Overview
SIST EN ISO 3262-16:2023 is the latest European and international standard specifying the requirements and test methods for aluminium hydroxides used as extenders in various industries. Published by CEN and ISO in 2023, this standard supersedes the previous 2000 edition, offering updated and precise criteria for the quality, physical properties, and testing procedures related to aluminium hydroxide materials.
Aluminium hydroxides, primarily comprising gibbsite (Al(OH)₃) and related compounds like bayerite and boehmite, serve as key extender pigments in applications such as paints, rubber, and plastics. This standard ensures uniformity, reliability, and safety in production and quality control processes worldwide.
Key Topics
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Scope and Applicability
Defines aluminium hydroxides, including crystallized and ground forms, and their relevant characteristics as extenders.
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Essential Requirements
Details mandatory specifications such as:
- Particle size distribution and residue on sieves
- Median particle sizes tailored to different grades
- Minimum specific surface area requirements for some grades
- Resistivity of aqueous extracts
- pH value ranges for aqueous suspensions
- Limits on matter volatile at 105 °C
- Apparent density after tamping
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Test Methods
Referenced standardized methods include:
- ISO 787 series (testing for volatile matter, sieve residue, pH, tamped volume, resistivity)
- ISO 5794-1 (specific surface area by non-rubber test methods)
- ISO 15528 (sampling methods)
These promote consistency and accuracy in the evaluation of aluminium hydroxide properties.
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Conditional Requirements
Lightness or colorimetric properties are subject to agreement between interested parties, allowing for customization based on application needs.
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Sampling and Reporting
Specifies rigorous procedures for obtaining representative product samples and mandates comprehensive test reporting, including identification details, compliance status, methods used, and anomalies.
Applications
Aluminium hydroxides standardized under SIST EN ISO 3262-16:2023 play a vital role as extender pigments in:
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Paints and Coatings
Enhancing opacity, durability, and corrosion resistance without compromising flow or finish.
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Rubber Compounding
Acting as fillers to improve mechanical properties and processing stability.
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Plastics and Polymers
Offering cost-effective bulk and performance enhancement while maintaining chemical inertness.
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Adhesives and Sealants
Contributing to formulation stability and rheological control.
By adhering to this standard, manufacturers and users can ensure material consistency, optimize product performance, and align with international quality benchmarks.
Related Standards
SIST EN ISO 3262-16:2023 is part of the broader ISO 3262 series covering extenders and pigments. Key related standards include:
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ISO 3262 Series
Other parts that regulate different types of extenders such as calcium carbonate, kaolin, or talc.
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ISO 787 Series
General methods of test for pigments and extenders relevant across multiple materials.
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ISO 5794-1
Non-rubber tests for silica and hydrated fillers, applicable for comparative surface area analysis.
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ISO 15528
Sampling techniques for paints, varnishes, and raw materials, ensuring representative testing.
Compliance with these interconnected standards supports comprehensive quality control and specification compliance for extenders in industrial applications.
Keywords: aluminium hydroxide, extenders, ISO 3262-16, CEN standard, pigment specifications, test methods, particle size, surface area, resistivity, pH value, sampling, quality control, paint extenders, rubber fillers, plastic additives.