ISO 1269:2006

Overview

ISO 1269:2006 specifies two standardized laboratory methods for the determination of volatile matter (including water) in homopolymer and copolymer resins of vinyl chloride. The standard covers both a conventional oven/balance procedure (Method A) and an automated thermobalance procedure (Method B), defining apparatus, test conditions, calculation and reporting requirements for accurate and reproducible measurement of volatile content in PVC-type resins.

Key Topics and Requirements

• Scope: Applies to homopolymer and copolymer resins of vinyl chloride; measures total volatile matter including moisture.
• Two test methods:
  • Method A (oven + balance):
    • Oven temperature: 110 °C ± 2 °C (105 °C ± 2 °C recommended if thermal degradation is a risk).
    • Use a low, flat weighing dish (~80 mm diameter) with lid; balance accuracy 0.001 g.
    • Preheat dish ~1 h, cool in desiccator; weigh sample (~5 g) and heat with lid removed for 1 h, then further 30 min cycles until mass change ≤ 0.005 g between successive weighings.
  • Method B (automatic thermobalance):
    • Thermobalance with precision balance and IR/halogen heating; oven set at 110 °C ± 2 °C.
    • Sample mass typically 5–15 g on an aluminum dish (~100 mm diameter).
    • Automated end point: mass-loss rate criterion - loss per second beyond 2 min < 0.02 mg.
• Calculation: Percentage volatile matter is calculated from the mass difference before and after heating (formula provided in the standard).
• Reproducibility: Interlaboratory programs reported reproducibility of ±0.10 % (absolute) for both methods.
• Reporting: Test reports must reference ISO 1269:2006, identify the product, state the method used (A or B), temperatures, sample mass and duration (for B), results (to specified precision), and any incidents affecting the result.

Applications and Users

• Who uses it: Plastics manufacturers, QC/analytical laboratories, polymer processors, resin suppliers, testing laboratories and compliance teams.
• Practical value:
  • Ensures consistent specification and acceptance criteria for PVC resins.
  • Detects residual solvents, processing additives or bound water that can affect polymer processing, product performance, and storage stability.
  • Supports quality control, incoming material inspection, product certification and R&D when evaluating resin formulations or processing effects.

Related information

• Developed by ISO/TC 61 (Plastics), SC 9 (Thermoplastic materials).
• ISO 1269:2006 is a technical revision that added Method B (thermobalance) to earlier editions.
• For broader context, laboratories often pair this test with other ISO/ASTM polymer test methods for moisture, ash and volatile organic content.

Keywords: ISO 1269:2006, vinyl chloride resins, volatile matter determination, PVC resins, thermobalance, oven method, moisture content, plastics testing, homopolymer, copolymer.