ISO 19624:2018

Overview - ISO 19624:2018 (Bamboo grading for structures)

ISO 19624:2018, Bamboo structures - Grading of bamboo culms - Basic principles and procedures, defines standardized procedures for sorting round (pole) bamboo for structural applications. The standard covers both visual grading (based on observable characteristics) and mechanical/machine grading (based on non‑destructive measurements of properties that correlate with grade-defining values). ISO 19624 is applicable only to seasoned (dry) bamboo (moisture content ≤ 19%) and is intended to provide reproducible, documented grading processes - but it does not set acceptance criteria or limit values.

Key topics and technical requirements

• Scope and applicability: Grading rules for round/pole bamboo intended for structural use; applies only to seasoned bamboo.
• Grading concepts: Definitions of grade-determining properties (GDP) and indicating properties (IP) used to link observable or measurable attributes to structural capacity.
• Visual grading: Procedures and required visual checks - condition properties (cracks, fissures, indentations), geometric properties (diameter, wall thickness, taper, ovality) and grading rules that should be documented and demonstrated to correlate with intended grades.
• Machine grading: Requirements for non-destructive measurement systems, development of grading settings, and integration of a visual override process to exclude items with defects not detectable by machines.
• Initial and periodic evaluation: Sampling, testing and validation steps to develop grading rules and to verify ongoing conformity of graded bamboo to target properties.
• Documentation and identification: Requirements for product identification, documentation of grading operations, and traceability to source region and producer.
• Supplementary topics: Sampling sizes, secondary properties (e.g., density, moisture content), hybrid grading methods, and recommended checks on the grading process.

Practical applications and users

ISO 19624 is intended for organizations and professionals involved in the production, specification and use of structural bamboo:

• Producers and suppliers - to implement consistent grading at source and document quality.
• Structural engineers and designers - to specify graded bamboo elements with known grading procedures.
• Manufacturers of bamboo components - to establish intake and acceptance routines.
• Inspectors, certification bodies and quality managers - to audit grading processes and documentation.
• Researchers and standards developers - to develop grading rules and machine‑grading correlations for specific bamboo species and source regions.

Related standards

• ISO 22156 - Bamboo - Structural design
• ISO 22157‑1 - Bamboo - Determination of physical and mechanical properties - Part 1
• ISO 12122‑1 - Timber structures - Determination of characteristic values - Part 1

Keywords: ISO 19624:2018, bamboo grading, grading of bamboo culms, bamboo structures, visual grading, machine grading, seasoned bamboo, grade-determining property, indicating property, structural bamboo.