Overview
EN ISO 3262-18:2023 / ISO 3262-18:2023 specifies requirements and corresponding methods of test for precipitated sodium aluminium silicate, a specialty extender used in pigments and extenders. Published by CEN/ISO in 2023 (second edition), this part of the ISO 3262 series is harmonized as a European standard (EN ISO 3262-18:2023) and replaces earlier editions. It defines sampling, analytical procedures and reporting conventions for quality control and specification of this extender material.
Key topics and technical requirements
The standard focuses on practical, laboratory-based test methods and requirements, including:
- Sampling procedures to obtain representative test portions.
- Determination of silica content (principle, reagents, apparatus, procedure and expression of results), including loss on ignition considerations.
- Composition by spectrometry (quantitative determination of Al, Na and Si), with instructions for standards preparation, calibration and result calculation.
- Residue on sieve testing to measure coarse particles and ensure particle-size compliance.
- Precision metrics: repeatability (r) and reproducibility (R) statements are provided for key test methods.
- Referenced general methods: the document refers to related ISO methods for volatile matter, oil absorption, pH, and laboratory water quality to ensure harmonized testing.
- Test report requirements to standardize results and traceability.
Note: The standard defines methods and reporting but does not prescribe product formulation limits beyond what is stated in the normative text.
Applications and who uses it
EN ISO 3262-18 is intended for organizations that produce, specify, test or apply precipitated sodium aluminium silicate, including:
- Manufacturers of extenders and specialty fillers seeking consistent product specification and batch release testing.
- Quality control and analytical laboratories performing compositional and physical testing for compliance and R&D.
- Paints, coatings and inks formulators using extenders to adjust opacity, rheology and cost-in-use.
- Plastics, rubber, paper and adhesives industries where extender performance and purity affect product properties.
- Procurement, specification writers and regulators who require standardized test evidence for material acceptance.
This standard helps ensure consistent product quality, reproducible test results and clearer supplier–customer communication.
Related standards
- ISO 3262-1 - Extenders: Introduction and general test methods
- ISO 787 series - General methods for pigments and extenders (volatile matter, oil absorption, pH)
- ISO 3696 - Water for analytical use
Keywords: precipitated sodium aluminium silicate, EN ISO 3262-18, extenders, specifications and methods of test, pigments and extenders, silica content, spectrometry, sieve residue, quality control.