Overview
EN ISO 13433:2025 - Geosynthetics: Determination of dynamic perforation (cone drop test) specifies a laboratory method to assess the resistance of geosynthetics to dynamic penetration by dropping a steel cone from a fixed height. Adopted by CEN (approved June 2025) and identical to ISO 13433:2025, this second edition updates tolerances and adds guidance on interpretation of results. The method is generally applicable to most geosynthetic products but notes careful consideration for some product types (e.g. GGR, GCE, GST, GBR).
Key topics and technical requirements
- Test principle: A stainless-steel cone is released in free fall onto a horizontally clamped specimen; penetration is quantified by inserting a graduated measuring cone into the resulting hole.
- Drop conditions: Cone dropped from 500 mm ± 2 mm onto specimen centre.
- Cone specifications:
- Impact cone: stainless steel, 45° tip angle, mass 1 000 g ± 5 g (including guide rod), polished surface and sufficient hardness.
- Measuring cone: graduated cone, mass 600 g ± 5 g, tip rounded (markings must remain readable).
- Clamping and specimen geometry:
- Clamping rings internal diameter: 150 mm ± 0.5 mm; gripping-zone margin ≤ 7 mm to avoid slippage or cutting.
- Specimen flatness must be maintained; bending is to be avoided.
- Five specimens per sample; specimen sampling/preparation per ISO 9862.
- Apparatus and setup: Rigid frame mounted on a hard, non-resilient surface with a release mechanism or guides that allow free fall without rotation; safety screen and protective layer recommended.
- Conditioning and environment: Standard test atmosphere - 20 °C ± 2 °C and 65 % ± 5 % RH (ISO 554). A specimen is conditioned when mass change between successive weighings (≥2 h apart) ≤ 0.25 %.
- Reporting: Test report includes specimen details, cone measurements, hole diameter (measured in mm), test conditions and any interpretation notes.
Applications and users
- Practical use: Evaluate puncture/perforation resistance of geotextiles, geomembranes and other geosynthetics exposed to dynamic impacts (installation risks, dropped objects, localized impacts).
- Who uses it:
- Manufacturers for product development and quality control
- Laboratories performing type and acceptance testing
- Specifiers and consultants assessing suitability of geosynthetics for infrastructure projects (roads, landfills, erosion control)
- Regulators and procurement teams requiring standardized performance data
Related standards
- ISO 554 - Standard atmospheres for conditioning/testing
- ISO 9862 - Sampling and preparation of test specimens (geosynthetics)
- ISO 10318-1 - Geosynthetics - Terms and definitions
- ISO 10320 - Geosynthetics - Identification on site
Keywords: EN ISO 13433:2025, geosynthetics dynamic perforation, cone drop test, geotextiles testing, dynamic penetration resistance.
