Overview
ISO 9862:2023 - Geosynthetics: Sampling and preparation of test specimens - defines general principles for taking samples of geosynthetics delivered to construction sites and for preparing laboratory test specimens from those samples. The standard applies to products supplied in rolls, expandable panels, and other forms; specimen-preparation principles apply to all geosynthetics. It replaces the 2005 edition and incorporates products not supplied in rolls.
Key topics and technical requirements
- Scope of sampling
- Apply sampling frequencies as agreed between parties for each product type.
- Selected rolls/panels should appear undamaged and wrapping intact (except for claim-related tests).
- Cutting and sample selection
- Do not use the first two turns of rolled products or the two outermost strips of expandable panels for sampling.
- Cut across the full width (perpendicular to machine direction for rolls) or parallel to the fully expanded direction for panels to obtain required sample length.
- For geosynthetic clay liners (GCL), follow guidance (ASTM D6072) - exclude the first and last 1.0 m of a roll and avoid the outermost layer material.
- Specimen preparation
- Distribute specimens evenly over the full width and length of the sample; maintain at least 100 mm from edges.
- Avoid specimens containing dirt, creases, holes, or other accidental defects (except for claim tests).
- For directional tests, avoid preparing multiple specimens in the same longitudinal/transverse orientation where possible; mark and preserve machine direction orientation on specimens.
- If cutting causes loose fragments or fraying, retain fragments with the specimen and report this.
- Storage and handling
- Maintain the physical condition of samples (e.g., moisture for clay barriers) during storage and transport.
- Store specimens in a dry, dark, dust-free place at ambient temperature; follow manufacturer recommendations where applicable.
- Reporting
- Sampling report must confirm compliance with ISO 9862, note deviations, defects, fragment loosening, directional constraints, and full product identification per ISO 10320.
Applications and users
ISO 9862 is essential for:
- Geotechnical and civil engineers specifying quality control procedures for liners, drainage and reinforcement systems
- Laboratory technicians preparing test specimens for tensile, permeability, puncture and other geosynthetic tests
- Contractors, site inspectors and quality assurance teams performing on-site sampling
- Manufacturers and suppliers documenting product conformity and handling claims
This standard ensures consistent, reproducible sampling and specimen preparation to support reliable test results and acceptance decisions in construction projects using geosynthetics.
Related standards
- ISO 10318-1 (geosynthetics terms and definitions)
- ISO 10320 (on-site identification)
- ISO 186 (sampling of sheet products) and ASTM D6072 (GCL sampling guidance)
