ISO 24024-2:2021

Overview

ISO 24024-2:2021 is an international standard published by ISO, specifying the standardized procedures for preparing test samples and determining properties of vinyl chloride homopolymer and copolymer resins (PVC resins). This document plays a crucial role in ensuring consistent, reproducible, and comparable evaluation of PVC resin quality. It outlines methods for sampling, conditioning, and testing to characterize the physical and chemical properties of PVC resins accurately.

This standard is vital for manufacturers, quality control laboratories, and regulatory bodies involved in PVC production and testing. It harmonizes test methods to improve product reliability and ensure compliance with international quality requirements.

Key Topics

• Sampling and Sample Preparation:
  The standard details how samples should be taken from resin batches to be representative and sufficient in quantity. It specifies preparation techniques, including the creation of standard pastes (formulations A and B) from resin samples, critical for certain viscosity and plasticizer absorption tests.

• Conditioning of Test Samples:
  ISO 24024-2 emphasizes the importance of conditioning test materials prior to testing under specified conditions to ensure accuracy and reliability of results.

• Properties and Test Methods:
  The standard lists essential physical and chemical properties required to characterize PVC resins, along with the corresponding test methods. These include:

  • Apparent density and compacted bulk density (ISO 60, ISO 1068)
  • Sieve analysis for particle size distribution (ISO 2591-1, ISO 1624, ISO 4610)
  • Measurement of impurities and foreign particles (ISO 1265)
  • Plasticizer absorption and pourability (ISO 4608, ISO 4574, ISO 6186)
  • Chemical composition including chlorine content, pH, volatile matter, residual vinyl chloride monomer (ISO 1158, ISO 1264, ISO 1269, ISO 6401)
  • Viscosity testing for both powder and paste forms (ISO 2555, ISO 3219, ISO 4575)

• Standard Paste Formulations:
  Two standard paste formulations (Formulation A and B) with bis-(2-ethylhexyl) phthalate (DOP) as a plasticizer are defined to prepare paste samples for viscosity and plasticizer-related testing, ensuring consistent measurement conditions.

Applications

• Quality Control in PVC Resin Production:
  Enables producers to assess key characteristics of homopolymer and copolymer vinyl chloride resins to maintain batch consistency and compliance with specifications.

• Research and Development:
  Used by R&D laboratories to reliably characterize new PVC formulations or additives under standardized conditions to evaluate performance or suitability for specific applications.

• Regulatory Compliance and Certification:
  Ensures test results are internationally recognized and accepted for regulatory submissions, certification, or trade purposes.

• Material Selection and Supplier Evaluation:
  Assists manufacturers and converters of PVC-based products in selecting appropriate resin grades based on standardized property data.

Related Standards

ISO 24024-2:2021 refers to and works alongside several other ISO standards that complement PVC resin testing:

• ISO 24024-1: General specifications for homopolymer and copolymer resins of vinyl chloride
• ISO 4612 & ISO 11468: Methods for preparing PVC pastes for test purposes
• ISO 2591-1: Test sieving methods using woven wire cloth and perforated plates
• ISO 1265: Determination of impurities and foreign particles in PVC resins
• ISO 1158: Chlorine content determination in vinyl chloride polymers
• ISO 6401: Gas chromatographic method for residual vinyl chloride monomer
• ISO 3219 & ISO 2555: Methods for viscosity determination in liquid or paste polymer forms

These complementary documents provide detailed methodologies critical to comprehensive characterization of PVC resins.

Keywords: PVC resin testing, homopolymer vinyl chloride, copolymer vinyl chloride, PVC sample preparation, test methods, plasticizer absorption, viscosity of PVC, ISO 24024-2, vinyl chloride resins properties, polymer standard testing, PVC quality control.