure agglomerated cork in tiles)
ISO 2509:1989 specifies physical and acoustic characteristics, test methods and handling requirements for sound‑absorbing expanded pure agglomerated cork in tiles (acoustic cork tiles). It is a technical revision of the first edition and references common measurement conditions (20 °C ±2 °C, 65 % ±5 % RH) and reverberation‑room acoustic testing per ISO 354. The standard covers dimensional tolerances, moisture limits, mechanical strength, acoustic absorption measurement particulars, sampling, packaging and marking.
Key topics and technical requirements
- Dimensions and tolerances
- Typical tile formats: 300×300 mm, 500×500 mm, 300×600 mm, 1 000×500 mm.
- Minimum thickness: 20 mm.
- Length/width tolerance: +0.4 % with a maximum of 3 mm.
- Thickness tolerance: ±0.4 mm.
- Squareness (edge right‑angle)
- Visible edges must form right angles; squareness deviation ≤ 0.3° (1.5 mm).
- Moisture
- Moisture content (per ISO 2066) must not exceed 4 %.
- Flexural strength
- Bending rupture strength (per ISO 2077) ≥ 140 kPa for tiles ≥20 mm thick.
- Acoustic absorption
- Tiles tested in a reverberation room (ISO 354) with specified third‑octave center frequencies (100–4 000 Hz, list included in the standard).
- Results presented in tabular and graphical forms showing absorption per frequency band.
- Sampling and test specimens
- Random sampling covering 10–12 m²; three tiles taken for flexural strength and moisture tests.
- Presentation, packaging and marking
- Tiles may have grooves, profiles, perforations or chamfers.
- Pack so different sizes/presentations are not mixed; mark packages with product ID, dimensions, producer name and country of origin.
Applications and who uses ISO 2509:1989
- Manufacturers of acoustic cork tiles use the standard to design, produce and certify product conformity.
- Acoustic consultants, specifiers and architects reference it when selecting sound‑absorbing cork tiles for room acoustics (offices, auditoria, recording rooms, public spaces).
- Test laboratories and quality control teams apply the specified test methods (ISO 354, ISO 2066, ISO 2077) and sampling procedures.
- Suppliers and logistics teams follow packaging and marking rules to ensure safe delivery and traceability.
Related standards
- ISO 354 - Acoustics: Measurement of sound absorption in a reverberation room (referenced for acoustic testing).
- ISO 633 - Cork - Vocabulary (definitions).
- ISO 2066 - Determination of moisture in expanded pure cork agglomerates.
- ISO 2077 - Determination of flexural rupture strength.
Keywords: ISO 2509:1989, acoustic cork tiles, sound‑absorbing expanded pure agglomerated cork, cork acoustic tiles, ISO 354, dimensional tolerances, moisture limit, flexural strength.