ISO 24023-2:2020

Overview

ISO 24023-2:2020 is an international standard developed by ISO that specifies the methods for preparing test specimens and determining the properties of plasticized poly(vinyl chloride) (PVC-P) moulding and extrusion materials. This standard establishes the procedures for handling materials before moulding, conditioning test specimens, and ensures reproducible, comparable test results. It integrates general test methods from ISO 10350-1 alongside additional specific tests relevant to PVC-P materials, providing a comprehensive framework for material characterization.

Key Topics

• Specimen Preparation Methods: Detailed guidance on preparing PVC-P test specimens through compression moulding after plastification using a two-roll mill. The standard includes exact temperature, time, and pressure conditions to optimize material consistency.

• Material Conditioning: Specifies conditioning of test specimens at 23 °C ± 2 °C and 50% ± 10% relative humidity for a minimum of 48 hours, aligning with ISO 291 to stabilize test results.

• Test Property Determination: Lists mechanical, thermal, electrical, and other relevant properties to be measured, including:

  • Tensile stress at specific deformation rates (ISO 527-1, ISO 527-2)
  • Shore hardness (ISO 868)
  • Torsional rigidity as a function of temperature (ISO 458-2)
  • Volumetric mass density (ISO 1183-1)
  • Electrical resistivity (IEC 62631-3-1)
  • Plasticizer loss (ISO 176)
  • Ash content in PVC (ISO 3451-5)

• Standardized Testing Environment: Emphasizes conducting tests under standard atmospheric conditions for temperature and humidity to ensure consistency.

• Use of Relevant Normative References: Connects with complementary ISO standards like ISO 293 for compression moulding and ISO 2818 for specimen machining, facilitating aligned test practices across industries.

Applications

ISO 24023-2:2020 is crucial for manufacturers, quality control labs, and technical experts working with PVC-P materials used in moulding and extrusion processes. Key applications include:

• Quality Control: Ensures that plasticized PVC materials meet material property requirements before release.
• Material Development: Guides R&D efforts in formulating PVC-P compounds with predictable mechanical and thermal behaviors.
• Regulatory Compliance: Assists businesses in meeting international product standards for PVC-based moulded or extruded goods.
• Product Testing: Enables testing of raw materials or finished products such as flexible films, tubing, and profiles, ensuring durability and performance.
• Comparative Analysis: Facilitates benchmarking PVC-P against other thermoplastics using selected properties from ISO 10350-1.

Related Standards

• ISO 10350-1: Provides general test methods and intrinsic property acquisition for molding materials, forming the basis for numerous property tests in ISO 24023-2.
• ISO 293: Specifies compression moulding of thermoplastic specimens, referenced for specimen preparation guidance.
• ISO 2818: Covers machining of plastic test specimens, applicable when further specimen shaping is required.
• ISO 291: Defines standard conditioning atmospheres essential for specimen preparatory steps.
• ISO 24023-1: Describes PVC-P material designation systems and specifications, supporting material classification alongside physical testing.
• IEC 62631-3-1: Pertains to measuring dielectric and resistive properties relevant for PVC-P's electrical performance.

Keywords: ISO 24023-2, plasticized PVC, PVC-P, moulding materials, extrusion materials, test specimen preparation, property determination, compression moulding, plasticizer loss, Shore hardness, tensile strength, specimen conditioning, ISO plastics standards.