ISO 1158:2026

Overview

ISO 1158:2026 - Plastics - Vinyl chloride homopolymers and copolymers - Determination of chlorine content defines standardized methods for accurately measuring the chlorine content in vinyl chloride homopolymers and copolymers. Developed by ISO Technical Committee 61 (Plastics), this fourth edition replaces ISO 1158:1998, incorporating technical updates and improved procedural guidance. The standard is applicable to materials free from plasticizers or additives, ensuring precise results for unmodified resins.

Chlorine content determination is a critical step in quality control, regulatory compliance, and material performance evaluation within the plastics industry, especially for manufacturers and laboratories working with polyvinyl chloride (PVC) and its related materials.

Key Topics

• Scope: Specifies procedures for determining chlorine content in vinyl chloride homopolymers and copolymers without plasticizers or additives.
• Test Methods: Offers two established combustion-based methodologies for chlorine content determination:
  • Method A: Combustion in a bomb (such as a Parr bomb), involving sodium peroxide oxidation, suitable for precise laboratory analysis.
  • Method B: Combustion in an oxygen flask, using platinum wire ignition, suited for smaller sample quantities.
• Sample Preparation: Details requirements for sample form, including oven drying and particle size control, to ensure repeatability.
• Reagents and Apparatus: Highlights required purity levels for chemicals and specifications for laboratory equipment, guaranteeing consistent test results.
• Result Expression and Reporting: Provides formulas for calculating chlorine percentage by mass and specifies reporting requirements to ensure transparency and reproducibility.

Applications

ISO 1158:2026 plays a vital role for stakeholders within the plastics industry, including:

• Manufacturers of PVC and Copolymers: Ensures compliance with material specifications by verifying chlorine content, directly influencing product properties like fire resistance, color stability, and chemical durability.
• Quality Control Laboratories: Provides a repeatable, standardized protocol for routine analysis, supporting quality assurance procedures.
• Research and Development: Assists in comparing formulations or process conditions by enabling accurate measurement of chlorine levels in experimental polymer batches.
• Regulatory Compliance: Helps organizations meet international or regional regulatory requirements regarding PVC material composition and safe product use.
• Material Certification: Supports certification processes by providing recognized, traceable test results for chlorine content in vinyl chloride-based plastics.

Related Standards

Organizations referencing ISO 1158:2026 for chlorine content determination or broader plastics characterization may also consider the following standards:

• ISO 3696: Water for analytical laboratory use - Specification and test methods (guidance on water purity for analysis).
• ISO 6353-1: Reagents for chemical analysis - Part 1: General test methods (specifications for laboratory reagents).
• ISO 182: Plastics - General method of analysis for end-use properties of PVC resins.
• ISO 11357 Series: Plastics - Differential scanning calorimetry (DSC) for thermal analysis.
• ISO 1833 Series: Textiles - Quantitative chemical analysis, useful for polymer blends.

Adhering to ISO 1158:2026 increases reliability and comparability of results, fostering international trade and aiding organizations aiming for high standards in vinyl chloride polymer production and processing.

Keywords: ISO 1158, PVC chlorine determination, vinyl chloride polymers, chlorine analysis, plastics testing, quality control in plastics, international standards, PVC copolymers, combustion bomb, oxygen flask method, ISO standards for plastics