Overview
ISO 24369:2005 is an international standard developed by the International Organization for Standardization (ISO) that establishes a precise, aqueous-based wet sieving method for determining the content of coarse particles in fine ceramic powders and suspensions. Focused on fine ceramics-including advanced and technical ceramics-this method reliably quantifies coarse particles larger than 25 µm (passing a 500 mesh sieve), which critically influences the quality and performance of ceramic materials. The standard ensures accurate measurement for powders in both micrometre and submicrometre size ranges where coarse particle content exceeds 10 mg/kg.
Key Topics
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Scope and Applicability
Specifies a wet sieving procedure for fine ceramic powders and suspensions using an aqueous medium to isolate and quantify coarse particles, suitable for powders with over 10 mg/kg coarse particle content.
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Definitions
- Coarse particles: particles or aggregates retained on a 25 µm mesh sieve.
- Suspension: ceramic powder dispersed in water.
- Solid content: ratio of powder mass to total suspension mass.
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Equipment Requirements
Utilizes precise apparatus including a 500 mesh stainless steel sieve, analytical balance with 0.1 mg readability, ultrasonic bath, magnetic stirrer with PTFE-coated stir bar, oven (105 °C ± 5 °C), desiccator or vacuum chamber, pipette, and glass beaker.
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Sampling and Preparation
Emphasizes sample homogeneity through mild agitation (without ultrasound to prevent agglomerate breakup) and accurate determination of solid content before testing.
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Wet Sieving Procedure
Steps for washing, drying, weighing the sieve, pouring and rinsing the suspension through the sieve while preventing loss of material, ensuring complete suspension transfer, and managing sieve blockage.
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Mass Measurement and Calculations
Protocol for weighing dried sieves before and after sieving to determine the mass of retained coarse particles, and formulas for calculating the percentage of coarse particles expressed in mg/kg.
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Reporting
Standardized data sheets for recording laboratory conditions, powder and suspension characteristics, weighing results, and final coarse particle content.
Applications
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Quality Control in Fine Ceramics Manufacturing
Enables manufacturers to monitor and control coarse particle content in ceramic powders, ensuring consistency and performance of advanced ceramic components.
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Research and Development
Useful for materials scientists and engineers analyzing particle size distributions during the development of new ceramic materials.
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Industrial Process Optimization
The method supports process adjustments to reduce undesired coarse particles, thus improving sintering behavior and mechanical properties of ceramics.
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Compliance and Standardization
Offers a standardized test method for specifying and verifying raw material quality in international trade and material supply chains.
Related Standards
- ISO 2060 – Determination of particle size by sieve analysis for granular ceramic materials.
- ISO/TC 206 Technical Committee standards on ceramic materials testing.
- ASTM standards on particle size distribution and wet sieving techniques.
- ISO 14644 Series – Cleanrooms and associated controlled environments, relevant for contamination control in ceramic powder handling.
Keywords: ISO 24369, fine ceramics, advanced ceramics, technical ceramics, coarse particles, ceramic powders, wet sieving, particle size analysis, ceramic suspension, ceramic quality control, particle content determination, wet sieve method, ceramic powder testing, analytical balance, ultrasonic bath, sieve drying, ceramic manufacturing standards.