ISO 24025-2:2020

Overview

ISO 24025-2:2020 is an international standard published by the International Organization for Standardization (ISO) that specifies the methods for preparing test specimens and determining the properties of sulfone polymer moulding and extrusion materials. This standard provides comprehensive guidance on how to handle test materials, condition them prior to moulding, and condition test specimens before conducting property measurements. It aims to ensure reproducibility and comparability of test results for sulfone-based thermoplastic polymers used in moulding and extrusion applications.

The standard covers preparation techniques such as injection moulding under specified conditions and outlines various mechanical, thermal, rheological, optical, and electrical property tests suited for these high-performance polymer materials. ISO 24025-2:2020 builds upon general plastics testing methods found in ISO 10350-1 and aligns with designatory properties detailed in ISO 24025-1.

Key Topics

• Specimen Preparation: Instructions for drying materials to a moisture content maximum of 0.05% before moulding and detailed injection moulding parameters for PSU, PESU, and PPSU polymers ensure standardized specimen creation.

• Conditioning of Specimens: Specific conditioning protocols for different test types are given, such as drying at 160°C for two hours for rheology and thermal analysis specimens, and storage at 23 ± 2°C with 50 ± 10% relative humidity before mechanical or other testing.

• Property Determination Methods:

  • Mechanical Properties: Tensile modulus, flexural modulus, Charpy impact resistance, and creep behavior tests following ISO 527-2, ISO 178, ISO 179, and ISO 899-1.
  • Thermal Properties: Glass transition temperature (DSC), Vicat softening temperature, and deflection temperature under load are covered.
  • Rheological Properties: Melt flow rate testing at specified temperatures and loads per ISO 1133-1.
  • Fire Behavior: Flammability classification using IEC and ISO standards.
  • Electrical Properties: Relative permittivity, dielectric rigidity, surface and volume resistivity tests essential for applications requiring electrical insulation.

• Test Conditions and Atmospheres: Testing is conducted in standardized atmospheres defined by ISO 291 to maintain consistency and reliability of data.

• Reference Norms: The standard cites numerous related ISO and IEC documents covering testing methodologies and material characteristics, ensuring comprehensive methodological alignment.

Applications

ISO 24025-2:2020 is critical for manufacturers, researchers, and quality control laboratories working with sulfone polymer materials such as PSU (Polysulfone), PESU (Polyethersulfone), and PPSU (Polyphenylsulfone). These polymers are widely used for moulded and extruded parts that demand excellent thermal stability, mechanical strength, and chemical resistance. Key application areas include:

• Automotive components requiring high-performance plastics with stable mechanical and thermal properties.
• Electrical and electronic devices where precise dielectric properties and flame resistance are necessary.
• Medical devices benefiting from sterilization compatibility and material reliability.
• Industrial machinery components exposed to elevated temperatures and aggressive environments.

Implementing ISO 24025-2:2020 testing procedures helps ensure material compliance, performance consistency, and supports international trade by providing standard reference data.

Related Standards

• ISO 24025-1: Specifies designatory properties for sulfone polymer materials and complements Part 2's testing methods.
• ISO 10350-1: General test methods for intrinsic plastics properties common across thermoplastics.
• ISO 294 (Parts 1, 3, 4): Injection moulding of thermoplastic test specimens, including shrinkage measurement.
• ISO 527-2: Tensile testing conditions for plastics for moulding and extrusion.
• ISO 75-2: Determination of temperature of deflection under load.
• ISO 4589-2: Oxygen index testing for flame retardancy.
• IEC 60695-11-10: Standardized tests for material flammability using flame exposure.
• ISO 291: Standardized conditioning atmospheres for testing plastics.

Adhering to these related standards alongside ISO 24025-2:2020 ensures robust and harmonized evaluation of sulfone polymer materials across diversified industrial sectors.

Keywords: ISO 24025-2:2020, sulfone polymers, moulding materials, extrusion materials, test specimen preparation, polymer testing, mechanical properties, thermal properties, rheological properties, plastics standard, injection moulding, polysulfone, polyethersulfone, polyphenylsulfone, plastics conditioning, standardized testing, ISO plastics standards.