ISO 3262-9:2023 PDF

Overview

ISO 3262-9:2023 - "Extenders - Specifications and methods of test - Part 9: Calcined clay" specifies requirements and corresponding test methods for calcined clay used as an extender. The standard defines essential and conditional properties, sampling rules and laboratory procedures (including a referee particle-size method) to ensure consistent quality and reproducible test results for calcined clay powders.

Key topics and technical requirements

• Scope: Requirements and test methods specific to calcined clay (aluminium silicate produced by thermal dehydration of natural clay).
• Composition tests: Minimum aluminium silicate content (Al2O3·2SiO2) determined by X‑ray fluorescence or alkaline fusion (methods listed in the standard).
• Physical limits by grade (A, B, C):
  • Residue on 45 µm sieve (max): 0.02% (A), 0.05% (B), 0.1% (C) - ISO 787‑18.
  • **Particle size