ISO 3262-22:2023

Overview

ISO 3262-22:2023 is an international standard specifying the requirements and test methods for flux-calcined kieselguhr, a siliceous material of diatomaceous origin used as an extender. This second edition updates and replaces the previous 2001 version, aligning with current quality and testing benchmarks. Produced by the International Organization for Standardization (ISO), it ensures consistency, reliability, and quality control across industries utilizing flux-calcined kieselguhr.

This standard is part 22 of the ISO 3262 series dealing with extenders - materials primarily used to enhance paint, rubber, and other product formulations by improving performance and reducing cost.

Key Topics

• Scope and Terms: Defines flux-calcined kieselguhr and outlines terminology according to ISO 18451-1.
• Specifications: Details the physical and chemical characteristics required for grades A and B flux-calcined kieselguhr including:
  • Minimum silica content (SiO₂) of 85%
  • Maximum loss on ignition at 0.5%
  • pH range of aqueous suspension between 7.0 and 10.5
  • Limits on matter soluble in water (max 1.0%), volatile matter at 105°C (max 0.5%)
  • Residue on sieve and specific surface area requirements
  • Oil absorption values for each grade
• Sampling: Specifies representative sampling procedures as per ISO 15528 to ensure uniformity and accuracy.
• Test Methods:
  • Volatile matter, water solubility, pH, oil absorption, sieve residue, and silica content determination
  • Silica content test involves acid treatments, ignition and weighing protocols with detailed reagent and apparatus specifications such as sulfuric acid, hydrofluoric acid, and muffle furnace conditions.
  • Tests are conducted in duplicate to guarantee precision.
• Test Reporting: Specifies mandatory inclusions such as product identification, compliance with ISO 3262-22:2023, test results, deviations, anomalies, and test dates.

Applications

Flux-calcined kieselguhr, regulated by ISO 3262-22:2023, serves as a critical extender material in various industrial applications:

• Paints and Coatings: Enhances durability, matte finish, and opacity while controlling gloss.
• Rubber Industry: Improves compounding characteristics and physical properties of rubber products.
• Plastics and Composites: Provides improved filler attributes, reducing raw material costs and modifying mechanical properties.
• Chemical Manufacturing: Utilized as an additive or extender, enhancing stability and performance of formulations.
• Filtration and Absorbents: Benefiting from its siliceous diatomaceous structure.

Adherence to this ISO standard ensures consistent quality, optimized performance, and compatibility in formulation processes, providing manufacturers and end-users confidence in the material’s integrity.

Related Standards

ISO 3262-22:2023 complements and references several related standards critical for comprehensive testing and classification of extenders:

• ISO 3262-1: Introduction and general test methods for extenders.
• ISO 787 Series (Parts 2, 3, 5, 7, 9): General methods for testing pigments and extenders including volatile matter, solubility, oil absorption, sieve residue, and pH.
• ISO 3696: Water purity standards for analytical laboratory use, ensuring testing accuracy.
• ISO 15528: Guidelines on sampling raw materials including pigments and extenders.
• ISO 18451-1: Terminology related to pigments, dyestuffs, and extenders.
• ISO 5794-1: Testing non-rubber components like silica used in rubber compounding.

These interconnected standards form an integrated framework for the quality assurance and proper characterization of extenders used across multiple industries.

By following the detailed specifications and analytical methods laid out in ISO 3262-22:2023, producers and users of flux-calcined kieselguhr can maintain high-quality standards, ensure compliance with international benchmarks, and enhance product performance in critical manufacturing processes.